From 6c44a511782ef8430f9464c7c6e7ee694be4afb3 Mon Sep 17 00:00:00 2001
From: John Hildenbiddle <john@hildenbiddle.com>
Date: Fri, 26 Jan 2018 00:22:03 -0800
Subject: [PATCH] Initial commit

---
 .eslintrc.js                          |   39 +
 .gitignore                            |   11 +
 .travis.yml                           |   13 +
 CHANGELOG.md                          |    7 +
 LICENSE                               |    2 +-
 dist/css-vars-ponyfill.esm.js         |  979 +++
 dist/css-vars-ponyfill.esm.js.map     |    1 +
 dist/css-vars-ponyfill.esm.min.js     |   16 +
 dist/css-vars-ponyfill.esm.min.js.map |    1 +
 dist/css-vars-ponyfill.js             |  958 +++
 dist/css-vars-ponyfill.js.map         |    1 +
 dist/css-vars-ponyfill.min.js         |   16 +
 dist/css-vars-ponyfill.min.js.map     |    1 +
 karma.conf.js                         |  186 +
 package-lock.json                     | 9160 +++++++++++++++++++++++++
 package.json                          |   80 +
 rollup.config.js                      |  143 +
 saucelabs.config.js                   |    6 +
 src/index.js                          |  249 +
 src/merge-deep.js                     |   36 +
 src/parse-css.js                      |  255 +
 src/stringify-css.js                  |  102 +
 src/transform-css.js                  |  314 +
 tests/.eslintrc.js                    |   20 +
 tests/css-vars.test.js                |  454 ++
 tests/fixtures/test-declaration.css   |    3 +
 tests/fixtures/test-onerror.css       |    1 +
 tests/fixtures/test-parse.css         |  210 +
 tests/fixtures/test-stringify.css     |   96 +
 tests/fixtures/test-value.css         |    3 +
 tests/helpers/load-fixtures.js        |   34 +
 tests/parse-css.test.js               |  130 +
 tests/stringify-css.test.js           |   47 +
 tests/transform-css.test.js           |  326 +
 34 files changed, 13899 insertions(+), 1 deletion(-)
 create mode 100644 .eslintrc.js
 create mode 100644 .gitignore
 create mode 100644 .travis.yml
 create mode 100644 CHANGELOG.md
 create mode 100644 dist/css-vars-ponyfill.esm.js
 create mode 100644 dist/css-vars-ponyfill.esm.js.map
 create mode 100644 dist/css-vars-ponyfill.esm.min.js
 create mode 100644 dist/css-vars-ponyfill.esm.min.js.map
 create mode 100644 dist/css-vars-ponyfill.js
 create mode 100644 dist/css-vars-ponyfill.js.map
 create mode 100644 dist/css-vars-ponyfill.min.js
 create mode 100644 dist/css-vars-ponyfill.min.js.map
 create mode 100644 karma.conf.js
 create mode 100644 package-lock.json
 create mode 100644 package.json
 create mode 100644 rollup.config.js
 create mode 100644 saucelabs.config.js
 create mode 100644 src/index.js
 create mode 100644 src/merge-deep.js
 create mode 100644 src/parse-css.js
 create mode 100644 src/stringify-css.js
 create mode 100644 src/transform-css.js
 create mode 100644 tests/.eslintrc.js
 create mode 100644 tests/css-vars.test.js
 create mode 100644 tests/fixtures/test-declaration.css
 create mode 100644 tests/fixtures/test-onerror.css
 create mode 100644 tests/fixtures/test-parse.css
 create mode 100644 tests/fixtures/test-stringify.css
 create mode 100644 tests/fixtures/test-value.css
 create mode 100644 tests/helpers/load-fixtures.js
 create mode 100644 tests/parse-css.test.js
 create mode 100644 tests/stringify-css.test.js
 create mode 100644 tests/transform-css.test.js

diff --git a/.eslintrc.js b/.eslintrc.js
new file mode 100644
index 0000000..078213f
--- /dev/null
+++ b/.eslintrc.js
@@ -0,0 +1,39 @@
+module.exports = {
+    "env": {
+        "browser" : true,
+        "commonjs": true,
+        "es6"     : true,
+        "node"    : true
+    },
+    "extends": "eslint:recommended",
+    "plugins": [],
+    "parserOptions": {
+        "sourceType" : "module"
+    },
+    "rules": {
+        "array-bracket-spacing"      : ["error", "never"],
+        "array-callback-return"      : ["error"],
+        "block-scoped-var"           : ["error"],
+        "block-spacing"              : ["error", "always"],
+        "curly"                      : ["error"],
+        "dot-notation"               : ["error"],
+        "eqeqeq"                     : ["error"],
+        "indent"                     : ["error", 4],
+        "linebreak-style"            : ["error", "unix"],
+        "no-console"                 : ["warn"],
+        "no-floating-decimal"        : ["error"],
+        "no-implicit-coercion"       : ["error"],
+        "no-implicit-globals"        : ["error"],
+        "no-loop-func"               : ["error"],
+        "no-return-assign"           : ["error"],
+        "no-template-curly-in-string": ["error"],
+        "no-unneeded-ternary"        : ["error"],
+        "no-unused-vars"             : ["error", { "args": "none" }],
+        "no-useless-computed-key"    : ["error"],
+        "no-useless-return"          : ["error"],
+        "no-var"                     : ["error"],
+        "prefer-const"               : ["error"],
+        "quotes"                     : ["error", "single"],
+        "semi"                       : ["error", "always"]
+    }
+};
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4a18cb6
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,11 @@
+# Folders
+coverage
+node_modules
+
+# Files
+*.log
+
+# OS
+._*
+.cache
+.DS_Store
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..4c9ee20
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,13 @@
+language: node_js
+node_js: "stable"
+
+notifications:
+  email: false
+
+before_install:
+  - stty cols 80
+
+script: "npm run test-remote"
+
+after_success:
+  - bash <(curl -s https://codecov.io/bash) -e TRAVIS_NODE_VERSION
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..28bcc51
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,7 @@
+# Change Log
+
+## 1.0.0 - 2017-11-26
+
+**Added**
+
+- Initial release
diff --git a/LICENSE b/LICENSE
index cdce62f..51e689f 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2017 John Hildenbiddle
+Copyright (c) 2018 John Hildenbiddle
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/dist/css-vars-ponyfill.esm.js b/dist/css-vars-ponyfill.esm.js
new file mode 100644
index 0000000..d77d379
--- /dev/null
+++ b/dist/css-vars-ponyfill.esm.js
@@ -0,0 +1,979 @@
+/*!
+ * css-vars-ponyfill
+ * v0.0.1
+ * https://github.com/jhildenbiddle/css-vars-ponyfill
+ * (c) 2018 John Hildenbiddle <http://hildenbiddle.com>
+ * MIT license
+ */
+/*!
+ * get-css-data
+ * v1.1.1
+ * https://github.com/jhildenbiddle/get-css-data
+ * (c) 2018 John Hildenbiddle <http://hildenbiddle.com>
+ * MIT license
+ */
+function getUrls(urls) {
+    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
+    var settings = {
+        mimeType: options.mimeType || null,
+        onComplete: options.onComplete || Function.prototype,
+        onError: options.onError || Function.prototype,
+        onSuccess: options.onSuccess || Function.prototype
+    };
+    var urlArray = Array.isArray(urls) ? urls : [ urls ];
+    var urlQueue = Array.apply(null, Array(urlArray.length)).map(function(x) {
+        return null;
+    });
+    function onError(xhr, urlIndex) {
+        settings.onError(xhr, urlArray[urlIndex], urlIndex);
+    }
+    function onSuccess(responseText, urlIndex) {
+        urlQueue[urlIndex] = responseText;
+        settings.onSuccess(responseText, urlArray[urlIndex], urlIndex);
+        if (urlQueue.indexOf(null) === -1) {
+            settings.onComplete(urlQueue);
+        }
+    }
+    urlArray.forEach(function(url, i) {
+        var parser = document.createElement("a");
+        parser.setAttribute("href", url);
+        parser.href = parser.href;
+        var isCrossDomain = parser.host !== location.host;
+        var isSameProtocol = parser.protocol === location.protocol;
+        if (isCrossDomain && typeof XDomainRequest !== "undefined") {
+            if (isSameProtocol) {
+                var xdr = new XDomainRequest();
+                xdr.open("GET", url);
+                xdr.timeout = 0;
+                xdr.onprogress = Function.prototype;
+                xdr.ontimeout = Function.prototype;
+                xdr.onload = function() {
+                    onSuccess(xdr.responseText, i);
+                };
+                xdr.onerror = function(err) {
+                    onError(xdr, i);
+                };
+                setTimeout(function() {
+                    xdr.send();
+                }, 0);
+            } else {
+                console.log("Internet Explorer 9 Cross-Origin (CORS) requests must use the same protocol");
+                onError(null, i);
+            }
+        } else {
+            var xhr = new XMLHttpRequest();
+            xhr.open("GET", url);
+            if (settings.mimeType && xhr.overrideMimeType) {
+                xhr.overrideMimeType(settings.mimeType);
+            }
+            xhr.onreadystatechange = function() {
+                if (xhr.readyState === 4) {
+                    if (xhr.status === 200) {
+                        onSuccess(xhr.responseText, i);
+                    } else {
+                        onError(xhr, i);
+                    }
+                }
+            };
+            xhr.send();
+        }
+    });
+}
+
+/**
+ * Gets CSS data from <style> and <link> nodes (including @imports), then
+ * returns data in order processed by DOM. Allows specifying nodes to
+ * include/exclude and filtering CSS data using RegEx.
+ *
+ * @preserve
+ * @param {object} [options={}] - The options object
+ * @param {string} options.include - CSS selector matching <link> and <style>
+ * nodes to include
+ * @param {string} options.exclude - CSS selector matching <link> and <style>
+ * nodes to exclude
+ * @param {object} options.filter - Regular expression used to filter node CSS
+ * data. Each block of CSS data is tested against the filter, and only matching
+ * data is included.
+ * @param {function} options.onComplete - Callback after all nodes have been
+ * processed. Passes 1) concatenated CSS text, 2) an array of CSS text in DOM
+ * order, and 3) an array of nodes in DOM order as arguments.
+ * @param {function} options.onError - Callback on each error. Passes 1) the XHR
+ * object for inspection, 2) soure node reference, and 3) the source URL that
+ * failed (either a <link> href or an @import) as arguments
+ * @param {function} options.onSuccess - Callback on each CSS node read. Passes
+ * 1) CSS text, 2) source node reference, and 3) the source URL (either a <link>
+ *    href or an import) as arguments.
+ * @example
+ *
+ *   getCssData({
+ *     include: 'style,link[rel="stylesheet"]', // default
+ *     exclude: '[href="skip.css"]',
+ *     filter : /red/,
+ *     onComplete(cssText, cssArray) {
+ *       // ...
+ *     },
+ *     onError(xhr, node, url) {
+ *       // ...
+ *     },
+ *     onSuccess(cssText, node, url) {
+ *       // ...
+ *     }
+ *   });
+ */ function getCssData(options) {
+    var regex = {
+        cssComments: /\/\*[\s\S]+?\*\//g,
+        cssImports: /(?:@import\s*)(?:url\(\s*)?(?:['"])([^'"]*)(?:['"])(?:\s*\))?(?:[^;]*;)/g
+    };
+    var settings = {
+        include: options.include || 'style,link[rel="stylesheet"]',
+        exclude: options.exclude || null,
+        filter: options.filter || null,
+        onComplete: options.onComplete || Function.prototype,
+        onError: options.onError || Function.prototype,
+        onSuccess: options.onSuccess || Function.prototype
+    };
+    var sourceNodes = Array.apply(null, document.querySelectorAll(settings.include)).filter(function(node) {
+        return !matchesSelector(node, settings.exclude);
+    });
+    var cssArray = Array.apply(null, Array(sourceNodes.length)).map(function(x) {
+        return null;
+    });
+    function handleComplete() {
+        var isComplete = cssArray.indexOf(null) === -1;
+        if (isComplete) {
+            var cssText = cssArray.join("");
+            settings.onComplete(cssText, cssArray, sourceNodes);
+        }
+    }
+    function handleError(xhr, node, url, cssIndex) {
+        var cssText = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : "";
+        cssArray[cssIndex] = cssText;
+        settings.onError(xhr, node, url);
+        handleComplete();
+    }
+    function handleSuccess(cssText, cssIndex, node, sourceUrl, importUrl) {
+        if (!settings.filter || settings.filter.test(cssText)) {
+            var returnVal = settings.onSuccess(cssText, node, importUrl || sourceUrl);
+            cssText = returnVal === false ? "" : returnVal || cssText;
+            var importRules = cssText.replace(regex.cssComments, "").match(regex.cssImports);
+            if (importRules) {
+                var importUrls = importRules.map(function(decl) {
+                    return decl.replace(regex.cssImports, "$1");
+                });
+                importUrls = importUrls.map(function(url) {
+                    return getFullUrl(url, sourceUrl);
+                });
+                getUrls(importUrls, {
+                    onError: function onError(xhr, url, urlIndex) {
+                        handleError(xhr, node, url, cssIndex, cssText);
+                    },
+                    onSuccess: function onSuccess(importText, url, urlIndex) {
+                        var importDecl = importRules[urlIndex];
+                        var importUrl = importUrls[urlIndex];
+                        var newCssText = cssText.replace(importDecl, importText);
+                        handleSuccess(newCssText, cssIndex, node, url, importUrl);
+                    }
+                });
+            } else {
+                cssArray[cssIndex] = cssText;
+                handleComplete();
+            }
+        } else {
+            cssArray[cssIndex] = "";
+            handleComplete();
+        }
+    }
+    if (sourceNodes.length) {
+        sourceNodes.forEach(function(node, i) {
+            var linkHref = node.getAttribute("href");
+            var linkRel = node.getAttribute("rel");
+            var isLink = node.nodeName === "LINK" && linkHref && linkRel && linkRel.toLowerCase() === "stylesheet";
+            var isStyle = node.nodeName === "STYLE";
+            if (isLink) {
+                getUrls(linkHref, {
+                    mimeType: "text/css",
+                    onError: function onError(xhr, url, urlIndex) {
+                        handleError(xhr, node, url, i);
+                    },
+                    onSuccess: function onSuccess(cssText, url, urlIndex) {
+                        var sourceUrl = getFullUrl(linkHref, location.href);
+                        handleSuccess(cssText, i, node, sourceUrl);
+                    }
+                });
+            } else if (isStyle) {
+                handleSuccess(node.textContent, i, node, location.href);
+            } else {
+                cssArray[i] = "";
+                handleComplete();
+            }
+        });
+    } else {
+        settings.onComplete("", []);
+    }
+}
+
+function getFullUrl(url) {
+    var base = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : location.href;
+    var d = document.implementation.createHTMLDocument("");
+    var b = d.createElement("base");
+    var a = d.createElement("a");
+    d.head.appendChild(b);
+    d.body.appendChild(a);
+    b.href = base;
+    a.href = url;
+    return a.href;
+}
+
+function matchesSelector(elm, selector) {
+    var matches = elm.matches || elm.matchesSelector || elm.webkitMatchesSelector || elm.mozMatchesSelector || elm.msMatchesSelector || elm.oMatchesSelector;
+    return matches.call(elm, selector);
+}
+
+function mergeDeep() {
+    var isObject = function isObject(obj) {
+        return obj instanceof Object && obj.constructor === Object;
+    };
+    for (var _len = arguments.length, objects = Array(_len), _key = 0; _key < _len; _key++) {
+        objects[_key] = arguments[_key];
+    }
+    return objects.reduce(function(prev, obj) {
+        Object.keys(obj).forEach(function(key) {
+            var pVal = prev[key];
+            var oVal = obj[key];
+            if (isObject(pVal) && isObject(oVal)) {
+                prev[key] = mergeDeep(pVal, oVal);
+            } else {
+                prev[key] = oVal;
+            }
+        });
+        return prev;
+    }, {});
+}
+
+var balancedMatch = balanced;
+
+function balanced(a, b, str) {
+    if (a instanceof RegExp) a = maybeMatch(a, str);
+    if (b instanceof RegExp) b = maybeMatch(b, str);
+    var r = range(a, b, str);
+    return r && {
+        start: r[0],
+        end: r[1],
+        pre: str.slice(0, r[0]),
+        body: str.slice(r[0] + a.length, r[1]),
+        post: str.slice(r[1] + b.length)
+    };
+}
+
+function maybeMatch(reg, str) {
+    var m = str.match(reg);
+    return m ? m[0] : null;
+}
+
+balanced.range = range;
+
+function range(a, b, str) {
+    var begs, beg, left, right, result;
+    var ai = str.indexOf(a);
+    var bi = str.indexOf(b, ai + 1);
+    var i = ai;
+    if (ai >= 0 && bi > 0) {
+        begs = [];
+        left = str.length;
+        while (i >= 0 && !result) {
+            if (i == ai) {
+                begs.push(i);
+                ai = str.indexOf(a, i + 1);
+            } else if (begs.length == 1) {
+                result = [ begs.pop(), bi ];
+            } else {
+                beg = begs.pop();
+                if (beg < left) {
+                    left = beg;
+                    right = bi;
+                }
+                bi = str.indexOf(b, i + 1);
+            }
+            i = ai < bi && ai >= 0 ? ai : bi;
+        }
+        if (begs.length) {
+            result = [ left, right ];
+        }
+    }
+    return result;
+}
+
+function cssParse(css) {
+    var errors = [];
+    function error(msg) {
+        throw new Error("CSS parse error: " + msg);
+    }
+    function match(re) {
+        var m = re.exec(css);
+        if (m) {
+            css = css.slice(m[0].length);
+            return m;
+        }
+    }
+    function whitespace() {
+        match(/^\s*/);
+    }
+    function open() {
+        return match(/^{\s*/);
+    }
+    function close() {
+        return match(/^}/);
+    }
+    function comment() {
+        whitespace();
+        if (css[0] !== "/" || css[1] !== "*") {
+            return;
+        }
+        var i = 2;
+        while (css[i] && (css[i] !== "*" || css[i + 1] !== "/")) {
+            i++;
+        }
+        if (!css[i]) {
+            return error("end of comment is missing");
+        }
+        var str = css.slice(2, i);
+        css = css.slice(i + 2);
+        return {
+            type: "comment",
+            comment: str
+        };
+    }
+    function comments() {
+        var cmnts = [];
+        var c = void 0;
+        while (c = comment()) {
+            cmnts.push(c);
+        }
+        return cmnts;
+    }
+    function selector() {
+        whitespace();
+        while (css[0] === "}") {
+            error("extra closing bracket");
+        }
+        var m = match(/^(("(?:\\"|[^"])*"|'(?:\\'|[^'])*'|[^{])+)/);
+        if (m) {
+            return m[0].trim().replace(/\/\*([^*]|[\r\n]|(\*+([^*/]|[\r\n])))*\*\/+/g, "").replace(/"(?:\\"|[^"])*"|'(?:\\'|[^'])*'/g, function(m) {
+                return m.replace(/,/g, "‌");
+            }).split(/\s*(?![^(]*\)),\s*/).map(function(s) {
+                return s.replace(/\u200C/g, ",");
+            });
+        }
+    }
+    function declaration() {
+        match(/^([;\s]*)+/);
+        var comment_regexp = /\/\*[^*]*\*+([^/*][^*]*\*+)*\//g;
+        var prop = match(/^(\*?[-#/*\\\w]+(\[[0-9a-z_-]+\])?)\s*/);
+        if (!prop) {
+            return;
+        }
+        prop = prop[0].trim();
+        if (!match(/^:\s*/)) {
+            return error("property missing ':'");
+        }
+        var val = match(/^((?:\/\*.*?\*\/|'(?:\\'|.)*?'|"(?:\\"|.)*?"|\((\s*'(?:\\'|.)*?'|"(?:\\"|.)*?"|[^)]*?)\s*\)|[^};])+)/);
+        var ret = {
+            type: "declaration",
+            property: prop.replace(comment_regexp, ""),
+            value: val ? val[0].replace(comment_regexp, "").trim() : ""
+        };
+        match(/^[;\s]*/);
+        return ret;
+    }
+    function declarations() {
+        if (!open()) {
+            return error("missing '{'");
+        }
+        var d = void 0, decls = comments();
+        while (d = declaration()) {
+            decls.push(d);
+            decls = decls.concat(comments());
+        }
+        if (!close()) {
+            return error("missing '}'");
+        }
+        return decls;
+    }
+    function keyframe() {
+        whitespace();
+        var vals = [];
+        var m = void 0;
+        while (m = match(/^((\d+\.\d+|\.\d+|\d+)%?|[a-z]+)\s*/)) {
+            vals.push(m[1]);
+            match(/^,\s*/);
+        }
+        if (vals.length) {
+            return {
+                type: "keyframe",
+                values: vals,
+                declarations: declarations()
+            };
+        }
+    }
+    function at_keyframes() {
+        var m = match(/^@([-\w]+)?keyframes\s*/);
+        if (!m) {
+            return;
+        }
+        var vendor = m[1];
+        m = match(/^([-\w]+)\s*/);
+        if (!m) {
+            return error("@keyframes missing name");
+        }
+        var name = m[1];
+        if (!open()) {
+            return error("@keyframes missing '{'");
+        }
+        var frame = void 0, frames = comments();
+        while (frame = keyframe()) {
+            frames.push(frame);
+            frames = frames.concat(comments());
+        }
+        if (!close()) {
+            return error("@keyframes missing '}'");
+        }
+        return {
+            type: "keyframes",
+            name: name,
+            vendor: vendor,
+            keyframes: frames
+        };
+    }
+    function at_page() {
+        var m = match(/^@page */);
+        if (m) {
+            var sel = selector() || [];
+            return {
+                type: "page",
+                selectors: sel,
+                declarations: declarations()
+            };
+        }
+    }
+    function at_fontface() {
+        var m = match(/^@font-face\s*/);
+        if (m) {
+            return {
+                type: "font-face",
+                declarations: declarations()
+            };
+        }
+    }
+    function at_supports() {
+        var m = match(/^@supports *([^{]+)/);
+        if (m) {
+            return {
+                type: "supports",
+                supports: m[1].trim(),
+                rules: rules()
+            };
+        }
+    }
+    function at_host() {
+        var m = match(/^@host\s*/);
+        if (m) {
+            return {
+                type: "host",
+                rules: rules()
+            };
+        }
+    }
+    function at_media() {
+        var m = match(/^@media *([^{]+)/);
+        if (m) {
+            return {
+                type: "media",
+                media: m[1].trim(),
+                rules: rules()
+            };
+        }
+    }
+    function at_custom_m() {
+        var m = match(/^@custom-media\s+(--[^\s]+)\s*([^{;]+);/);
+        if (m) {
+            return {
+                type: "custom-media",
+                name: m[1].trim(),
+                media: m[2].trim()
+            };
+        }
+    }
+    function at_document() {
+        var m = match(/^@([-\w]+)?document *([^{]+)/);
+        if (m) {
+            return {
+                type: "document",
+                document: m[2].trim(),
+                vendor: m[1] ? m[1].trim() : null,
+                rules: rules()
+            };
+        }
+    }
+    function at_x() {
+        var m = match(/^@(import|charset|namespace)\s*([^;]+);/);
+        if (m) {
+            return {
+                type: m[1],
+                name: m[2].trim()
+            };
+        }
+    }
+    function at_rule() {
+        whitespace();
+        if (css[0] === "@") {
+            return at_keyframes() || at_supports() || at_host() || at_media() || at_custom_m() || at_page() || at_document() || at_fontface() || at_x();
+        }
+    }
+    function rule() {
+        var sel = selector() || [];
+        if (!sel.length) {
+            error("selector missing");
+        }
+        var decls = declarations();
+        return {
+            type: "rule",
+            selectors: sel,
+            declarations: decls
+        };
+    }
+    function rules(core) {
+        if (!core && !open()) {
+            return error("missing '{'");
+        }
+        var node = void 0, rules = comments();
+        while (css.length && (core || css[0] !== "}") && (node = at_rule() || rule())) {
+            rules.push(node);
+            rules = rules.concat(comments());
+        }
+        if (!core && !close()) {
+            return error("missing '}'");
+        }
+        return rules;
+    }
+    return {
+        type: "stylesheet",
+        stylesheet: {
+            rules: rules(true),
+            errors: errors
+        }
+    };
+}
+
+function stringifyCss(tree) {
+    var delim = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : "";
+    var cb = arguments[2];
+    var renderMethods = {
+        charset: function charset(node) {
+            return "@charset " + node.name + ";";
+        },
+        comment: function comment(node) {
+            return "";
+        },
+        "custom-media": function customMedia(node) {
+            return "@custom-media " + node.name + " " + node.media + ";";
+        },
+        declaration: function declaration(node) {
+            return node.property + ":" + node.value + ";";
+        },
+        document: function document(node) {
+            return "@" + (node.vendor || "") + "document " + node.document + "{" + visit(node.rules) + "}";
+        },
+        "font-face": function fontFace(node) {
+            return "@font-face" + "{" + visit(node.declarations) + "}";
+        },
+        host: function host(node) {
+            return "@host" + "{" + visit(node.rules) + "}";
+        },
+        import: function _import(node) {
+            return "@import " + node.name + ";";
+        },
+        keyframe: function keyframe(node) {
+            return node.values.join(",") + "{" + visit(node.declarations) + "}";
+        },
+        keyframes: function keyframes(node) {
+            return "@" + (node.vendor || "") + "keyframes " + node.name + "{" + visit(node.keyframes) + "}";
+        },
+        media: function media(node) {
+            return "@media " + node.media + "{" + visit(node.rules) + "}";
+        },
+        namespace: function namespace(node) {
+            return "@namespace " + node.name + ";";
+        },
+        page: function page(node) {
+            return "@page " + (node.selectors.length ? node.selectors.join(", ") : "") + "{" + visit(node.declarations) + "}";
+        },
+        rule: function rule(node) {
+            var decls = node.declarations;
+            if (decls.length) {
+                return node.selectors.join(",") + "{" + visit(decls) + "}";
+            }
+        },
+        supports: function supports(node) {
+            return "@supports " + node.supports + "{" + visit(node.rules) + "}";
+        }
+    };
+    function visit(nodes) {
+        var buf = "";
+        for (var i = 0; i < nodes.length; i++) {
+            var n = nodes[i];
+            if (cb) {
+                cb(n);
+            }
+            var txt = renderMethods[n.type](n);
+            if (txt) {
+                buf += txt;
+                if (txt.length && n.selectors) {
+                    buf += delim;
+                }
+            }
+        }
+        return buf;
+    }
+    return visit(tree.stylesheet.rules);
+}
+
+var VAR_PROP_IDENTIFIER = "--";
+
+var VAR_FUNC_IDENTIFIER = "var";
+
+var reVarProp = /^--/;
+
+var reVarVal = /^var(.*)/;
+
+function transformVars(cssText) {
+    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
+    var defaults = {
+        onlyVars: true,
+        preserve: true,
+        variables: {},
+        onWarning: function onWarning() {}
+    };
+    var map = {};
+    var settings = mergeDeep(defaults, options);
+    var cssTree = cssParse(cssText);
+    if (settings.onlyVars) {
+        cssTree.stylesheet.rules = filterVars(cssTree.stylesheet.rules);
+    }
+    cssTree.stylesheet.rules.forEach(function(rule) {
+        var varNameIndices = [];
+        if (rule.type !== "rule") {
+            return;
+        }
+        if (rule.selectors.length !== 1 || rule.selectors[0] !== ":root") {
+            return;
+        }
+        rule.declarations.forEach(function(decl, i) {
+            var prop = decl.property;
+            var value = decl.value;
+            if (prop && prop.indexOf(VAR_PROP_IDENTIFIER) === 0) {
+                map[prop] = value;
+                varNameIndices.push(i);
+            }
+        });
+        if (!settings.preserve) {
+            for (var i = varNameIndices.length - 1; i >= 0; i--) {
+                rule.declarations.splice(varNameIndices[i], 1);
+            }
+        }
+    });
+    if (Object.keys(settings.variables).length) {
+        var newRule = {
+            declarations: [],
+            selectors: [ ":root" ],
+            type: "rule"
+        };
+        Object.keys(settings.variables).forEach(function(key) {
+            var varName = "--" + key.replace(/^-+/, "");
+            var varValue = settings.variables[key];
+            map[varName] = varValue;
+            newRule.declarations.push({
+                type: "declaration",
+                property: varName,
+                value: varValue
+            });
+        });
+        if (settings.preserve) {
+            cssTree.stylesheet.rules.push(newRule);
+        }
+    }
+    walkCss(cssTree.stylesheet, function(declarations, node) {
+        var decl = void 0;
+        var resolvedValue = void 0;
+        var value = void 0;
+        for (var i = 0; i < declarations.length; i++) {
+            decl = declarations[i];
+            value = decl.value;
+            if (decl.type !== "declaration") {
+                continue;
+            }
+            if (!value || value.indexOf(VAR_FUNC_IDENTIFIER + "(") === -1) {
+                continue;
+            }
+            resolvedValue = resolveValue(value, map, settings);
+            if (resolvedValue !== "undefined") {
+                if (!settings.preserve) {
+                    decl.value = resolvedValue;
+                } else {
+                    declarations.splice(i, 0, {
+                        type: decl.type,
+                        property: decl.property,
+                        value: resolvedValue
+                    });
+                    i++;
+                }
+            }
+        }
+    });
+    return stringifyCss(cssTree);
+}
+
+function filterVars(rules) {
+    return rules.filter(function(rule) {
+        if (rule.declarations) {
+            var declArray = rule.type === "font-face" ? [] : rule.declarations;
+            declArray = rule.declarations.filter(function(d) {
+                return reVarProp.test(d.property) || reVarVal.test(d.value);
+            });
+            return Boolean(declArray.length);
+        } else if (rule.keyframes) {
+            return Boolean(rule.keyframes.filter(function(k) {
+                return Boolean(k.declarations.filter(function(d) {
+                    return reVarProp.test(d.property) || reVarVal.test(d.value);
+                }).length);
+            }).length);
+        } else if (rule.rules) {
+            rule.rules = filterVars(rule.rules).filter(function(r) {
+                return r.declarations.length;
+            });
+            return Boolean(rule.rules.length);
+        }
+        return true;
+    });
+}
+
+function resolveValue(value, map, settings) {
+    var RE_VAR = /([\w-]+)(?:\s*,\s*)?(.*)?/;
+    var balancedParens = balancedMatch("(", ")", value);
+    var varStartIndex = value.indexOf("var(");
+    var varRef = balancedMatch("(", ")", value.substring(varStartIndex)).body;
+    var warningIntro = "CSS transform warning:";
+    if (!balancedParens) {
+        settings.onWarning(warningIntro + ' missing closing ")" in the value "' + value + '"');
+    }
+    if (varRef === "") {
+        settings.onWarning(warningIntro + " var() must contain a non-whitespace string");
+    }
+    var varFunc = VAR_FUNC_IDENTIFIER + "(" + varRef + ")";
+    var varResult = varRef.replace(RE_VAR, function(_, name, fallback) {
+        var replacement = map[name];
+        if (!replacement && !fallback) {
+            settings.onWarning(warningIntro + ' variable "' + name + '" is undefined');
+        }
+        if (!replacement && fallback) {
+            return fallback;
+        }
+        return replacement;
+    });
+    value = value.split(varFunc).join(varResult);
+    if (value.indexOf(VAR_FUNC_IDENTIFIER) !== -1) {
+        value = resolveValue(value, map, settings);
+    }
+    return value;
+}
+
+function walkCss(node, fn) {
+    node.rules.forEach(function(rule) {
+        if (rule.rules) {
+            walkCss(rule, fn);
+            return;
+        }
+        if (rule.keyframes) {
+            rule.keyframes.forEach(function(keyframe) {
+                if (keyframe.type === "keyframe") {
+                    fn(keyframe.declarations, rule);
+                }
+            });
+            return;
+        }
+        if (!rule.declarations) {
+            return;
+        }
+        fn(rule.declarations, node);
+    });
+}
+
+var name = "css-vars-ponyfill";
+
+var defaults = {
+    include: "style,link[rel=stylesheet]",
+    exclude: "",
+    appendStyle: true,
+    onlyLegacy: true,
+    onlyVars: true,
+    preserve: true,
+    silent: false,
+    variables: {},
+    onSuccess: function onSuccess() {},
+    onError: function onError() {},
+    onWarning: function onWarning() {},
+    onComplete: function onComplete() {}
+};
+
+var reCssVars = /(?:(?::root\s*{\s*[^;]*;*\s*)|(?:var\(\s*))(--[^:)]+)(?:\s*[:)])/;
+
+/**
+ * Description
+ *
+ * @preserve
+ * @param {object}   [options] Options object
+ * @param {string}   [options.include="style,link[rel=stylesheet]"] CSS selector
+ *                   matching <link> and <style> nodes to include
+ * @param {string}   [options.exclude=""] CSS selector matching <link> and
+ *                   <style> nodes to exclude
+ * @param {boolean}  [options.appendStyle=true] Append <style> node containing
+ *                   updated CSS to DOM
+ * @param {boolean}  [options.onlyLegacy=true] Only process CSS variables in
+ *                   browsers that lack native support
+ * @param {boolean}  [options.onlyVars=true] Remove declarations that do not
+ *                   contain a CSS variable from the return value. Note that
+ *                   font-face and keyframe rules require all declarations to be
+ *                   returned if a CSS variable is used.
+ * @param {boolean}  [options.preserve=true] Preserve CSS variable definitions
+ *                   and functions in the return value, allowing "live" variable
+ *                   updates via JavaScript to continue working in browsers with
+ *                   native CSS variable support.
+ * @param {boolean}  [options.silent=false] Prevent console warnign and error
+ *                   messages
+ * @param {object}   [options.variables={}] CSS variable definitions to include
+ *                   during transformation. Can be used to add new override
+ *                   exisitng definitions.
+ * @param {function} [options.onSuccess] Callback after all stylesheets have
+ *                   been processed succesfully. Passes 1) a CSS string with CSS
+ *                   variable values resolved as an argument. Modifying the CSS
+ *                   appended when 'appendStyle' is 'true' can be done by
+ *                   returning a string value from this funtion (or 'false' to
+ *                   skip).
+ * @param {function} [options.onError] Callback on each error. Passes 1) an
+ *                   error message, and 2) source node reference as arguments.
+ * @param {function} [options.onWarning] Callback on each warning. Passes 1) a
+ *                   warning message as an argument.
+ * @param {function} [options.onComplete] Callback after all stylesheets have
+ *                   been processed succesfully and <style> node containing
+ *                   updated CSS has been appended to the DOM (based on
+ *                   'appendStyle' setting. Passes 1) a CSS string with CSS
+ *                   variable values resolved, and 2) a reference to the
+ *                   appended <style> node.
+ *
+ * @example
+ *
+ *   cssVars({
+ *     include    : 'style,link[rel="stylesheet"]', // default
+ *     exclude    : '',
+ *     appendStyle: true, // default
+ *     onlyLegacy : true, // default
+ *     onlyVars   : true, // default
+ *     preserve   : true, // default
+ *     silent     : false, // default
+ *     onError(message, node) {
+ *       // ...
+ *     },
+ *     onWarning(message) {
+ *       // ...
+ *     },
+ *     onSuccess(cssText) {
+ *       // ...
+ *     },
+ *     onComplete(cssText, styleNode) {
+ *       // ...
+ *     }
+ *   });
+ */ function cssVars() {
+    var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
+    var settings = mergeDeep(defaults, options);
+    function handleError(message, sourceNode) {
+        if (!settings.silent) {
+            console.error(message + "\n", sourceNode);
+        }
+        settings.onError(message, sourceNode);
+    }
+    function handleWarning(message) {
+        if (!settings.silent) {
+            console.warn(message);
+        }
+        settings.onWarning(message);
+    }
+    if (document.readyState !== "loading") {
+        var hasNativeSupport = window.CSS && window.CSS.supports && window.CSS.supports("(--a: 0)");
+        if (!hasNativeSupport || !settings.onlyLegacy) {
+            var styleNodeId = name;
+            getCssData({
+                include: settings.include,
+                exclude: "#" + styleNodeId + (settings.exclude ? "," + settings.exclude : ""),
+                filter: settings.onlyVars ? reCssVars : null,
+                onComplete: function onComplete(cssText, cssArray, nodeArray) {
+                    var styleNode = null;
+                    try {
+                        cssText = transformVars(cssText, {
+                            onlyVars: settings.onlyVars,
+                            preserve: settings.preserve,
+                            variables: settings.variables,
+                            onWarning: handleWarning
+                        });
+                        var returnVal = settings.onSuccess(cssText);
+                        cssText = returnVal === false ? "" : returnVal || cssText;
+                        if (settings.appendStyle) {
+                            styleNode = document.querySelector("#" + styleNodeId) || document.createElement("style");
+                            styleNode.setAttribute("id", styleNodeId);
+                            if (styleNode.textContent !== cssText) {
+                                styleNode.textContent = cssText;
+                            }
+                            var styleTargetNode = document.querySelector("body link[rel=stylesheet], body style:not(#" + styleNodeId + ")") ? document.body : document.head;
+                            var isNewTarget = styleNode.parentNode !== styleTargetNode;
+                            var isLastStyleElm = matchesSelector$1(styleNode, "style:last-of-type");
+                            if (isNewTarget || !isLastStyleElm) {
+                                styleTargetNode.appendChild(styleNode);
+                            }
+                        }
+                    } catch (err) {
+                        var errorThrown = false;
+                        cssArray.forEach(function(cssText, i) {
+                            try {
+                                cssText = transformVars(cssText, settings);
+                            } catch (err) {
+                                var errorNode = nodeArray[i - 0];
+                                errorThrown = true;
+                                handleError(err.message, errorNode);
+                            }
+                        });
+                        if (!errorThrown) {
+                            handleError(err.message || err);
+                        }
+                    }
+                    settings.onComplete(cssText, styleNode);
+                },
+                onError: function onError(xhr, node, url) {
+                    var errorMsg = "Unable to process " + url + " (" + xhr.status + " - " + xhr.statusText + "}";
+                    handleError(errorMsg, node);
+                }
+            });
+        }
+    } else {
+        document.addEventListener("DOMContentLoaded", function init(evt) {
+            cssVars(options);
+            document.removeEventListener("DOMContentLoaded", init);
+        });
+    }
+}
+
+function matchesSelector$1(elm, selector) {
+    var matches = elm.matches || elm.matchesSelector || elm.webkitMatchesSelector || elm.mozMatchesSelector || elm.msMatchesSelector || elm.oMatchesSelector;
+    return matches.call(elm, selector);
+}
+
+export default cssVars;
+//# sourceMappingURL=css-vars-ponyfill.esm.js.map
diff --git a/dist/css-vars-ponyfill.esm.js.map b/dist/css-vars-ponyfill.esm.js.map
new file mode 100644
index 0000000..705cfd5
--- /dev/null
+++ b/dist/css-vars-ponyfill.esm.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"css-vars-ponyfill.esm.js","sources":["../node_modules/get-css-data/dist/get-css-data.esm.js","../src/merge-deep.js","../node_modules/balanced-match/index.js","../src/parse-css.js","../src/stringify-css.js","../src/transform-css.js","../src/index.js"],"sourcesContent":["/*!\n * get-css-data\n * v1.1.1\n * https://github.com/jhildenbiddle/get-css-data\n * (c) 2018 John Hildenbiddle <http://hildenbiddle.com>\n * MIT license\n */\nfunction getUrls(urls) {\n    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};\n    var settings = {\n        mimeType: options.mimeType || null,\n        onComplete: options.onComplete || Function.prototype,\n        onError: options.onError || Function.prototype,\n        onSuccess: options.onSuccess || Function.prototype\n    };\n    var urlArray = Array.isArray(urls) ? urls : [ urls ];\n    var urlQueue = Array.apply(null, Array(urlArray.length)).map(function(x) {\n        return null;\n    });\n    function onError(xhr, urlIndex) {\n        settings.onError(xhr, urlArray[urlIndex], urlIndex);\n    }\n    function onSuccess(responseText, urlIndex) {\n        urlQueue[urlIndex] = responseText;\n        settings.onSuccess(responseText, urlArray[urlIndex], urlIndex);\n        if (urlQueue.indexOf(null) === -1) {\n            settings.onComplete(urlQueue);\n        }\n    }\n    urlArray.forEach(function(url, i) {\n        var parser = document.createElement(\"a\");\n        parser.setAttribute(\"href\", url);\n        parser.href = parser.href;\n        var isCrossDomain = parser.host !== location.host;\n        var isSameProtocol = parser.protocol === location.protocol;\n        if (isCrossDomain && typeof XDomainRequest !== \"undefined\") {\n            if (isSameProtocol) {\n                var xdr = new XDomainRequest();\n                xdr.open(\"GET\", url);\n                xdr.timeout = 0;\n                xdr.onprogress = Function.prototype;\n                xdr.ontimeout = Function.prototype;\n                xdr.onload = function() {\n                    onSuccess(xdr.responseText, i);\n                };\n                xdr.onerror = function(err) {\n                    onError(xdr, i);\n                };\n                setTimeout(function() {\n                    xdr.send();\n                }, 0);\n            } else {\n                console.log(\"Internet Explorer 9 Cross-Origin (CORS) requests must use the same protocol\");\n                onError(null, i);\n            }\n        } else {\n            var xhr = new XMLHttpRequest();\n            xhr.open(\"GET\", url);\n            if (settings.mimeType && xhr.overrideMimeType) {\n                xhr.overrideMimeType(settings.mimeType);\n            }\n            xhr.onreadystatechange = function() {\n                if (xhr.readyState === 4) {\n                    if (xhr.status === 200) {\n                        onSuccess(xhr.responseText, i);\n                    } else {\n                        onError(xhr, i);\n                    }\n                }\n            };\n            xhr.send();\n        }\n    });\n}\n\n/**\n * Gets CSS data from <style> and <link> nodes (including @imports), then\n * returns data in order processed by DOM. Allows specifying nodes to\n * include/exclude and filtering CSS data using RegEx.\n *\n * @preserve\n * @param {object} [options={}] - The options object\n * @param {string} options.include - CSS selector matching <link> and <style>\n * nodes to include\n * @param {string} options.exclude - CSS selector matching <link> and <style>\n * nodes to exclude\n * @param {object} options.filter - Regular expression used to filter node CSS\n * data. Each block of CSS data is tested against the filter, and only matching\n * data is included.\n * @param {function} options.onComplete - Callback after all nodes have been\n * processed. Passes 1) concatenated CSS text, 2) an array of CSS text in DOM\n * order, and 3) an array of nodes in DOM order as arguments.\n * @param {function} options.onError - Callback on each error. Passes 1) the XHR\n * object for inspection, 2) soure node reference, and 3) the source URL that\n * failed (either a <link> href or an @import) as arguments\n * @param {function} options.onSuccess - Callback on each CSS node read. Passes\n * 1) CSS text, 2) source node reference, and 3) the source URL (either a <link>\n *    href or an import) as arguments.\n * @example\n *\n *   getCssData({\n *     include: 'style,link[rel=\"stylesheet\"]', // default\n *     exclude: '[href=\"skip.css\"]',\n *     filter : /red/,\n *     onComplete(cssText, cssArray) {\n *       // ...\n *     },\n *     onError(xhr, node, url) {\n *       // ...\n *     },\n *     onSuccess(cssText, node, url) {\n *       // ...\n *     }\n *   });\n */ function getCssData(options) {\n    var regex = {\n        cssComments: /\\/\\*[\\s\\S]+?\\*\\//g,\n        cssImports: /(?:@import\\s*)(?:url\\(\\s*)?(?:['\"])([^'\"]*)(?:['\"])(?:\\s*\\))?(?:[^;]*;)/g\n    };\n    var settings = {\n        include: options.include || 'style,link[rel=\"stylesheet\"]',\n        exclude: options.exclude || null,\n        filter: options.filter || null,\n        onComplete: options.onComplete || Function.prototype,\n        onError: options.onError || Function.prototype,\n        onSuccess: options.onSuccess || Function.prototype\n    };\n    var sourceNodes = Array.apply(null, document.querySelectorAll(settings.include)).filter(function(node) {\n        return !matchesSelector(node, settings.exclude);\n    });\n    var cssArray = Array.apply(null, Array(sourceNodes.length)).map(function(x) {\n        return null;\n    });\n    function handleComplete() {\n        var isComplete = cssArray.indexOf(null) === -1;\n        if (isComplete) {\n            var cssText = cssArray.join(\"\");\n            settings.onComplete(cssText, cssArray, sourceNodes);\n        }\n    }\n    function handleError(xhr, node, url, cssIndex) {\n        var cssText = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : \"\";\n        cssArray[cssIndex] = cssText;\n        settings.onError(xhr, node, url);\n        handleComplete();\n    }\n    function handleSuccess(cssText, cssIndex, node, sourceUrl, importUrl) {\n        if (!settings.filter || settings.filter.test(cssText)) {\n            var returnVal = settings.onSuccess(cssText, node, importUrl || sourceUrl);\n            cssText = returnVal === false ? \"\" : returnVal || cssText;\n            var importRules = cssText.replace(regex.cssComments, \"\").match(regex.cssImports);\n            if (importRules) {\n                var importUrls = importRules.map(function(decl) {\n                    return decl.replace(regex.cssImports, \"$1\");\n                });\n                importUrls = importUrls.map(function(url) {\n                    return getFullUrl(url, sourceUrl);\n                });\n                getUrls(importUrls, {\n                    onError: function onError(xhr, url, urlIndex) {\n                        handleError(xhr, node, url, cssIndex, cssText);\n                    },\n                    onSuccess: function onSuccess(importText, url, urlIndex) {\n                        var importDecl = importRules[urlIndex];\n                        var importUrl = importUrls[urlIndex];\n                        var newCssText = cssText.replace(importDecl, importText);\n                        handleSuccess(newCssText, cssIndex, node, url, importUrl);\n                    }\n                });\n            } else {\n                cssArray[cssIndex] = cssText;\n                handleComplete();\n            }\n        } else {\n            cssArray[cssIndex] = \"\";\n            handleComplete();\n        }\n    }\n    if (sourceNodes.length) {\n        sourceNodes.forEach(function(node, i) {\n            var linkHref = node.getAttribute(\"href\");\n            var linkRel = node.getAttribute(\"rel\");\n            var isLink = node.nodeName === \"LINK\" && linkHref && linkRel && linkRel.toLowerCase() === \"stylesheet\";\n            var isStyle = node.nodeName === \"STYLE\";\n            if (isLink) {\n                getUrls(linkHref, {\n                    mimeType: \"text/css\",\n                    onError: function onError(xhr, url, urlIndex) {\n                        handleError(xhr, node, url, i);\n                    },\n                    onSuccess: function onSuccess(cssText, url, urlIndex) {\n                        var sourceUrl = getFullUrl(linkHref, location.href);\n                        handleSuccess(cssText, i, node, sourceUrl);\n                    }\n                });\n            } else if (isStyle) {\n                handleSuccess(node.textContent, i, node, location.href);\n            } else {\n                cssArray[i] = \"\";\n                handleComplete();\n            }\n        });\n    } else {\n        settings.onComplete(\"\", []);\n    }\n}\n\nfunction getFullUrl(url) {\n    var base = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : location.href;\n    var d = document.implementation.createHTMLDocument(\"\");\n    var b = d.createElement(\"base\");\n    var a = d.createElement(\"a\");\n    d.head.appendChild(b);\n    d.body.appendChild(a);\n    b.href = base;\n    a.href = url;\n    return a.href;\n}\n\nfunction matchesSelector(elm, selector) {\n    var matches = elm.matches || elm.matchesSelector || elm.webkitMatchesSelector || elm.mozMatchesSelector || elm.msMatchesSelector || elm.oMatchesSelector;\n    return matches.call(elm, selector);\n}\n\nexport default getCssData;\n//# sourceMappingURL=get-css-data.esm.js.map\n","// Functions\n// =============================================================================\n/**\n * Performs a deep merge of objects and returns new object. Does not modify\n * objects (immutable) and merges arrays via concatenation.\n *\n * @param {...object} objects - Objects to merge\n * @returns {object} New object with merged key/values\n */\nfunction mergeDeep(...objects) {\n    const isObject = obj => obj instanceof Object && obj.constructor === Object;\n\n    return objects.reduce((prev, obj) => {\n        Object.keys(obj).forEach(key => {\n            const pVal = prev[key];\n            const oVal = obj[key];\n\n            // if (Array.isArray(pVal) && Array.isArray(oVal)) {\n            //     prev[key] = pVal.concat(...oVal);\n            // }\n            if (isObject(pVal) && isObject(oVal)) {\n                prev[key] = mergeDeep(pVal, oVal);\n            }\n            else {\n                prev[key] = oVal;\n            }\n        });\n\n        return prev;\n    }, {});\n}\n\n\n// Export\n// =============================================================================\nexport default mergeDeep;\n","'use strict';\nmodule.exports = balanced;\nfunction balanced(a, b, str) {\n  if (a instanceof RegExp) a = maybeMatch(a, str);\n  if (b instanceof RegExp) b = maybeMatch(b, str);\n\n  var r = range(a, b, str);\n\n  return r && {\n    start: r[0],\n    end: r[1],\n    pre: str.slice(0, r[0]),\n    body: str.slice(r[0] + a.length, r[1]),\n    post: str.slice(r[1] + b.length)\n  };\n}\n\nfunction maybeMatch(reg, str) {\n  var m = str.match(reg);\n  return m ? m[0] : null;\n}\n\nbalanced.range = range;\nfunction range(a, b, str) {\n  var begs, beg, left, right, result;\n  var ai = str.indexOf(a);\n  var bi = str.indexOf(b, ai + 1);\n  var i = ai;\n\n  if (ai >= 0 && bi > 0) {\n    begs = [];\n    left = str.length;\n\n    while (i >= 0 && !result) {\n      if (i == ai) {\n        begs.push(i);\n        ai = str.indexOf(a, i + 1);\n      } else if (begs.length == 1) {\n        result = [ begs.pop(), bi ];\n      } else {\n        beg = begs.pop();\n        if (beg < left) {\n          left = beg;\n          right = bi;\n        }\n\n        bi = str.indexOf(b, i + 1);\n      }\n\n      i = ai < bi && ai >= 0 ? ai : bi;\n    }\n\n    if (begs.length) {\n      result = [ left, right ];\n    }\n  }\n\n  return result;\n}\n","/**\n * Based on css parser/compiler by NxChg\n * https://github.com/NxtChg/pieces/tree/master/js/css_parser\n */\n\n\n// Functions\n// =============================================================================\n/**\n * Parses CSS string and generates AST object\n *\n * @param {string} css The CSS stringt to be converted to an AST\n * @returns {object}\n */\nfunction cssParse(css) {\n    const errors = [];\n\n    // Errors\n    // -------------------------------------------------------------------------\n    function error(msg) {\n        throw new Error(`CSS parse error: ${msg}`);\n    }\n\n    // RegEx\n    // -------------------------------------------------------------------------\n    // Match regexp and return captures\n    function match(re) {\n        const m = re.exec(css);\n\n        if (m) {\n            css = css.slice(m[0].length);\n\n            return m;\n        }\n    }\n\n    function whitespace() {\n        match(/^\\s*/);\n    }\n    function open() {\n        return match(/^{\\s*/);\n    }\n    function close() {\n        return match(/^}/);\n    }\n\n    // Comments\n    // -------------------------------------------------------------------------\n    function comment() {\n        whitespace();\n\n        if (css[0] !== '/' || css[1] !== '*') { return; }\n\n        let i = 2;\n        while (css[i] && (css[i] !== '*' || css[i + 1] !== '/')) { i++; }\n\n        // FIXED\n        if (!css[i]) { return error('end of comment is missing'); }\n\n        const str = css.slice(2, i);\n        css = css.slice(i + 2);\n\n        return { type: 'comment', comment: str };\n    }\n    function comments() {\n        const cmnts = [];\n\n        let c;\n\n        while ((c = comment())) {\n            cmnts.push(c);\n        }\n        return cmnts;\n    }\n\n    // Selector\n    // -------------------------------------------------------------------------\n    function selector() {\n        whitespace();\n        while (css[0] === '}') {\n            error('extra closing bracket');\n        }\n\n        const m = match(/^((\"(?:\\\\\"|[^\"])*\"|'(?:\\\\'|[^'])*'|[^{])+)/);\n\n        if (m)\n        { return m[0]\n            .trim() // remove all comments from selectors\n            .replace(/\\/\\*([^*]|[\\r\\n]|(\\*+([^*/]|[\\r\\n])))*\\*\\/+/g, '')\n            .replace(/\"(?:\\\\\"|[^\"])*\"|'(?:\\\\'|[^'])*'/g, function(m) {\n                return m.replace(/,/g, '\\u200C');\n            })\n            .split(/\\s*(?![^(]*\\)),\\s*/)\n            .map(function(s) {\n                return s.replace(/\\u200C/g, ',');\n            }); }\n    }\n\n    // Declarations\n    // -------------------------------------------------------------------------\n    function declaration() {\n        match(/^([;\\s]*)+/); // ignore empty declarations + whitespace\n\n        const comment_regexp = /\\/\\*[^*]*\\*+([^/*][^*]*\\*+)*\\//g;\n\n        let prop = match(/^(\\*?[-#/*\\\\\\w]+(\\[[0-9a-z_-]+\\])?)\\s*/);\n        if (!prop) { return; }\n\n        prop = prop[0].trim();\n\n        if (!match(/^:\\s*/)) { return error('property missing \\':\\''); }\n\n        // Quotes regex repeats verbatim inside and outside parentheses\n        const val = match(/^((?:\\/\\*.*?\\*\\/|'(?:\\\\'|.)*?'|\"(?:\\\\\"|.)*?\"|\\((\\s*'(?:\\\\'|.)*?'|\"(?:\\\\\"|.)*?\"|[^)]*?)\\s*\\)|[^};])+)/);\n\n        const ret = { type: 'declaration', property: prop.replace(comment_regexp, ''), value: val ? val[0].replace(comment_regexp, '').trim() : '' };\n\n        match(/^[;\\s]*/);\n\n        return ret;\n    }\n    function declarations() {\n        if (!open()) { return error('missing \\'{\\''); }\n\n        let d,\n            decls = comments();\n\n        while ((d = declaration())) {\n            decls.push(d);\n            decls = decls.concat(comments());\n        }\n\n        if (!close()) { return error('missing \\'}\\''); }\n\n        return decls;\n    }\n\n    // Keyframes\n    // -------------------------------------------------------------------------\n    function keyframe() {\n        whitespace();\n\n        const vals = [];\n\n        let m;\n\n        while ((m = match(/^((\\d+\\.\\d+|\\.\\d+|\\d+)%?|[a-z]+)\\s*/))) {\n            vals.push(m[1]);\n            match(/^,\\s*/);\n        }\n\n        if (vals.length) { return { type: 'keyframe', values: vals, declarations: declarations() }; }\n    }\n    function at_keyframes() {\n        let m = match(/^@([-\\w]+)?keyframes\\s*/);\n\n        if (!m) { return; }\n\n        const vendor = m[1];\n\n        m = match(/^([-\\w]+)\\s*/);\n        if (!m) { return error('@keyframes missing name'); } // identifier\n\n        const name = m[1];\n\n        if (!open()) { return error('@keyframes missing \\'{\\''); }\n\n        let frame,\n            frames = comments();\n        while ((frame = keyframe())) {\n            frames.push(frame);\n            frames = frames.concat(comments());\n        }\n\n        if (!close()) { return error('@keyframes missing \\'}\\''); }\n\n        return { type: 'keyframes', name: name, vendor: vendor, keyframes: frames };\n    }\n\n    // @ Rules\n    // -------------------------------------------------------------------------\n    function at_page() {\n        const m = match(/^@page */);\n        if (m) {\n            const sel = selector() || [];\n            return { type: 'page', selectors: sel, declarations: declarations() };\n        }\n    }\n    function at_fontface() {\n        const m = match(/^@font-face\\s*/);\n        if (m) { return { type: 'font-face', declarations: declarations() }; }\n    }\n    function at_supports() {\n        const m = match(/^@supports *([^{]+)/);\n        if (m) { return { type: 'supports', supports: m[1].trim(), rules: rules() }; }\n    }\n    function at_host() {\n        const m = match(/^@host\\s*/);\n        if (m) { return { type: 'host', rules: rules() }; }\n    }\n    function at_media() {\n        const m = match(/^@media *([^{]+)/);\n        if (m) { return { type: 'media', media: m[1].trim(), rules: rules() }; }\n    }\n    function at_custom_m() {\n        const m = match(/^@custom-media\\s+(--[^\\s]+)\\s*([^{;]+);/);\n        if (m) { return { type: 'custom-media', name: m[1].trim(), media: m[2].trim() }; }\n    }\n    function at_document() {\n        const m = match(/^@([-\\w]+)?document *([^{]+)/);\n        // FIXED\n        if (m) { return { type: 'document', document: m[2].trim(), vendor: m[1] ? m[1].trim() : null, rules: rules() }; }\n    }\n    function at_x() {\n        const m = match(/^@(import|charset|namespace)\\s*([^;]+);/);\n        if (m) { return { type: m[1], name: m[2].trim() }; }\n    }\n    function at_rule() {\n        whitespace();\n        if (css[0] === '@') { return at_keyframes() || at_supports() || at_host() || at_media() || at_custom_m() || at_page() || at_document() || at_fontface() || at_x(); }\n    }\n\n    // Rules\n    // -------------------------------------------------------------------------\n    function rule() {\n        const sel = selector() || [];\n        if (!sel.length) { error('selector missing'); }\n\n        const decls = declarations();\n\n        return { type: 'rule', selectors: sel, declarations: decls };\n    }\n    function rules(core) {\n        if (!core && !open()) { return error('missing \\'{\\''); }\n\n        let node,\n            rules = comments();\n\n        while (css.length && (core || css[0] !== '}') && (node = at_rule() || rule())) {\n            rules.push(node);\n            rules = rules.concat(comments());\n        }\n\n        if (!core && !close()) { return error('missing \\'}\\''); }\n\n        return rules;\n    }\n\n    return { type: 'stylesheet', stylesheet: { rules: rules(true), errors: errors } };\n}\n\n\n// Exports\n// =============================================================================\nexport default cssParse;\n","/**\n * Based on css parser/compiler by NxChg\n * https://github.com/NxtChg/pieces/tree/master/js/css_parser\n */\n\n\n// Functions\n// =============================================================================\n/**\n * Compiles CSS AST to string\n *\n * @param {object}   tree CSS AST object\n * @param {string}   [delim=''] CSS rule delimiter\n * @param {function} cb Function to be called before each node is processed\n * @returns {string}\n */\nfunction stringifyCss(tree, delim = '', cb) {\n    const renderMethods = {\n        charset(node) {\n            return '@charset ' + node.name + ';';\n        },\n        comment(node) {\n            return '';\n        },\n        'custom-media'(node) {\n            return '@custom-media ' + node.name + ' ' + node.media + ';';\n        },\n        declaration(node) {\n            return node.property + ':' + node.value + ';';\n        },\n        document(node) {\n            return '@' + (node.vendor || '') + 'document ' + node.document + '{' + visit(node.rules) + '}';\n        },\n        'font-face'(node) {\n            return '@font-face' + '{' + visit(node.declarations) + '}';\n        },\n        host(node) {\n            return '@host' + '{' + visit(node.rules) + '}';\n        },\n        import(node) {\n            // FIXED\n            return '@import ' + node.name + ';';\n        },\n        keyframe(node) {\n            return node.values.join(',') + '{' + visit(node.declarations) + '}';\n        },\n        keyframes(node) {\n            return '@' + (node.vendor || '') + 'keyframes ' + node.name + '{' + visit(node.keyframes) + '}';\n        },\n        media(node) {\n            return '@media ' + node.media + '{' + visit(node.rules) + '}';\n        },\n        namespace(node) {\n            return '@namespace ' + node.name + ';';\n        },\n        page(node) {\n            return '@page ' + (node.selectors.length ? node.selectors.join(', ') : '') + '{' + visit(node.declarations) + '}';\n        },\n        rule(node) {\n            const decls = node.declarations;\n\n            if (decls.length) {\n                return node.selectors.join(',') + '{' + visit(decls) + '}';\n            }\n        },\n        supports(node) {\n            // FIXED\n            return '@supports ' + node.supports + '{' + visit(node.rules) + '}';\n        }\n    };\n\n    function visit(nodes) {\n        let buf = '';\n\n        for (let i = 0; i < nodes.length; i++) {\n            const n = nodes[i];\n\n            if (cb) {\n                cb(n);\n            }\n\n            const txt = renderMethods[n.type](n);\n\n            if (txt) {\n                buf += txt;\n\n                if (txt.length && n.selectors) {\n                    buf += delim;\n                }\n            }\n        }\n\n        return buf;\n    }\n\n    return visit(tree.stylesheet.rules);\n}\n\n\n// Exports\n// =============================================================================\nexport default stringifyCss;\n","/**\n * Based on rework-vars by reworkcss\n * https://github.com/reworkcss/rework-vars\n */\n\n\n// Dependencies\n// =============================================================================\nimport balanced     from 'balanced-match';\nimport mergeDeep    from './merge-deep';\nimport parseCss     from './parse-css';\nimport stringifyCss from './stringify-css';\n\n\n// Constants & Variables\n// =============================================================================\nconst VAR_PROP_IDENTIFIER = '--';\nconst VAR_FUNC_IDENTIFIER = 'var';\nconst reVarProp = /^--/;\nconst reVarVal  = /^var(.*)/;\n\n\n// Functions\n// =============================================================================\n/**\n * Transforms W3C-style CSS variables to static values and returns an updated\n * CSS string.\n *\n * @param {object}   cssText CSS containing variable definitions and functions\n * @param {object}   [options] Options object\n * @param {boolean}  [options.onlyVars=true] Remove declarations that do not\n *                   contain a CSS variable from the return value. Note that\n *                   @font-face and @keyframe rules require all declarations to\n *                   be returned if a CSS variable is used.\n * @param {boolean}  [options.preserve=true] Preserve CSS variable definitions\n *                   and functions in the return value, allowing \"live\" variable\n *                   updates via JavaScript to continue working in browsers with\n *                   native CSS variable support.\n * @param {object}   [options.variables={}] CSS variable definitions to include\n *                   during transformation. Can be used to add new override\n *                   exisitng definitions.\n * @param {function} [options.onWarning] Callback on each transformation\n *                   warning. Passes 1) warningMessage as an argument.\n * @returns {string}\n */\nfunction transformVars(cssText, options = {}) {\n    const defaults = {\n        onlyVars : true,\n        preserve : true,\n        variables: {},\n        onWarning() {}\n    };\n    const map      = {};\n    const settings = mergeDeep(defaults, options);\n\n    // Convert cssText to AST (this could throw errors)\n    const cssTree = parseCss(cssText);\n\n    // Remove non-vars\n    if (settings.onlyVars) {\n        cssTree.stylesheet.rules = filterVars(cssTree.stylesheet.rules);\n    }\n\n    // Define variables\n    cssTree.stylesheet.rules.forEach(function(rule) {\n        const varNameIndices = [];\n\n        if (rule.type !== 'rule') {\n            return;\n        }\n\n        // only variables declared for `:root` are supported\n        if (rule.selectors.length !== 1 || rule.selectors[0] !== ':root') {\n            return;\n        }\n\n        rule.declarations.forEach(function(decl, i) {\n            const prop = decl.property;\n            const value = decl.value;\n\n            if (prop && prop.indexOf(VAR_PROP_IDENTIFIER) === 0) {\n                map[prop] = value;\n                varNameIndices.push(i);\n            }\n        });\n\n        // optionally remove `--*` properties from the rule\n        if (!settings.preserve) {\n            for (let i = varNameIndices.length - 1; i >= 0; i--) {\n                rule.declarations.splice(varNameIndices[i], 1);\n            }\n        }\n    });\n\n    // Handle variables defined in settings.variables\n    if (Object.keys(settings.variables).length) {\n        const newRule = {\n            declarations: [],\n            selectors   : [':root'],\n            type        : 'rule'\n        };\n\n        Object.keys(settings.variables).forEach(function(key) {\n            // Normalize variables by ensuring all start with leading '--'\n            const varName  = `--${key.replace(/^-+/, '')}`;\n            const varValue = settings.variables[key];\n\n            // Update internal map value with settings.variables value\n            map[varName] = varValue;\n\n            // Add new declaration to newRule\n            newRule.declarations.push({\n                type    : 'declaration',\n                property: varName,\n                value   : varValue\n            });\n        });\n\n        // Append new :root ruleset\n        if (settings.preserve) {\n            cssTree.stylesheet.rules.push(newRule);\n        }\n    }\n\n    // Resolve variables\n    walkCss(cssTree.stylesheet, function(declarations, node) {\n        let decl;\n        let resolvedValue;\n        let value;\n\n        for (let i = 0; i < declarations.length; i++) {\n            decl = declarations[i];\n            value = decl.value;\n\n            // skip comments\n            if (decl.type !== 'declaration') {\n                continue;\n            }\n\n            // skip values that don't contain variable functions\n            if (!value || value.indexOf(VAR_FUNC_IDENTIFIER + '(') === -1) {\n                continue;\n            }\n\n            resolvedValue = resolveValue(value, map, settings);\n\n            if (resolvedValue !== 'undefined') {\n                if (!settings.preserve) {\n                    decl.value = resolvedValue;\n                }\n                else {\n                    declarations.splice(i, 0, {\n                        type    : decl.type,\n                        property: decl.property,\n                        value   : resolvedValue\n                    });\n\n                    // skip ahead of preserved declaration\n                    i++;\n                }\n            }\n        }\n    });\n\n    // Return CSS string\n    return stringifyCss(cssTree);\n}\n\n\n// Functions (Private)\n// =============================================================================\n/**\n * Filters rules recursively, retaining only declarations that contain either a\n * CSS variable definition (property) or function (value). Maintains all\n * declarations for @font-face and @keyframes rules that contain a CSS\n * definition or function.\n *\n * @param {array} rules\n * @returns {array}\n */\nfunction filterVars(rules) {\n    return rules.filter(rule => {\n        // Rule, @font-face, @host, @page\n        if (rule.declarations) {\n            // @font-face rules require all declarations to be retained if any\n            // declaration contains a CSS variable definition or value.\n            // For other rules, any declaration that does not contain a CSS\n            // variable can be removed.\n            let declArray = rule.type === 'font-face' ? [] : rule.declarations;\n\n            declArray = rule.declarations.filter(d => reVarProp.test(d.property) || reVarVal.test(d.value));\n\n            return Boolean(declArray.length);\n        }\n        // @keyframes\n        else if (rule.keyframes) {\n            // @keyframe rules require all declarations to be retained if any\n            // declaration contains a CSS variable definition or value.\n            return Boolean(rule.keyframes.filter(k =>\n                Boolean(k.declarations.filter(d => reVarProp.test(d.property) || reVarVal.test(d.value)).length)\n            ).length);\n        }\n        // @document, @media, @supports\n        else if (rule.rules) {\n            rule.rules = filterVars(rule.rules).filter(r => r.declarations.length);\n\n            return Boolean(rule.rules.length);\n        }\n\n        return true;\n    });\n}\n\n/**\n * Resolve CSS variables in a value\n *\n * The second argument to a CSS variable function, if provided, is a fallback\n * value, which is used as the substitution value when the referenced variable\n * is invalid.\n *\n * var(name[, fallback])\n *\n * @param {string} value A property value containing a CSS variable function\n * @param {object} map A map of variable names and values\n * @param {object} settings Settings object passed from transformVars()\n * @return {string} A new value with CSS variables substituted or using fallback\n */\nfunction resolveValue(value, map, settings) {\n    // matches `name[, fallback]`, captures 'name' and 'fallback'\n    const RE_VAR = /([\\w-]+)(?:\\s*,\\s*)?(.*)?/;\n    const balancedParens = balanced('(', ')', value);\n    const varStartIndex  = value.indexOf('var(');\n    const varRef         = balanced('(', ')', value.substring(varStartIndex)).body;\n    const warningIntro   = 'CSS transform warning:';\n\n    /* istanbul ignore next */\n    if (!balancedParens) {\n        settings.onWarning(`${warningIntro} missing closing \")\" in the value \"${value}\"`);\n    }\n\n    /* istanbul ignore next */\n    if (varRef === '') {\n        settings.onWarning(`${warningIntro} var() must contain a non-whitespace string`);\n    }\n\n    const varFunc = VAR_FUNC_IDENTIFIER + '(' + varRef + ')';\n\n    const varResult = varRef.replace(RE_VAR, function(_, name, fallback) {\n        const replacement = map[name];\n\n        if (!replacement && !fallback) {\n            settings.onWarning(`${warningIntro} variable \"${name}\" is undefined`);\n        }\n\n        if (!replacement && fallback) {\n            return fallback;\n        }\n\n        return replacement;\n    });\n\n    // resolve the variable\n    value = value.split(varFunc).join(varResult);\n\n    // recursively resolve any remaining variables in the value\n    if (value.indexOf(VAR_FUNC_IDENTIFIER) !== -1) {\n        value = resolveValue(value, map, settings);\n    }\n\n    return value;\n}\n\n/**\n * Visit `node` declarations recursively and invoke `fn(declarations, node)`.\n *\n * Based on rework-visit by reworkcss\n * https://github.com/reworkcss/rework-visit\n *\n * @param {object} node\n * @param {function} fn\n */\nfunction walkCss(node, fn){\n    node.rules.forEach(function(rule){\n        // @media etc\n        if (rule.rules) {\n            walkCss(rule, fn);\n\n            return;\n        }\n\n        // keyframes\n        if (rule.keyframes) {\n            rule.keyframes.forEach(function(keyframe){\n                if (keyframe.type === 'keyframe') {\n                    fn(keyframe.declarations, rule);\n                }\n            });\n\n            return;\n        }\n\n        // @charset, @import etc\n        if (!rule.declarations) {\n            return;\n        }\n\n        fn(rule.declarations, node);\n    });\n}\n\n\n// Exports\n// =============================================================================\nexport default transformVars;\n","// Dependencies\n// =============================================================================\nimport getCssData          from 'get-css-data';\nimport mergeDeep           from './merge-deep';\nimport transformCss        from './transform-css';\nimport { name as pkgName } from '../package.json';\n\n\n// Constants & Variables\n// =============================================================================\nconst defaults = {\n    // Sources\n    include    : 'style,link[rel=stylesheet]',\n    exclude    : '',\n    // Options\n    appendStyle: true,  // cssVars\n    onlyLegacy : true,  // cssVars\n    onlyVars   : true,  // cssVars, transformCss\n    preserve   : true,  // transformCss\n    silent     : false, // cssVars\n    variables  : {},    // transformCss\n    // Callbacks\n    onSuccess() {},     // cssVars\n    onError() {},       // cssVars\n    onWarning() {},     // transformCss\n    onComplete() {}     // cssVars\n};\n// Regex: CSS variable :root declarations and var() function values\nconst reCssVars = /(?:(?::root\\s*{\\s*[^;]*;*\\s*)|(?:var\\(\\s*))(--[^:)]+)(?:\\s*[:)])/;\n\n\n\n\n// Functions\n// =============================================================================\n/**\n * Description\n *\n * @preserve\n * @param {object}   [options] Options object\n * @param {string}   [options.include=\"style,link[rel=stylesheet]\"] CSS selector\n *                   matching <link> and <style> nodes to include\n * @param {string}   [options.exclude=\"\"] CSS selector matching <link> and\n *                   <style> nodes to exclude\n * @param {boolean}  [options.appendStyle=true] Append <style> node containing\n *                   updated CSS to DOM\n * @param {boolean}  [options.onlyLegacy=true] Only process CSS variables in\n *                   browsers that lack native support\n * @param {boolean}  [options.onlyVars=true] Remove declarations that do not\n *                   contain a CSS variable from the return value. Note that\n *                   font-face and keyframe rules require all declarations to be\n *                   returned if a CSS variable is used.\n * @param {boolean}  [options.preserve=true] Preserve CSS variable definitions\n *                   and functions in the return value, allowing \"live\" variable\n *                   updates via JavaScript to continue working in browsers with\n *                   native CSS variable support.\n * @param {boolean}  [options.silent=false] Prevent console warnign and error\n *                   messages\n * @param {object}   [options.variables={}] CSS variable definitions to include\n *                   during transformation. Can be used to add new override\n *                   exisitng definitions.\n * @param {function} [options.onSuccess] Callback after all stylesheets have\n *                   been processed succesfully. Passes 1) a CSS string with CSS\n *                   variable values resolved as an argument. Modifying the CSS\n *                   appended when 'appendStyle' is 'true' can be done by\n *                   returning a string value from this funtion (or 'false' to\n *                   skip).\n * @param {function} [options.onError] Callback on each error. Passes 1) an\n *                   error message, and 2) source node reference as arguments.\n * @param {function} [options.onWarning] Callback on each warning. Passes 1) a\n *                   warning message as an argument.\n * @param {function} [options.onComplete] Callback after all stylesheets have\n *                   been processed succesfully and <style> node containing\n *                   updated CSS has been appended to the DOM (based on\n *                   'appendStyle' setting. Passes 1) a CSS string with CSS\n *                   variable values resolved, and 2) a reference to the\n *                   appended <style> node.\n *\n * @example\n *\n *   cssVars({\n *     include    : 'style,link[rel=\"stylesheet\"]', // default\n *     exclude    : '',\n *     appendStyle: true, // default\n *     onlyLegacy : true, // default\n *     onlyVars   : true, // default\n *     preserve   : true, // default\n *     silent     : false, // default\n *     onError(message, node) {\n *       // ...\n *     },\n *     onWarning(message) {\n *       // ...\n *     },\n *     onSuccess(cssText) {\n *       // ...\n *     },\n *     onComplete(cssText, styleNode) {\n *       // ...\n *     }\n *   });\n */\nfunction cssVars(options = {}) {\n    const settings = mergeDeep(defaults, options);\n\n    function handleError(message, sourceNode) {\n        /* istanbul ignore next */\n        if (!settings.silent) {\n            // eslint-disable-next-line\n            console.error(`${message}\\n`, sourceNode);\n        }\n\n        settings.onError(message, sourceNode);\n    }\n\n    function handleWarning(message) {\n        /* istanbul ignore next */\n        if (!settings.silent) {\n            // eslint-disable-next-line\n            console.warn(message);\n        }\n\n        settings.onWarning(message);\n    }\n\n    // Verify readyState to ensure all <link> and <style> nodes are available\n    if (document.readyState !== 'loading') {\n        const hasNativeSupport = window.CSS && window.CSS.supports && window.CSS.supports('(--a: 0)');\n\n        // Lacks native support or onlyLegacy 'false'\n        if (!hasNativeSupport || !settings.onlyLegacy) {\n            const styleNodeId = pkgName;\n\n            getCssData({\n                include: settings.include,\n                // Always exclude styleNodeId element, which is the generated\n                // <style> node containing previously transformed CSS.\n                exclude: `#${styleNodeId}` + (settings.exclude ? `,${settings.exclude}` : ''),\n                // This filter does a test on each block of CSS. An additional\n                // filter is used in the parser to remove individual\n                // declarations.\n                filter : settings.onlyVars ? reCssVars : null,\n                onComplete(cssText, cssArray, nodeArray) {\n                    let styleNode = null;\n\n                    try {\n                        cssText = transformCss(cssText, {\n                            onlyVars : settings.onlyVars,\n                            preserve : settings.preserve,\n                            variables: settings.variables,\n                            onWarning: handleWarning\n                        });\n\n                        // Success if an error was not been throw during\n                        // transformation. Store the onSuccess return value,\n                        // which allows modifying cssText before passing to\n                        // onComplete and/or appending to new <style> node.\n                        const returnVal = settings.onSuccess(cssText);\n\n                        // Set cssText to return value (if provided)\n                        cssText = returnVal === false ? 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diff --git a/dist/css-vars-ponyfill.esm.min.js b/dist/css-vars-ponyfill.esm.min.js
new file mode 100644
index 0000000..e0a14c4
--- /dev/null
+++ b/dist/css-vars-ponyfill.esm.min.js
@@ -0,0 +1,16 @@
+/*!
+ * css-vars-ponyfill
+ * v0.0.1
+ * https://github.com/jhildenbiddle/css-vars-ponyfill
+ * (c) 2018 John Hildenbiddle <http://hildenbiddle.com>
+ * MIT license
+ */
+/*!
+ * get-css-data
+ * v1.1.1
+ * https://github.com/jhildenbiddle/get-css-data
+ * (c) 2018 John Hildenbiddle <http://hildenbiddle.com>
+ * MIT license
+ */
+function getUrls(e){var r=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{},n={mimeType:r.mimeType||null,onComplete:r.onComplete||Function.prototype,onError:r.onError||Function.prototype,onSuccess:r.onSuccess||Function.prototype},t=Array.isArray(e)?e:[e],o=Array.apply(null,Array(t.length)).map(function(e){return null});function s(e,r){n.onError(e,t[r],r)}function a(e,r){o[r]=e,n.onSuccess(e,t[r],r),-1===o.indexOf(null)&&n.onComplete(o)}t.forEach(function(e,r){var t=document.createElement("a");t.setAttribute("href",e),t.href=t.href;var o=t.host!==location.host,i=t.protocol===location.protocol;if(o&&"undefined"!=typeof XDomainRequest)if(i){var c=new XDomainRequest;c.open("GET",e),c.timeout=0,c.onprogress=Function.prototype,c.ontimeout=Function.prototype,c.onload=function(){a(c.responseText,r)},c.onerror=function(e){s(c,r)},setTimeout(function(){c.send()},0)}else console.log("Internet Explorer 9 Cross-Origin (CORS) requests must use the same protocol"),s(null,r);else{var l=new 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r("@keyframes missing '{'");for(var c=void 0,l=i();c=f();)l.push(c),l=l.concat(i());return s()?{type:"keyframes",name:a,vendor:t,keyframes:l}:r("@keyframes missing '}'")}}()||function(){var e=n(/^@supports *([^{]+)/);if(e)return{type:"supports",supports:e[1].trim(),rules:m()}}()||function(){if(n(/^@host\s*/))return{type:"host",rules:m()}}()||function(){var e=n(/^@media *([^{]+)/);if(e)return{type:"media",media:e[1].trim(),rules:m()}}()||function(){var e=n(/^@custom-media\s+(--[^\s]+)\s*([^{;]+);/);if(e)return{type:"custom-media",name:e[1].trim(),media:e[2].trim()}}()||function(){if(n(/^@page */))return{type:"page",selectors:c()||[],declarations:u()}}()||function(){var e=n(/^@([-\w]+)?document *([^{]+)/);if(e)return{type:"document",document:e[2].trim(),vendor:e[1]?e[1].trim():null,rules:m()}}()||function(){if(n(/^@font-face\s*/))return{type:"font-face",declarations:u()}}()||function(){var e=n(/^@(import|charset|namespace)\s*([^;]+);/);if(e)return{type:e[1],name:e[2].trim()}}()}function m(n){if(!n&&!o())return r("missing '{'");for(var t,a=void 0,l=i();e.length&&(n||"}"!==e[0])&&(a=p()||(void 0,(t=c()||[]).length||r("selector missing"),{type:"rule",selectors:t,declarations:u()}));)l.push(a),l=l.concat(i());return n||s()?l:r("missing '}'")}return{type:"stylesheet",stylesheet:{rules:m(!0),errors:[]}}}function stringifyCss(e){var r=arguments.length>1&&void 0!==arguments[1]?arguments[1]:"",n=arguments[2],t={charset:function(e){return"@charset "+e.name+";"},comment:function(e){return""},"custom-media":function(e){return"@custom-media "+e.name+" "+e.media+";"},declaration:function(e){return e.property+":"+e.value+";"},document:function(e){return"@"+(e.vendor||"")+"document "+e.document+"{"+o(e.rules)+"}"},"font-face":function(e){return"@font-face{"+o(e.declarations)+"}"},host:function(e){return"@host{"+o(e.rules)+"}"},import:function(e){return"@import "+e.name+";"},keyframe:function(e){return e.values.join(",")+"{"+o(e.declarations)+"}"},keyframes:function(e){return"@"+(e.vendor||"")+"keyframes "+e.name+"{"+o(e.keyframes)+"}"},media:function(e){return"@media "+e.media+"{"+o(e.rules)+"}"},namespace:function(e){return"@namespace "+e.name+";"},page:function(e){return"@page "+(e.selectors.length?e.selectors.join(", "):"")+"{"+o(e.declarations)+"}"},rule:function(e){var r=e.declarations;if(r.length)return e.selectors.join(",")+"{"+o(r)+"}"},supports:function(e){return"@supports "+e.supports+"{"+o(e.rules)+"}"}};function o(e){for(var o="",s=0;s<e.length;s++){var a=e[s];n&&n(a);var i=t[a.type](a);i&&(o+=i,i.length&&a.selectors&&(o+=r))}return o}return o(e.stylesheet.rules)}balanced.range=range;var VAR_PROP_IDENTIFIER="--",VAR_FUNC_IDENTIFIER="var",reVarProp=/^--/,reVarVal=/^var(.*)/;function transformVars(e){var r={},n=mergeDeep({onlyVars:!0,preserve:!0,variables:{},onWarning:function(){}},arguments.length>1&&void 0!==arguments[1]?arguments[1]:{}),t=cssParse(e);if(n.onlyVars&&(t.stylesheet.rules=filterVars(t.stylesheet.rules)),t.stylesheet.rules.forEach(function(e){var t=[];if("rule"===e.type&&1===e.selectors.length&&":root"===e.selectors[0]&&(e.declarations.forEach(function(e,n){var o=e.property,s=e.value;o&&0===o.indexOf(VAR_PROP_IDENTIFIER)&&(r[o]=s,t.push(n))}),!n.preserve))for(var o=t.length-1;o>=0;o--)e.declarations.splice(t[o],1)}),Object.keys(n.variables).length){var o={declarations:[],selectors:[":root"],type:"rule"};Object.keys(n.variables).forEach(function(e){var t="--"+e.replace(/^-+/,""),s=n.variables[e];r[t]=s,o.declarations.push({type:"declaration",property:t,value:s})}),n.preserve&&t.stylesheet.rules.push(o)}return walkCss(t.stylesheet,function(e,t){for(var o=void 0,s=void 0,a=void 0,i=0;i<e.length;i++)a=(o=e[i]).value,"declaration"===o.type&&a&&-1!==a.indexOf(VAR_FUNC_IDENTIFIER+"(")&&"undefined"!==(s=resolveValue(a,r,n))&&(n.preserve?(e.splice(i,0,{type:o.type,property:o.property,value:s}),i++):o.value=s)}),stringifyCss(t)}function filterVars(e){return e.filter(function(e){if(e.declarations){var r="font-face"===e.type||e.declarations;return r=e.declarations.filter(function(e){return reVarProp.test(e.property)||reVarVal.test(e.value)}),Boolean(r.length)}return e.keyframes?Boolean(e.keyframes.filter(function(e){return Boolean(e.declarations.filter(function(e){return reVarProp.test(e.property)||reVarVal.test(e.value)}).length)}).length):!e.rules||(e.rules=filterVars(e.rules).filter(function(e){return e.declarations.length}),Boolean(e.rules.length))})}function resolveValue(e,r,n){var t=balancedMatch("(",")",e),o=e.indexOf("var("),s=balancedMatch("(",")",e.substring(o)).body,a="CSS transform warning:";t||n.onWarning(a+' missing closing ")" in the value "'+e+'"'),""===s&&n.onWarning(a+" var() must contain a non-whitespace string");var i=VAR_FUNC_IDENTIFIER+"("+s+")",c=s.replace(/([\w-]+)(?:\s*,\s*)?(.*)?/,function(e,t,o){var s=r[t];return s||o||n.onWarning(a+' variable "'+t+'" is undefined'),!s&&o?o:s});return-1!==(e=e.split(i).join(c)).indexOf(VAR_FUNC_IDENTIFIER)&&(e=resolveValue(e,r,n)),e}function walkCss(e,r){e.rules.forEach(function(n){n.rules?walkCss(n,r):n.keyframes?n.keyframes.forEach(function(e){"keyframe"===e.type&&r(e.declarations,n)}):n.declarations&&r(n.declarations,e)})}var name="css-vars-ponyfill",defaults={include:"style,link[rel=stylesheet]",exclude:"",appendStyle:!0,onlyLegacy:!0,onlyVars:!0,preserve:!0,silent:!1,variables:{},onSuccess:function(){},onError:function(){},onWarning:function(){},onComplete:function(){}},reCssVars=/(?:(?::root\s*{\s*[^;]*;*\s*)|(?:var\(\s*))(--[^:)]+)(?:\s*[:)])/;function cssVars(){var e=arguments.length>0&&void 0!==arguments[0]?arguments[0]:{},r=mergeDeep(defaults,e);function n(e,n){r.silent||console.error(e+"\n",n),r.onError(e,n)}function t(e){r.silent||console.warn(e),r.onWarning(e)}if("loading"!==document.readyState){if(!(window.CSS&&window.CSS.supports&&window.CSS.supports("(--a: 0)"))||!r.onlyLegacy){var o=name;getCssData({include:r.include,exclude:"#"+o+(r.exclude?","+r.exclude:""),filter:r.onlyVars?reCssVars:null,onComplete:function(e,s,a){var i=null;try{e=transformVars(e,{onlyVars:r.onlyVars,preserve:r.preserve,variables:r.variables,onWarning:t});var c=r.onSuccess(e);if(e=!1===c?"":c||e,r.appendStyle){(i=document.querySelector("#"+o)||document.createElement("style")).setAttribute("id",o),i.textContent!==e&&(i.textContent=e);var l=document.querySelector("body link[rel=stylesheet], body style:not(#"+o+")")?document.body:document.head,u=i.parentNode!==l,f=matchesSelector$1(i,"style:last-of-type");!u&&f||l.appendChild(i)}}catch(e){var p=!1;s.forEach(function(e,t){try{e=transformVars(e,r)}catch(e){var o=a[t-0];p=!0,n(e.message,o)}}),p||n(e.message||e)}r.onComplete(e,i)},onError:function(e,r,t){n("Unable to process "+t+" ("+e.status+" - "+e.statusText+"}",r)}})}}else document.addEventListener("DOMContentLoaded",function r(n){cssVars(e),document.removeEventListener("DOMContentLoaded",r)})}function matchesSelector$1(e,r){return(e.matches||e.matchesSelector||e.webkitMatchesSelector||e.mozMatchesSelector||e.msMatchesSelector||e.oMatchesSelector).call(e,r)}export default cssVars;
+//# sourceMappingURL=css-vars-ponyfill.esm.min.js.map
diff --git a/dist/css-vars-ponyfill.esm.min.js.map b/dist/css-vars-ponyfill.esm.min.js.map
new file mode 100644
index 0000000..54f1a7d
--- /dev/null
+++ b/dist/css-vars-ponyfill.esm.min.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"css-vars-ponyfill.esm.min.js","sources":["../node_modules/get-css-data/dist/get-css-data.esm.js","../src/merge-deep.js","../node_modules/balanced-match/index.js","../src/parse-css.js","../src/stringify-css.js","../src/transform-css.js","../src/index.js"],"sourcesContent":["/*!\n * get-css-data\n * v1.1.1\n * https://github.com/jhildenbiddle/get-css-data\n * (c) 2018 John Hildenbiddle <http://hildenbiddle.com>\n * MIT license\n */\nfunction getUrls(urls) {\n    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};\n    var settings = {\n        mimeType: options.mimeType || null,\n        onComplete: options.onComplete || Function.prototype,\n        onError: options.onError || Function.prototype,\n        onSuccess: options.onSuccess || Function.prototype\n    };\n    var urlArray = Array.isArray(urls) ? urls : [ urls ];\n    var urlQueue = Array.apply(null, Array(urlArray.length)).map(function(x) {\n        return null;\n    });\n    function onError(xhr, urlIndex) {\n        settings.onError(xhr, urlArray[urlIndex], urlIndex);\n    }\n    function onSuccess(responseText, urlIndex) {\n        urlQueue[urlIndex] = responseText;\n        settings.onSuccess(responseText, urlArray[urlIndex], urlIndex);\n        if (urlQueue.indexOf(null) === -1) {\n            settings.onComplete(urlQueue);\n        }\n    }\n    urlArray.forEach(function(url, i) {\n        var parser = document.createElement(\"a\");\n        parser.setAttribute(\"href\", url);\n        parser.href = parser.href;\n        var isCrossDomain = parser.host !== location.host;\n        var isSameProtocol = parser.protocol === location.protocol;\n        if (isCrossDomain && typeof XDomainRequest !== \"undefined\") {\n            if (isSameProtocol) {\n                var xdr = new XDomainRequest();\n                xdr.open(\"GET\", url);\n                xdr.timeout = 0;\n                xdr.onprogress = Function.prototype;\n                xdr.ontimeout = Function.prototype;\n                xdr.onload = function() {\n                    onSuccess(xdr.responseText, i);\n                };\n                xdr.onerror = function(err) {\n                    onError(xdr, i);\n                };\n                setTimeout(function() {\n                    xdr.send();\n                }, 0);\n            } else {\n                console.log(\"Internet Explorer 9 Cross-Origin (CORS) requests must use the same protocol\");\n                onError(null, i);\n            }\n        } else {\n            var xhr = new XMLHttpRequest();\n            xhr.open(\"GET\", url);\n            if (settings.mimeType && xhr.overrideMimeType) {\n                xhr.overrideMimeType(settings.mimeType);\n            }\n            xhr.onreadystatechange = function() {\n                if (xhr.readyState === 4) {\n                    if (xhr.status === 200) {\n                        onSuccess(xhr.responseText, i);\n                    } else {\n                        onError(xhr, i);\n                    }\n                }\n            };\n            xhr.send();\n        }\n    });\n}\n\n/**\n * Gets CSS data from <style> and <link> nodes (including @imports), then\n * returns data in order processed by DOM. Allows specifying nodes to\n * include/exclude and filtering CSS data using RegEx.\n *\n * @preserve\n * @param {object} [options={}] - The options object\n * @param {string} options.include - CSS selector matching <link> and <style>\n * nodes to include\n * @param {string} options.exclude - CSS selector matching <link> and <style>\n * nodes to exclude\n * @param {object} options.filter - Regular expression used to filter node CSS\n * data. Each block of CSS data is tested against the filter, and only matching\n * data is included.\n * @param {function} options.onComplete - Callback after all nodes have been\n * processed. Passes 1) concatenated CSS text, 2) an array of CSS text in DOM\n * order, and 3) an array of nodes in DOM order as arguments.\n * @param {function} options.onError - Callback on each error. Passes 1) the XHR\n * object for inspection, 2) soure node reference, and 3) the source URL that\n * failed (either a <link> href or an @import) as arguments\n * @param {function} options.onSuccess - Callback on each CSS node read. Passes\n * 1) CSS text, 2) source node reference, and 3) the source URL (either a <link>\n *    href or an import) as arguments.\n * @example\n *\n *   getCssData({\n *     include: 'style,link[rel=\"stylesheet\"]', // default\n *     exclude: '[href=\"skip.css\"]',\n *     filter : /red/,\n *     onComplete(cssText, cssArray) {\n *       // ...\n *     },\n *     onError(xhr, node, url) {\n *       // ...\n *     },\n *     onSuccess(cssText, node, url) {\n *       // ...\n *     }\n *   });\n */ function getCssData(options) {\n    var regex = {\n        cssComments: /\\/\\*[\\s\\S]+?\\*\\//g,\n        cssImports: /(?:@import\\s*)(?:url\\(\\s*)?(?:['\"])([^'\"]*)(?:['\"])(?:\\s*\\))?(?:[^;]*;)/g\n    };\n    var settings = {\n        include: options.include || 'style,link[rel=\"stylesheet\"]',\n        exclude: options.exclude || null,\n        filter: options.filter || null,\n        onComplete: options.onComplete || Function.prototype,\n        onError: options.onError || Function.prototype,\n        onSuccess: options.onSuccess || Function.prototype\n    };\n    var sourceNodes = Array.apply(null, document.querySelectorAll(settings.include)).filter(function(node) {\n        return !matchesSelector(node, settings.exclude);\n    });\n    var cssArray = Array.apply(null, Array(sourceNodes.length)).map(function(x) {\n        return null;\n    });\n    function handleComplete() {\n        var isComplete = cssArray.indexOf(null) === -1;\n        if (isComplete) {\n            var cssText = cssArray.join(\"\");\n            settings.onComplete(cssText, cssArray, sourceNodes);\n        }\n    }\n    function handleError(xhr, node, url, cssIndex) {\n        var cssText = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : \"\";\n        cssArray[cssIndex] = cssText;\n        settings.onError(xhr, node, url);\n        handleComplete();\n    }\n    function handleSuccess(cssText, cssIndex, node, sourceUrl, importUrl) {\n        if (!settings.filter || settings.filter.test(cssText)) {\n            var returnVal = settings.onSuccess(cssText, node, importUrl || sourceUrl);\n            cssText = returnVal === false ? \"\" : returnVal || cssText;\n            var importRules = cssText.replace(regex.cssComments, \"\").match(regex.cssImports);\n            if (importRules) {\n                var importUrls = importRules.map(function(decl) {\n                    return decl.replace(regex.cssImports, \"$1\");\n                });\n                importUrls = importUrls.map(function(url) {\n                    return getFullUrl(url, sourceUrl);\n                });\n                getUrls(importUrls, {\n                    onError: function onError(xhr, url, urlIndex) {\n                        handleError(xhr, node, url, cssIndex, cssText);\n                    },\n                    onSuccess: function onSuccess(importText, url, urlIndex) {\n                        var importDecl = importRules[urlIndex];\n                        var importUrl = importUrls[urlIndex];\n                        var newCssText = cssText.replace(importDecl, importText);\n                        handleSuccess(newCssText, cssIndex, node, url, importUrl);\n                    }\n                });\n            } else {\n                cssArray[cssIndex] = cssText;\n                handleComplete();\n            }\n        } else {\n            cssArray[cssIndex] = \"\";\n            handleComplete();\n        }\n    }\n    if (sourceNodes.length) {\n        sourceNodes.forEach(function(node, i) {\n            var linkHref = node.getAttribute(\"href\");\n            var linkRel = node.getAttribute(\"rel\");\n            var isLink = node.nodeName === \"LINK\" && linkHref && linkRel && linkRel.toLowerCase() === \"stylesheet\";\n            var isStyle = node.nodeName === \"STYLE\";\n            if (isLink) {\n                getUrls(linkHref, {\n                    mimeType: \"text/css\",\n                    onError: function onError(xhr, url, urlIndex) {\n                        handleError(xhr, node, url, i);\n                    },\n                    onSuccess: function onSuccess(cssText, url, urlIndex) {\n                        var sourceUrl = getFullUrl(linkHref, location.href);\n                        handleSuccess(cssText, i, node, sourceUrl);\n                    }\n                });\n            } else if (isStyle) {\n                handleSuccess(node.textContent, i, node, location.href);\n            } else {\n                cssArray[i] = \"\";\n                handleComplete();\n            }\n        });\n    } else {\n        settings.onComplete(\"\", []);\n    }\n}\n\nfunction getFullUrl(url) {\n    var base = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : location.href;\n    var d = document.implementation.createHTMLDocument(\"\");\n    var b = d.createElement(\"base\");\n    var a = d.createElement(\"a\");\n    d.head.appendChild(b);\n    d.body.appendChild(a);\n    b.href = base;\n    a.href = url;\n    return a.href;\n}\n\nfunction matchesSelector(elm, selector) {\n    var matches = elm.matches || elm.matchesSelector || elm.webkitMatchesSelector || elm.mozMatchesSelector || elm.msMatchesSelector || elm.oMatchesSelector;\n    return matches.call(elm, selector);\n}\n\nexport default getCssData;\n//# sourceMappingURL=get-css-data.esm.js.map\n","// Functions\n// =============================================================================\n/**\n * Performs a deep merge of objects and returns new object. Does not modify\n * objects (immutable) and merges arrays via concatenation.\n *\n * @param {...object} objects - Objects to merge\n * @returns {object} New object with merged key/values\n */\nfunction mergeDeep(...objects) {\n    const isObject = obj => obj instanceof Object && obj.constructor === Object;\n\n    return objects.reduce((prev, obj) => {\n        Object.keys(obj).forEach(key => {\n            const pVal = prev[key];\n            const oVal = obj[key];\n\n            // if (Array.isArray(pVal) && Array.isArray(oVal)) {\n            //     prev[key] = pVal.concat(...oVal);\n            // }\n            if (isObject(pVal) && isObject(oVal)) {\n                prev[key] = mergeDeep(pVal, oVal);\n            }\n            else {\n                prev[key] = oVal;\n            }\n        });\n\n        return prev;\n    }, {});\n}\n\n\n// Export\n// =============================================================================\nexport default mergeDeep;\n","'use strict';\nmodule.exports = balanced;\nfunction balanced(a, b, str) {\n  if (a instanceof RegExp) a = maybeMatch(a, str);\n  if (b instanceof RegExp) b = maybeMatch(b, str);\n\n  var r = range(a, b, str);\n\n  return r && {\n    start: r[0],\n    end: r[1],\n    pre: str.slice(0, r[0]),\n    body: str.slice(r[0] + a.length, r[1]),\n    post: str.slice(r[1] + b.length)\n  };\n}\n\nfunction maybeMatch(reg, str) {\n  var m = str.match(reg);\n  return m ? m[0] : null;\n}\n\nbalanced.range = range;\nfunction range(a, b, str) {\n  var begs, beg, left, right, result;\n  var ai = str.indexOf(a);\n  var bi = str.indexOf(b, ai + 1);\n  var i = ai;\n\n  if (ai >= 0 && bi > 0) {\n    begs = [];\n    left = str.length;\n\n    while (i >= 0 && !result) {\n      if (i == ai) {\n        begs.push(i);\n        ai = str.indexOf(a, i + 1);\n      } else if (begs.length == 1) {\n        result = [ begs.pop(), bi ];\n      } else {\n        beg = begs.pop();\n        if (beg < left) {\n          left = beg;\n          right = bi;\n        }\n\n        bi = str.indexOf(b, i + 1);\n      }\n\n      i = ai < bi && ai >= 0 ? ai : bi;\n    }\n\n    if (begs.length) {\n      result = [ left, right ];\n    }\n  }\n\n  return result;\n}\n","/**\n * Based on css parser/compiler by NxChg\n * https://github.com/NxtChg/pieces/tree/master/js/css_parser\n */\n\n\n// Functions\n// =============================================================================\n/**\n * Parses CSS string and generates AST object\n *\n * @param {string} css The CSS stringt to be converted to an AST\n * @returns {object}\n */\nfunction cssParse(css) {\n    const errors = [];\n\n    // Errors\n    // -------------------------------------------------------------------------\n    function error(msg) {\n        throw new Error(`CSS parse error: ${msg}`);\n    }\n\n    // RegEx\n    // -------------------------------------------------------------------------\n    // Match regexp and return captures\n    function match(re) {\n        const m = re.exec(css);\n\n        if (m) {\n            css = css.slice(m[0].length);\n\n            return m;\n        }\n    }\n\n    function whitespace() {\n        match(/^\\s*/);\n    }\n    function open() {\n        return match(/^{\\s*/);\n    }\n    function close() {\n        return match(/^}/);\n    }\n\n    // Comments\n    // -------------------------------------------------------------------------\n    function comment() {\n        whitespace();\n\n        if (css[0] !== '/' || css[1] !== '*') { return; }\n\n        let i = 2;\n        while (css[i] && (css[i] !== '*' || css[i + 1] !== '/')) { i++; }\n\n        // FIXED\n        if (!css[i]) { return error('end of comment is missing'); }\n\n        const str = css.slice(2, i);\n        css = css.slice(i + 2);\n\n        return { type: 'comment', comment: str };\n    }\n    function comments() {\n        const cmnts = [];\n\n        let c;\n\n        while ((c = comment())) {\n            cmnts.push(c);\n        }\n        return cmnts;\n    }\n\n    // Selector\n    // -------------------------------------------------------------------------\n    function selector() {\n        whitespace();\n        while (css[0] === '}') {\n            error('extra closing bracket');\n        }\n\n        const m = match(/^((\"(?:\\\\\"|[^\"])*\"|'(?:\\\\'|[^'])*'|[^{])+)/);\n\n        if (m)\n        { return m[0]\n            .trim() // remove all comments from selectors\n            .replace(/\\/\\*([^*]|[\\r\\n]|(\\*+([^*/]|[\\r\\n])))*\\*\\/+/g, '')\n            .replace(/\"(?:\\\\\"|[^\"])*\"|'(?:\\\\'|[^'])*'/g, function(m) {\n                return m.replace(/,/g, '\\u200C');\n            })\n            .split(/\\s*(?![^(]*\\)),\\s*/)\n            .map(function(s) {\n                return s.replace(/\\u200C/g, ',');\n            }); }\n    }\n\n    // Declarations\n    // -------------------------------------------------------------------------\n    function declaration() {\n        match(/^([;\\s]*)+/); // ignore empty declarations + whitespace\n\n        const comment_regexp = /\\/\\*[^*]*\\*+([^/*][^*]*\\*+)*\\//g;\n\n        let prop = match(/^(\\*?[-#/*\\\\\\w]+(\\[[0-9a-z_-]+\\])?)\\s*/);\n        if (!prop) { return; }\n\n        prop = prop[0].trim();\n\n        if (!match(/^:\\s*/)) { return error('property missing \\':\\''); }\n\n        // Quotes regex repeats verbatim inside and outside parentheses\n        const val = match(/^((?:\\/\\*.*?\\*\\/|'(?:\\\\'|.)*?'|\"(?:\\\\\"|.)*?\"|\\((\\s*'(?:\\\\'|.)*?'|\"(?:\\\\\"|.)*?\"|[^)]*?)\\s*\\)|[^};])+)/);\n\n        const ret = { type: 'declaration', property: prop.replace(comment_regexp, ''), value: val ? val[0].replace(comment_regexp, '').trim() : '' };\n\n        match(/^[;\\s]*/);\n\n        return ret;\n    }\n    function declarations() {\n        if (!open()) { return error('missing \\'{\\''); }\n\n        let d,\n            decls = comments();\n\n        while ((d = declaration())) {\n            decls.push(d);\n            decls = decls.concat(comments());\n        }\n\n        if (!close()) { return error('missing \\'}\\''); }\n\n        return decls;\n    }\n\n    // Keyframes\n    // -------------------------------------------------------------------------\n    function keyframe() {\n        whitespace();\n\n        const vals = [];\n\n        let m;\n\n        while ((m = match(/^((\\d+\\.\\d+|\\.\\d+|\\d+)%?|[a-z]+)\\s*/))) {\n            vals.push(m[1]);\n            match(/^,\\s*/);\n        }\n\n        if (vals.length) { return { type: 'keyframe', values: vals, declarations: declarations() }; }\n    }\n    function at_keyframes() {\n        let m = match(/^@([-\\w]+)?keyframes\\s*/);\n\n        if (!m) { return; }\n\n        const vendor = m[1];\n\n        m = match(/^([-\\w]+)\\s*/);\n        if (!m) { return error('@keyframes missing name'); } // identifier\n\n        const name = m[1];\n\n        if (!open()) { return error('@keyframes missing \\'{\\''); }\n\n        let frame,\n            frames = comments();\n        while ((frame = keyframe())) {\n            frames.push(frame);\n            frames = frames.concat(comments());\n        }\n\n        if (!close()) { return error('@keyframes missing \\'}\\''); }\n\n        return { type: 'keyframes', name: name, vendor: vendor, keyframes: frames };\n    }\n\n    // @ Rules\n    // -------------------------------------------------------------------------\n    function at_page() {\n        const m = match(/^@page */);\n        if (m) {\n            const sel = selector() || [];\n            return { type: 'page', selectors: sel, declarations: declarations() };\n        }\n    }\n    function at_fontface() {\n        const m = match(/^@font-face\\s*/);\n        if (m) { return { type: 'font-face', declarations: declarations() }; }\n    }\n    function at_supports() {\n        const m = match(/^@supports *([^{]+)/);\n        if (m) { return { type: 'supports', supports: m[1].trim(), rules: rules() }; }\n    }\n    function at_host() {\n        const m = match(/^@host\\s*/);\n        if (m) { return { type: 'host', rules: rules() }; }\n    }\n    function at_media() {\n        const m = match(/^@media *([^{]+)/);\n        if (m) { return { type: 'media', media: m[1].trim(), rules: rules() }; }\n    }\n    function at_custom_m() {\n        const m = match(/^@custom-media\\s+(--[^\\s]+)\\s*([^{;]+);/);\n        if (m) { return { type: 'custom-media', name: m[1].trim(), media: m[2].trim() }; }\n    }\n    function at_document() {\n        const m = match(/^@([-\\w]+)?document *([^{]+)/);\n        // FIXED\n        if (m) { return { type: 'document', document: m[2].trim(), vendor: m[1] ? m[1].trim() : null, rules: rules() }; }\n    }\n    function at_x() {\n        const m = match(/^@(import|charset|namespace)\\s*([^;]+);/);\n        if (m) { return { type: m[1], name: m[2].trim() }; }\n    }\n    function at_rule() {\n        whitespace();\n        if (css[0] === '@') { return at_keyframes() || at_supports() || at_host() || at_media() || at_custom_m() || at_page() || at_document() || at_fontface() || at_x(); }\n    }\n\n    // Rules\n    // -------------------------------------------------------------------------\n    function rule() {\n        const sel = selector() || [];\n        if (!sel.length) { error('selector missing'); }\n\n        const decls = declarations();\n\n        return { type: 'rule', selectors: sel, declarations: decls };\n    }\n    function rules(core) {\n        if (!core && !open()) { return error('missing \\'{\\''); }\n\n        let node,\n            rules = comments();\n\n        while (css.length && (core || css[0] !== '}') && (node = at_rule() || rule())) {\n            rules.push(node);\n            rules = rules.concat(comments());\n        }\n\n        if (!core && !close()) { return error('missing \\'}\\''); }\n\n        return rules;\n    }\n\n    return { type: 'stylesheet', stylesheet: { rules: rules(true), errors: errors } };\n}\n\n\n// Exports\n// =============================================================================\nexport default cssParse;\n","/**\n * Based on css parser/compiler by NxChg\n * https://github.com/NxtChg/pieces/tree/master/js/css_parser\n */\n\n\n// Functions\n// =============================================================================\n/**\n * Compiles CSS AST to string\n *\n * @param {object}   tree CSS AST object\n * @param {string}   [delim=''] CSS rule delimiter\n * @param {function} cb Function to be called before each node is processed\n * @returns {string}\n */\nfunction stringifyCss(tree, delim = '', cb) {\n    const renderMethods = {\n        charset(node) {\n            return '@charset ' + node.name + ';';\n        },\n        comment(node) {\n            return '';\n        },\n        'custom-media'(node) {\n            return '@custom-media ' + node.name + ' ' + node.media + ';';\n        },\n        declaration(node) {\n            return node.property + ':' + node.value + ';';\n        },\n        document(node) {\n            return '@' + (node.vendor || '') + 'document ' + node.document + '{' + visit(node.rules) + '}';\n        },\n        'font-face'(node) {\n            return '@font-face' + '{' + visit(node.declarations) + '}';\n        },\n        host(node) {\n            return '@host' + '{' + visit(node.rules) + '}';\n        },\n        import(node) {\n            // FIXED\n            return '@import ' + node.name + ';';\n        },\n        keyframe(node) {\n            return node.values.join(',') + '{' + visit(node.declarations) + '}';\n        },\n        keyframes(node) {\n            return '@' + (node.vendor || '') + 'keyframes ' + node.name + '{' + visit(node.keyframes) + '}';\n        },\n        media(node) {\n            return '@media ' + node.media + '{' + visit(node.rules) + '}';\n        },\n        namespace(node) {\n            return '@namespace ' + node.name + ';';\n        },\n        page(node) {\n            return '@page ' + (node.selectors.length ? node.selectors.join(', ') : '') + '{' + visit(node.declarations) + '}';\n        },\n        rule(node) {\n            const decls = node.declarations;\n\n            if (decls.length) {\n                return node.selectors.join(',') + '{' + visit(decls) + '}';\n            }\n        },\n        supports(node) {\n            // FIXED\n            return '@supports ' + node.supports + '{' + visit(node.rules) + '}';\n        }\n    };\n\n    function visit(nodes) {\n        let buf = '';\n\n        for (let i = 0; i < nodes.length; i++) {\n            const n = nodes[i];\n\n            if (cb) {\n                cb(n);\n            }\n\n            const txt = renderMethods[n.type](n);\n\n            if (txt) {\n                buf += txt;\n\n                if (txt.length && n.selectors) {\n                    buf += delim;\n                }\n            }\n        }\n\n        return buf;\n    }\n\n    return visit(tree.stylesheet.rules);\n}\n\n\n// Exports\n// =============================================================================\nexport default stringifyCss;\n","/**\n * Based on rework-vars by reworkcss\n * https://github.com/reworkcss/rework-vars\n */\n\n\n// Dependencies\n// =============================================================================\nimport balanced     from 'balanced-match';\nimport mergeDeep    from './merge-deep';\nimport parseCss     from './parse-css';\nimport stringifyCss from './stringify-css';\n\n\n// Constants & Variables\n// =============================================================================\nconst VAR_PROP_IDENTIFIER = '--';\nconst VAR_FUNC_IDENTIFIER = 'var';\nconst reVarProp = /^--/;\nconst reVarVal  = /^var(.*)/;\n\n\n// Functions\n// =============================================================================\n/**\n * Transforms W3C-style CSS variables to static values and returns an updated\n * CSS string.\n *\n * @param {object}   cssText CSS containing variable definitions and functions\n * @param {object}   [options] Options object\n * @param {boolean}  [options.onlyVars=true] Remove declarations that do not\n *                   contain a CSS variable from the return value. Note that\n *                   @font-face and @keyframe rules require all declarations to\n *                   be returned if a CSS variable is used.\n * @param {boolean}  [options.preserve=true] Preserve CSS variable definitions\n *                   and functions in the return value, allowing \"live\" variable\n *                   updates via JavaScript to continue working in browsers with\n *                   native CSS variable support.\n * @param {object}   [options.variables={}] CSS variable definitions to include\n *                   during transformation. Can be used to add new override\n *                   exisitng definitions.\n * @param {function} [options.onWarning] Callback on each transformation\n *                   warning. Passes 1) warningMessage as an argument.\n * @returns {string}\n */\nfunction transformVars(cssText, options = {}) {\n    const defaults = {\n        onlyVars : true,\n        preserve : true,\n        variables: {},\n        onWarning() {}\n    };\n    const map      = {};\n    const settings = mergeDeep(defaults, options);\n\n    // Convert cssText to AST (this could throw errors)\n    const cssTree = parseCss(cssText);\n\n    // Remove non-vars\n    if (settings.onlyVars) {\n        cssTree.stylesheet.rules = filterVars(cssTree.stylesheet.rules);\n    }\n\n    // Define variables\n    cssTree.stylesheet.rules.forEach(function(rule) {\n        const varNameIndices = [];\n\n        if (rule.type !== 'rule') {\n            return;\n        }\n\n        // only variables declared for `:root` are supported\n        if (rule.selectors.length !== 1 || rule.selectors[0] !== ':root') {\n            return;\n        }\n\n        rule.declarations.forEach(function(decl, i) {\n            const prop = decl.property;\n            const value = decl.value;\n\n            if (prop && prop.indexOf(VAR_PROP_IDENTIFIER) === 0) {\n                map[prop] = value;\n                varNameIndices.push(i);\n            }\n        });\n\n        // optionally remove `--*` properties from the rule\n        if (!settings.preserve) {\n            for (let i = varNameIndices.length - 1; i >= 0; i--) {\n                rule.declarations.splice(varNameIndices[i], 1);\n            }\n        }\n    });\n\n    // Handle variables defined in settings.variables\n    if (Object.keys(settings.variables).length) {\n        const newRule = {\n            declarations: [],\n            selectors   : [':root'],\n            type        : 'rule'\n        };\n\n        Object.keys(settings.variables).forEach(function(key) {\n            // Normalize variables by ensuring all start with leading '--'\n            const varName  = `--${key.replace(/^-+/, '')}`;\n            const varValue = settings.variables[key];\n\n            // Update internal map value with settings.variables value\n            map[varName] = varValue;\n\n            // Add new declaration to newRule\n            newRule.declarations.push({\n                type    : 'declaration',\n                property: varName,\n                value   : varValue\n            });\n        });\n\n        // Append new :root ruleset\n        if (settings.preserve) {\n            cssTree.stylesheet.rules.push(newRule);\n        }\n    }\n\n    // Resolve variables\n    walkCss(cssTree.stylesheet, function(declarations, node) {\n        let decl;\n        let resolvedValue;\n        let value;\n\n        for (let i = 0; i < declarations.length; i++) {\n            decl = declarations[i];\n            value = decl.value;\n\n            // skip comments\n            if (decl.type !== 'declaration') {\n                continue;\n            }\n\n            // skip values that don't contain variable functions\n            if (!value || value.indexOf(VAR_FUNC_IDENTIFIER + '(') === -1) {\n                continue;\n            }\n\n            resolvedValue = resolveValue(value, map, settings);\n\n            if (resolvedValue !== 'undefined') {\n                if (!settings.preserve) {\n                    decl.value = resolvedValue;\n                }\n                else {\n                    declarations.splice(i, 0, {\n                        type    : decl.type,\n                        property: decl.property,\n                        value   : resolvedValue\n                    });\n\n                    // skip ahead of preserved declaration\n                    i++;\n                }\n            }\n        }\n    });\n\n    // Return CSS string\n    return stringifyCss(cssTree);\n}\n\n\n// Functions (Private)\n// =============================================================================\n/**\n * Filters rules recursively, retaining only declarations that contain either a\n * CSS variable definition (property) or function (value). Maintains all\n * declarations for @font-face and @keyframes rules that contain a CSS\n * definition or function.\n *\n * @param {array} rules\n * @returns {array}\n */\nfunction filterVars(rules) {\n    return rules.filter(rule => {\n        // Rule, @font-face, @host, @page\n        if (rule.declarations) {\n            // @font-face rules require all declarations to be retained if any\n            // declaration contains a CSS variable definition or value.\n            // For other rules, any declaration that does not contain a CSS\n            // variable can be removed.\n            let declArray = rule.type === 'font-face' ? [] : rule.declarations;\n\n            declArray = rule.declarations.filter(d => reVarProp.test(d.property) || reVarVal.test(d.value));\n\n            return Boolean(declArray.length);\n        }\n        // @keyframes\n        else if (rule.keyframes) {\n            // @keyframe rules require all declarations to be retained if any\n            // declaration contains a CSS variable definition or value.\n            return Boolean(rule.keyframes.filter(k =>\n                Boolean(k.declarations.filter(d => reVarProp.test(d.property) || reVarVal.test(d.value)).length)\n            ).length);\n        }\n        // @document, @media, @supports\n        else if (rule.rules) {\n            rule.rules = filterVars(rule.rules).filter(r => r.declarations.length);\n\n            return Boolean(rule.rules.length);\n        }\n\n        return true;\n    });\n}\n\n/**\n * Resolve CSS variables in a value\n *\n * The second argument to a CSS variable function, if provided, is a fallback\n * value, which is used as the substitution value when the referenced variable\n * is invalid.\n *\n * var(name[, fallback])\n *\n * @param {string} value A property value containing a CSS variable function\n * @param {object} map A map of variable names and values\n * @param {object} settings Settings object passed from transformVars()\n * @return {string} A new value with CSS variables substituted or using fallback\n */\nfunction resolveValue(value, map, settings) {\n    // matches `name[, fallback]`, captures 'name' and 'fallback'\n    const RE_VAR = /([\\w-]+)(?:\\s*,\\s*)?(.*)?/;\n    const balancedParens = balanced('(', ')', value);\n    const varStartIndex  = value.indexOf('var(');\n    const varRef         = balanced('(', ')', value.substring(varStartIndex)).body;\n    const warningIntro   = 'CSS transform warning:';\n\n    /* istanbul ignore next */\n    if (!balancedParens) {\n        settings.onWarning(`${warningIntro} missing closing \")\" in the value \"${value}\"`);\n    }\n\n    /* istanbul ignore next */\n    if (varRef === '') {\n        settings.onWarning(`${warningIntro} var() must contain a non-whitespace string`);\n    }\n\n    const varFunc = VAR_FUNC_IDENTIFIER + '(' + varRef + ')';\n\n    const varResult = varRef.replace(RE_VAR, function(_, name, fallback) {\n        const replacement = map[name];\n\n        if (!replacement && !fallback) {\n            settings.onWarning(`${warningIntro} variable \"${name}\" is undefined`);\n        }\n\n        if (!replacement && fallback) {\n            return fallback;\n        }\n\n        return replacement;\n    });\n\n    // resolve the variable\n    value = value.split(varFunc).join(varResult);\n\n    // recursively resolve any remaining variables in the value\n    if (value.indexOf(VAR_FUNC_IDENTIFIER) !== -1) {\n        value = resolveValue(value, map, settings);\n    }\n\n    return value;\n}\n\n/**\n * Visit `node` declarations recursively and invoke `fn(declarations, node)`.\n *\n * Based on rework-visit by reworkcss\n * https://github.com/reworkcss/rework-visit\n *\n * @param {object} node\n * @param {function} fn\n */\nfunction walkCss(node, fn){\n    node.rules.forEach(function(rule){\n        // @media etc\n        if (rule.rules) {\n            walkCss(rule, fn);\n\n            return;\n        }\n\n        // keyframes\n        if (rule.keyframes) {\n            rule.keyframes.forEach(function(keyframe){\n                if (keyframe.type === 'keyframe') {\n                    fn(keyframe.declarations, rule);\n                }\n            });\n\n            return;\n        }\n\n        // @charset, @import etc\n        if (!rule.declarations) {\n            return;\n        }\n\n        fn(rule.declarations, node);\n    });\n}\n\n\n// Exports\n// =============================================================================\nexport default transformVars;\n","// Dependencies\n// =============================================================================\nimport getCssData          from 'get-css-data';\nimport mergeDeep           from './merge-deep';\nimport transformCss        from './transform-css';\nimport { name as pkgName } from '../package.json';\n\n\n// Constants & Variables\n// =============================================================================\nconst defaults = {\n    // Sources\n    include    : 'style,link[rel=stylesheet]',\n    exclude    : '',\n    // Options\n    appendStyle: true,  // cssVars\n    onlyLegacy : true,  // cssVars\n    onlyVars   : true,  // cssVars, transformCss\n    preserve   : true,  // transformCss\n    silent     : false, // cssVars\n    variables  : {},    // transformCss\n    // Callbacks\n    onSuccess() {},     // cssVars\n    onError() {},       // cssVars\n    onWarning() {},     // transformCss\n    onComplete() {}     // cssVars\n};\n// Regex: CSS variable :root declarations and var() function values\nconst reCssVars = /(?:(?::root\\s*{\\s*[^;]*;*\\s*)|(?:var\\(\\s*))(--[^:)]+)(?:\\s*[:)])/;\n\n\n\n\n// Functions\n// =============================================================================\n/**\n * Description\n *\n * @preserve\n * @param {object}   [options] Options object\n * @param {string}   [options.include=\"style,link[rel=stylesheet]\"] CSS selector\n *                   matching <link> and <style> nodes to include\n * @param {string}   [options.exclude=\"\"] CSS selector matching <link> and\n *                   <style> nodes to exclude\n * @param {boolean}  [options.appendStyle=true] Append <style> node containing\n *                   updated CSS to DOM\n * @param {boolean}  [options.onlyLegacy=true] Only process CSS variables in\n *                   browsers that lack native support\n * @param {boolean}  [options.onlyVars=true] Remove declarations that do not\n *                   contain a CSS variable from the return value. Note that\n *                   font-face and keyframe rules require all declarations to be\n *                   returned if a CSS variable is used.\n * @param {boolean}  [options.preserve=true] Preserve CSS variable definitions\n *                   and functions in the return value, allowing \"live\" variable\n *                   updates via JavaScript to continue working in browsers with\n *                   native CSS variable support.\n * @param {boolean}  [options.silent=false] Prevent console warnign and error\n *                   messages\n * @param {object}   [options.variables={}] CSS variable definitions to include\n *                   during transformation. Can be used to add new override\n *                   exisitng definitions.\n * @param {function} [options.onSuccess] Callback after all stylesheets have\n *                   been processed succesfully. Passes 1) a CSS string with CSS\n *                   variable values resolved as an argument. Modifying the CSS\n *                   appended when 'appendStyle' is 'true' can be done by\n *                   returning a string value from this funtion (or 'false' to\n *                   skip).\n * @param {function} [options.onError] Callback on each error. Passes 1) an\n *                   error message, and 2) source node reference as arguments.\n * @param {function} [options.onWarning] Callback on each warning. Passes 1) a\n *                   warning message as an argument.\n * @param {function} [options.onComplete] Callback after all stylesheets have\n *                   been processed succesfully and <style> node containing\n *                   updated CSS has been appended to the DOM (based on\n *                   'appendStyle' setting. 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Store the onSuccess return value,\n                        // which allows modifying cssText before passing to\n                        // onComplete and/or appending to new <style> node.\n                        const returnVal = settings.onSuccess(cssText);\n\n                        // Set cssText to return value (if provided)\n                        cssText = returnVal === false ? 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\ No newline at end of file
diff --git a/dist/css-vars-ponyfill.js b/dist/css-vars-ponyfill.js
new file mode 100644
index 0000000..c7099c6
--- /dev/null
+++ b/dist/css-vars-ponyfill.js
@@ -0,0 +1,958 @@
+/*!
+ * css-vars-ponyfill
+ * v0.0.1
+ * https://github.com/jhildenbiddle/css-vars-ponyfill
+ * (c) 2018 John Hildenbiddle <http://hildenbiddle.com>
+ * MIT license
+ */
+(function(global, factory) {
+    typeof exports === "object" && typeof module !== "undefined" ? module.exports = factory() : typeof define === "function" && define.amd ? define(factory) : global.cssVars = factory();
+})(this, function() {
+    "use strict";
+    /*!
+ * get-css-data
+ * v1.1.1
+ * https://github.com/jhildenbiddle/get-css-data
+ * (c) 2018 John Hildenbiddle <http://hildenbiddle.com>
+ * MIT license
+ */    function getUrls(urls) {
+        var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
+        var settings = {
+            mimeType: options.mimeType || null,
+            onComplete: options.onComplete || Function.prototype,
+            onError: options.onError || Function.prototype,
+            onSuccess: options.onSuccess || Function.prototype
+        };
+        var urlArray = Array.isArray(urls) ? urls : [ urls ];
+        var urlQueue = Array.apply(null, Array(urlArray.length)).map(function(x) {
+            return null;
+        });
+        function onError(xhr, urlIndex) {
+            settings.onError(xhr, urlArray[urlIndex], urlIndex);
+        }
+        function onSuccess(responseText, urlIndex) {
+            urlQueue[urlIndex] = responseText;
+            settings.onSuccess(responseText, urlArray[urlIndex], urlIndex);
+            if (urlQueue.indexOf(null) === -1) {
+                settings.onComplete(urlQueue);
+            }
+        }
+        urlArray.forEach(function(url, i) {
+            var parser = document.createElement("a");
+            parser.setAttribute("href", url);
+            parser.href = parser.href;
+            var isCrossDomain = parser.host !== location.host;
+            var isSameProtocol = parser.protocol === location.protocol;
+            if (isCrossDomain && typeof XDomainRequest !== "undefined") {
+                if (isSameProtocol) {
+                    var xdr = new XDomainRequest();
+                    xdr.open("GET", url);
+                    xdr.timeout = 0;
+                    xdr.onprogress = Function.prototype;
+                    xdr.ontimeout = Function.prototype;
+                    xdr.onload = function() {
+                        onSuccess(xdr.responseText, i);
+                    };
+                    xdr.onerror = function(err) {
+                        onError(xdr, i);
+                    };
+                    setTimeout(function() {
+                        xdr.send();
+                    }, 0);
+                } else {
+                    console.log("Internet Explorer 9 Cross-Origin (CORS) requests must use the same protocol");
+                    onError(null, i);
+                }
+            } else {
+                var xhr = new XMLHttpRequest();
+                xhr.open("GET", url);
+                if (settings.mimeType && xhr.overrideMimeType) {
+                    xhr.overrideMimeType(settings.mimeType);
+                }
+                xhr.onreadystatechange = function() {
+                    if (xhr.readyState === 4) {
+                        if (xhr.status === 200) {
+                            onSuccess(xhr.responseText, i);
+                        } else {
+                            onError(xhr, i);
+                        }
+                    }
+                };
+                xhr.send();
+            }
+        });
+    }
+    /**
+ * Gets CSS data from <style> and <link> nodes (including @imports), then
+ * returns data in order processed by DOM. Allows specifying nodes to
+ * include/exclude and filtering CSS data using RegEx.
+ *
+ * @preserve
+ * @param {object} [options={}] - The options object
+ * @param {string} options.include - CSS selector matching <link> and <style>
+ * nodes to include
+ * @param {string} options.exclude - CSS selector matching <link> and <style>
+ * nodes to exclude
+ * @param {object} options.filter - Regular expression used to filter node CSS
+ * data. Each block of CSS data is tested against the filter, and only matching
+ * data is included.
+ * @param {function} options.onComplete - Callback after all nodes have been
+ * processed. Passes 1) concatenated CSS text, 2) an array of CSS text in DOM
+ * order, and 3) an array of nodes in DOM order as arguments.
+ * @param {function} options.onError - Callback on each error. Passes 1) the XHR
+ * object for inspection, 2) soure node reference, and 3) the source URL that
+ * failed (either a <link> href or an @import) as arguments
+ * @param {function} options.onSuccess - Callback on each CSS node read. Passes
+ * 1) CSS text, 2) source node reference, and 3) the source URL (either a <link>
+ *    href or an import) as arguments.
+ * @example
+ *
+ *   getCssData({
+ *     include: 'style,link[rel="stylesheet"]', // default
+ *     exclude: '[href="skip.css"]',
+ *     filter : /red/,
+ *     onComplete(cssText, cssArray) {
+ *       // ...
+ *     },
+ *     onError(xhr, node, url) {
+ *       // ...
+ *     },
+ *     onSuccess(cssText, node, url) {
+ *       // ...
+ *     }
+ *   });
+ */    function getCssData(options) {
+        var regex = {
+            cssComments: /\/\*[\s\S]+?\*\//g,
+            cssImports: /(?:@import\s*)(?:url\(\s*)?(?:['"])([^'"]*)(?:['"])(?:\s*\))?(?:[^;]*;)/g
+        };
+        var settings = {
+            include: options.include || 'style,link[rel="stylesheet"]',
+            exclude: options.exclude || null,
+            filter: options.filter || null,
+            onComplete: options.onComplete || Function.prototype,
+            onError: options.onError || Function.prototype,
+            onSuccess: options.onSuccess || Function.prototype
+        };
+        var sourceNodes = Array.apply(null, document.querySelectorAll(settings.include)).filter(function(node) {
+            return !matchesSelector(node, settings.exclude);
+        });
+        var cssArray = Array.apply(null, Array(sourceNodes.length)).map(function(x) {
+            return null;
+        });
+        function handleComplete() {
+            var isComplete = cssArray.indexOf(null) === -1;
+            if (isComplete) {
+                var cssText = cssArray.join("");
+                settings.onComplete(cssText, cssArray, sourceNodes);
+            }
+        }
+        function handleError(xhr, node, url, cssIndex) {
+            var cssText = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : "";
+            cssArray[cssIndex] = cssText;
+            settings.onError(xhr, node, url);
+            handleComplete();
+        }
+        function handleSuccess(cssText, cssIndex, node, sourceUrl, importUrl) {
+            if (!settings.filter || settings.filter.test(cssText)) {
+                var returnVal = settings.onSuccess(cssText, node, importUrl || sourceUrl);
+                cssText = returnVal === false ? "" : returnVal || cssText;
+                var importRules = cssText.replace(regex.cssComments, "").match(regex.cssImports);
+                if (importRules) {
+                    var importUrls = importRules.map(function(decl) {
+                        return decl.replace(regex.cssImports, "$1");
+                    });
+                    importUrls = importUrls.map(function(url) {
+                        return getFullUrl(url, sourceUrl);
+                    });
+                    getUrls(importUrls, {
+                        onError: function onError(xhr, url, urlIndex) {
+                            handleError(xhr, node, url, cssIndex, cssText);
+                        },
+                        onSuccess: function onSuccess(importText, url, urlIndex) {
+                            var importDecl = importRules[urlIndex];
+                            var importUrl = importUrls[urlIndex];
+                            var newCssText = cssText.replace(importDecl, importText);
+                            handleSuccess(newCssText, cssIndex, node, url, importUrl);
+                        }
+                    });
+                } else {
+                    cssArray[cssIndex] = cssText;
+                    handleComplete();
+                }
+            } else {
+                cssArray[cssIndex] = "";
+                handleComplete();
+            }
+        }
+        if (sourceNodes.length) {
+            sourceNodes.forEach(function(node, i) {
+                var linkHref = node.getAttribute("href");
+                var linkRel = node.getAttribute("rel");
+                var isLink = node.nodeName === "LINK" && linkHref && linkRel && linkRel.toLowerCase() === "stylesheet";
+                var isStyle = node.nodeName === "STYLE";
+                if (isLink) {
+                    getUrls(linkHref, {
+                        mimeType: "text/css",
+                        onError: function onError(xhr, url, urlIndex) {
+                            handleError(xhr, node, url, i);
+                        },
+                        onSuccess: function onSuccess(cssText, url, urlIndex) {
+                            var sourceUrl = getFullUrl(linkHref, location.href);
+                            handleSuccess(cssText, i, node, sourceUrl);
+                        }
+                    });
+                } else if (isStyle) {
+                    handleSuccess(node.textContent, i, node, location.href);
+                } else {
+                    cssArray[i] = "";
+                    handleComplete();
+                }
+            });
+        } else {
+            settings.onComplete("", []);
+        }
+    }
+    function getFullUrl(url) {
+        var base = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : location.href;
+        var d = document.implementation.createHTMLDocument("");
+        var b = d.createElement("base");
+        var a = d.createElement("a");
+        d.head.appendChild(b);
+        d.body.appendChild(a);
+        b.href = base;
+        a.href = url;
+        return a.href;
+    }
+    function matchesSelector(elm, selector) {
+        var matches = elm.matches || elm.matchesSelector || elm.webkitMatchesSelector || elm.mozMatchesSelector || elm.msMatchesSelector || elm.oMatchesSelector;
+        return matches.call(elm, selector);
+    }
+    function mergeDeep() {
+        var isObject = function isObject(obj) {
+            return obj instanceof Object && obj.constructor === Object;
+        };
+        for (var _len = arguments.length, objects = Array(_len), _key = 0; _key < _len; _key++) {
+            objects[_key] = arguments[_key];
+        }
+        return objects.reduce(function(prev, obj) {
+            Object.keys(obj).forEach(function(key) {
+                var pVal = prev[key];
+                var oVal = obj[key];
+                if (isObject(pVal) && isObject(oVal)) {
+                    prev[key] = mergeDeep(pVal, oVal);
+                } else {
+                    prev[key] = oVal;
+                }
+            });
+            return prev;
+        }, {});
+    }
+    var balancedMatch = balanced;
+    function balanced(a, b, str) {
+        if (a instanceof RegExp) a = maybeMatch(a, str);
+        if (b instanceof RegExp) b = maybeMatch(b, str);
+        var r = range(a, b, str);
+        return r && {
+            start: r[0],
+            end: r[1],
+            pre: str.slice(0, r[0]),
+            body: str.slice(r[0] + a.length, r[1]),
+            post: str.slice(r[1] + b.length)
+        };
+    }
+    function maybeMatch(reg, str) {
+        var m = str.match(reg);
+        return m ? m[0] : null;
+    }
+    balanced.range = range;
+    function range(a, b, str) {
+        var begs, beg, left, right, result;
+        var ai = str.indexOf(a);
+        var bi = str.indexOf(b, ai + 1);
+        var i = ai;
+        if (ai >= 0 && bi > 0) {
+            begs = [];
+            left = str.length;
+            while (i >= 0 && !result) {
+                if (i == ai) {
+                    begs.push(i);
+                    ai = str.indexOf(a, i + 1);
+                } else if (begs.length == 1) {
+                    result = [ begs.pop(), bi ];
+                } else {
+                    beg = begs.pop();
+                    if (beg < left) {
+                        left = beg;
+                        right = bi;
+                    }
+                    bi = str.indexOf(b, i + 1);
+                }
+                i = ai < bi && ai >= 0 ? ai : bi;
+            }
+            if (begs.length) {
+                result = [ left, right ];
+            }
+        }
+        return result;
+    }
+    function cssParse(css) {
+        var errors = [];
+        function error(msg) {
+            throw new Error("CSS parse error: " + msg);
+        }
+        function match(re) {
+            var m = re.exec(css);
+            if (m) {
+                css = css.slice(m[0].length);
+                return m;
+            }
+        }
+        function whitespace() {
+            match(/^\s*/);
+        }
+        function open() {
+            return match(/^{\s*/);
+        }
+        function close() {
+            return match(/^}/);
+        }
+        function comment() {
+            whitespace();
+            if (css[0] !== "/" || css[1] !== "*") {
+                return;
+            }
+            var i = 2;
+            while (css[i] && (css[i] !== "*" || css[i + 1] !== "/")) {
+                i++;
+            }
+            if (!css[i]) {
+                return error("end of comment is missing");
+            }
+            var str = css.slice(2, i);
+            css = css.slice(i + 2);
+            return {
+                type: "comment",
+                comment: str
+            };
+        }
+        function comments() {
+            var cmnts = [];
+            var c = void 0;
+            while (c = comment()) {
+                cmnts.push(c);
+            }
+            return cmnts;
+        }
+        function selector() {
+            whitespace();
+            while (css[0] === "}") {
+                error("extra closing bracket");
+            }
+            var m = match(/^(("(?:\\"|[^"])*"|'(?:\\'|[^'])*'|[^{])+)/);
+            if (m) {
+                return m[0].trim().replace(/\/\*([^*]|[\r\n]|(\*+([^*/]|[\r\n])))*\*\/+/g, "").replace(/"(?:\\"|[^"])*"|'(?:\\'|[^'])*'/g, function(m) {
+                    return m.replace(/,/g, "‌");
+                }).split(/\s*(?![^(]*\)),\s*/).map(function(s) {
+                    return s.replace(/\u200C/g, ",");
+                });
+            }
+        }
+        function declaration() {
+            match(/^([;\s]*)+/);
+            var comment_regexp = /\/\*[^*]*\*+([^/*][^*]*\*+)*\//g;
+            var prop = match(/^(\*?[-#/*\\\w]+(\[[0-9a-z_-]+\])?)\s*/);
+            if (!prop) {
+                return;
+            }
+            prop = prop[0].trim();
+            if (!match(/^:\s*/)) {
+                return error("property missing ':'");
+            }
+            var val = match(/^((?:\/\*.*?\*\/|'(?:\\'|.)*?'|"(?:\\"|.)*?"|\((\s*'(?:\\'|.)*?'|"(?:\\"|.)*?"|[^)]*?)\s*\)|[^};])+)/);
+            var ret = {
+                type: "declaration",
+                property: prop.replace(comment_regexp, ""),
+                value: val ? val[0].replace(comment_regexp, "").trim() : ""
+            };
+            match(/^[;\s]*/);
+            return ret;
+        }
+        function declarations() {
+            if (!open()) {
+                return error("missing '{'");
+            }
+            var d = void 0, decls = comments();
+            while (d = declaration()) {
+                decls.push(d);
+                decls = decls.concat(comments());
+            }
+            if (!close()) {
+                return error("missing '}'");
+            }
+            return decls;
+        }
+        function keyframe() {
+            whitespace();
+            var vals = [];
+            var m = void 0;
+            while (m = match(/^((\d+\.\d+|\.\d+|\d+)%?|[a-z]+)\s*/)) {
+                vals.push(m[1]);
+                match(/^,\s*/);
+            }
+            if (vals.length) {
+                return {
+                    type: "keyframe",
+                    values: vals,
+                    declarations: declarations()
+                };
+            }
+        }
+        function at_keyframes() {
+            var m = match(/^@([-\w]+)?keyframes\s*/);
+            if (!m) {
+                return;
+            }
+            var vendor = m[1];
+            m = match(/^([-\w]+)\s*/);
+            if (!m) {
+                return error("@keyframes missing name");
+            }
+            var name = m[1];
+            if (!open()) {
+                return error("@keyframes missing '{'");
+            }
+            var frame = void 0, frames = comments();
+            while (frame = keyframe()) {
+                frames.push(frame);
+                frames = frames.concat(comments());
+            }
+            if (!close()) {
+                return error("@keyframes missing '}'");
+            }
+            return {
+                type: "keyframes",
+                name: name,
+                vendor: vendor,
+                keyframes: frames
+            };
+        }
+        function at_page() {
+            var m = match(/^@page */);
+            if (m) {
+                var sel = selector() || [];
+                return {
+                    type: "page",
+                    selectors: sel,
+                    declarations: declarations()
+                };
+            }
+        }
+        function at_fontface() {
+            var m = match(/^@font-face\s*/);
+            if (m) {
+                return {
+                    type: "font-face",
+                    declarations: declarations()
+                };
+            }
+        }
+        function at_supports() {
+            var m = match(/^@supports *([^{]+)/);
+            if (m) {
+                return {
+                    type: "supports",
+                    supports: m[1].trim(),
+                    rules: rules()
+                };
+            }
+        }
+        function at_host() {
+            var m = match(/^@host\s*/);
+            if (m) {
+                return {
+                    type: "host",
+                    rules: rules()
+                };
+            }
+        }
+        function at_media() {
+            var m = match(/^@media *([^{]+)/);
+            if (m) {
+                return {
+                    type: "media",
+                    media: m[1].trim(),
+                    rules: rules()
+                };
+            }
+        }
+        function at_custom_m() {
+            var m = match(/^@custom-media\s+(--[^\s]+)\s*([^{;]+);/);
+            if (m) {
+                return {
+                    type: "custom-media",
+                    name: m[1].trim(),
+                    media: m[2].trim()
+                };
+            }
+        }
+        function at_document() {
+            var m = match(/^@([-\w]+)?document *([^{]+)/);
+            if (m) {
+                return {
+                    type: "document",
+                    document: m[2].trim(),
+                    vendor: m[1] ? m[1].trim() : null,
+                    rules: rules()
+                };
+            }
+        }
+        function at_x() {
+            var m = match(/^@(import|charset|namespace)\s*([^;]+);/);
+            if (m) {
+                return {
+                    type: m[1],
+                    name: m[2].trim()
+                };
+            }
+        }
+        function at_rule() {
+            whitespace();
+            if (css[0] === "@") {
+                return at_keyframes() || at_supports() || at_host() || at_media() || at_custom_m() || at_page() || at_document() || at_fontface() || at_x();
+            }
+        }
+        function rule() {
+            var sel = selector() || [];
+            if (!sel.length) {
+                error("selector missing");
+            }
+            var decls = declarations();
+            return {
+                type: "rule",
+                selectors: sel,
+                declarations: decls
+            };
+        }
+        function rules(core) {
+            if (!core && !open()) {
+                return error("missing '{'");
+            }
+            var node = void 0, rules = comments();
+            while (css.length && (core || css[0] !== "}") && (node = at_rule() || rule())) {
+                rules.push(node);
+                rules = rules.concat(comments());
+            }
+            if (!core && !close()) {
+                return error("missing '}'");
+            }
+            return rules;
+        }
+        return {
+            type: "stylesheet",
+            stylesheet: {
+                rules: rules(true),
+                errors: errors
+            }
+        };
+    }
+    function stringifyCss(tree) {
+        var delim = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : "";
+        var cb = arguments[2];
+        var renderMethods = {
+            charset: function charset(node) {
+                return "@charset " + node.name + ";";
+            },
+            comment: function comment(node) {
+                return "";
+            },
+            "custom-media": function customMedia(node) {
+                return "@custom-media " + node.name + " " + node.media + ";";
+            },
+            declaration: function declaration(node) {
+                return node.property + ":" + node.value + ";";
+            },
+            document: function document(node) {
+                return "@" + (node.vendor || "") + "document " + node.document + "{" + visit(node.rules) + "}";
+            },
+            "font-face": function fontFace(node) {
+                return "@font-face" + "{" + visit(node.declarations) + "}";
+            },
+            host: function host(node) {
+                return "@host" + "{" + visit(node.rules) + "}";
+            },
+            import: function _import(node) {
+                return "@import " + node.name + ";";
+            },
+            keyframe: function keyframe(node) {
+                return node.values.join(",") + "{" + visit(node.declarations) + "}";
+            },
+            keyframes: function keyframes(node) {
+                return "@" + (node.vendor || "") + "keyframes " + node.name + "{" + visit(node.keyframes) + "}";
+            },
+            media: function media(node) {
+                return "@media " + node.media + "{" + visit(node.rules) + "}";
+            },
+            namespace: function namespace(node) {
+                return "@namespace " + node.name + ";";
+            },
+            page: function page(node) {
+                return "@page " + (node.selectors.length ? node.selectors.join(", ") : "") + "{" + visit(node.declarations) + "}";
+            },
+            rule: function rule(node) {
+                var decls = node.declarations;
+                if (decls.length) {
+                    return node.selectors.join(",") + "{" + visit(decls) + "}";
+                }
+            },
+            supports: function supports(node) {
+                return "@supports " + node.supports + "{" + visit(node.rules) + "}";
+            }
+        };
+        function visit(nodes) {
+            var buf = "";
+            for (var i = 0; i < nodes.length; i++) {
+                var n = nodes[i];
+                if (cb) {
+                    cb(n);
+                }
+                var txt = renderMethods[n.type](n);
+                if (txt) {
+                    buf += txt;
+                    if (txt.length && n.selectors) {
+                        buf += delim;
+                    }
+                }
+            }
+            return buf;
+        }
+        return visit(tree.stylesheet.rules);
+    }
+    var VAR_PROP_IDENTIFIER = "--";
+    var VAR_FUNC_IDENTIFIER = "var";
+    var reVarProp = /^--/;
+    var reVarVal = /^var(.*)/;
+    function transformVars(cssText) {
+        var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
+        var defaults = {
+            onlyVars: true,
+            preserve: true,
+            variables: {},
+            onWarning: function onWarning() {}
+        };
+        var map = {};
+        var settings = mergeDeep(defaults, options);
+        var cssTree = cssParse(cssText);
+        if (settings.onlyVars) {
+            cssTree.stylesheet.rules = filterVars(cssTree.stylesheet.rules);
+        }
+        cssTree.stylesheet.rules.forEach(function(rule) {
+            var varNameIndices = [];
+            if (rule.type !== "rule") {
+                return;
+            }
+            if (rule.selectors.length !== 1 || rule.selectors[0] !== ":root") {
+                return;
+            }
+            rule.declarations.forEach(function(decl, i) {
+                var prop = decl.property;
+                var value = decl.value;
+                if (prop && prop.indexOf(VAR_PROP_IDENTIFIER) === 0) {
+                    map[prop] = value;
+                    varNameIndices.push(i);
+                }
+            });
+            if (!settings.preserve) {
+                for (var i = varNameIndices.length - 1; i >= 0; i--) {
+                    rule.declarations.splice(varNameIndices[i], 1);
+                }
+            }
+        });
+        if (Object.keys(settings.variables).length) {
+            var newRule = {
+                declarations: [],
+                selectors: [ ":root" ],
+                type: "rule"
+            };
+            Object.keys(settings.variables).forEach(function(key) {
+                var varName = "--" + key.replace(/^-+/, "");
+                var varValue = settings.variables[key];
+                map[varName] = varValue;
+                newRule.declarations.push({
+                    type: "declaration",
+                    property: varName,
+                    value: varValue
+                });
+            });
+            if (settings.preserve) {
+                cssTree.stylesheet.rules.push(newRule);
+            }
+        }
+        walkCss(cssTree.stylesheet, function(declarations, node) {
+            var decl = void 0;
+            var resolvedValue = void 0;
+            var value = void 0;
+            for (var i = 0; i < declarations.length; i++) {
+                decl = declarations[i];
+                value = decl.value;
+                if (decl.type !== "declaration") {
+                    continue;
+                }
+                if (!value || value.indexOf(VAR_FUNC_IDENTIFIER + "(") === -1) {
+                    continue;
+                }
+                resolvedValue = resolveValue(value, map, settings);
+                if (resolvedValue !== "undefined") {
+                    if (!settings.preserve) {
+                        decl.value = resolvedValue;
+                    } else {
+                        declarations.splice(i, 0, {
+                            type: decl.type,
+                            property: decl.property,
+                            value: resolvedValue
+                        });
+                        i++;
+                    }
+                }
+            }
+        });
+        return stringifyCss(cssTree);
+    }
+    function filterVars(rules) {
+        return rules.filter(function(rule) {
+            if (rule.declarations) {
+                var declArray = rule.type === "font-face" ? [] : rule.declarations;
+                declArray = rule.declarations.filter(function(d) {
+                    return reVarProp.test(d.property) || reVarVal.test(d.value);
+                });
+                return Boolean(declArray.length);
+            } else if (rule.keyframes) {
+                return Boolean(rule.keyframes.filter(function(k) {
+                    return Boolean(k.declarations.filter(function(d) {
+                        return reVarProp.test(d.property) || reVarVal.test(d.value);
+                    }).length);
+                }).length);
+            } else if (rule.rules) {
+                rule.rules = filterVars(rule.rules).filter(function(r) {
+                    return r.declarations.length;
+                });
+                return Boolean(rule.rules.length);
+            }
+            return true;
+        });
+    }
+    function resolveValue(value, map, settings) {
+        var RE_VAR = /([\w-]+)(?:\s*,\s*)?(.*)?/;
+        var balancedParens = balancedMatch("(", ")", value);
+        var varStartIndex = value.indexOf("var(");
+        var varRef = balancedMatch("(", ")", value.substring(varStartIndex)).body;
+        var warningIntro = "CSS transform warning:";
+        if (!balancedParens) {
+            settings.onWarning(warningIntro + ' missing closing ")" in the value "' + value + '"');
+        }
+        if (varRef === "") {
+            settings.onWarning(warningIntro + " var() must contain a non-whitespace string");
+        }
+        var varFunc = VAR_FUNC_IDENTIFIER + "(" + varRef + ")";
+        var varResult = varRef.replace(RE_VAR, function(_, name, fallback) {
+            var replacement = map[name];
+            if (!replacement && !fallback) {
+                settings.onWarning(warningIntro + ' variable "' + name + '" is undefined');
+            }
+            if (!replacement && fallback) {
+                return fallback;
+            }
+            return replacement;
+        });
+        value = value.split(varFunc).join(varResult);
+        if (value.indexOf(VAR_FUNC_IDENTIFIER) !== -1) {
+            value = resolveValue(value, map, settings);
+        }
+        return value;
+    }
+    function walkCss(node, fn) {
+        node.rules.forEach(function(rule) {
+            if (rule.rules) {
+                walkCss(rule, fn);
+                return;
+            }
+            if (rule.keyframes) {
+                rule.keyframes.forEach(function(keyframe) {
+                    if (keyframe.type === "keyframe") {
+                        fn(keyframe.declarations, rule);
+                    }
+                });
+                return;
+            }
+            if (!rule.declarations) {
+                return;
+            }
+            fn(rule.declarations, node);
+        });
+    }
+    var name = "css-vars-ponyfill";
+    var defaults = {
+        include: "style,link[rel=stylesheet]",
+        exclude: "",
+        appendStyle: true,
+        onlyLegacy: true,
+        onlyVars: true,
+        preserve: true,
+        silent: false,
+        variables: {},
+        onSuccess: function onSuccess() {},
+        onError: function onError() {},
+        onWarning: function onWarning() {},
+        onComplete: function onComplete() {}
+    };
+    var reCssVars = /(?:(?::root\s*{\s*[^;]*;*\s*)|(?:var\(\s*))(--[^:)]+)(?:\s*[:)])/;
+    /**
+ * Description
+ *
+ * @preserve
+ * @param {object}   [options] Options object
+ * @param {string}   [options.include="style,link[rel=stylesheet]"] CSS selector
+ *                   matching <link> and <style> nodes to include
+ * @param {string}   [options.exclude=""] CSS selector matching <link> and
+ *                   <style> nodes to exclude
+ * @param {boolean}  [options.appendStyle=true] Append <style> node containing
+ *                   updated CSS to DOM
+ * @param {boolean}  [options.onlyLegacy=true] Only process CSS variables in
+ *                   browsers that lack native support
+ * @param {boolean}  [options.onlyVars=true] Remove declarations that do not
+ *                   contain a CSS variable from the return value. Note that
+ *                   font-face and keyframe rules require all declarations to be
+ *                   returned if a CSS variable is used.
+ * @param {boolean}  [options.preserve=true] Preserve CSS variable definitions
+ *                   and functions in the return value, allowing "live" variable
+ *                   updates via JavaScript to continue working in browsers with
+ *                   native CSS variable support.
+ * @param {boolean}  [options.silent=false] Prevent console warnign and error
+ *                   messages
+ * @param {object}   [options.variables={}] CSS variable definitions to include
+ *                   during transformation. Can be used to add new override
+ *                   exisitng definitions.
+ * @param {function} [options.onSuccess] Callback after all stylesheets have
+ *                   been processed succesfully. Passes 1) a CSS string with CSS
+ *                   variable values resolved as an argument. Modifying the CSS
+ *                   appended when 'appendStyle' is 'true' can be done by
+ *                   returning a string value from this funtion (or 'false' to
+ *                   skip).
+ * @param {function} [options.onError] Callback on each error. Passes 1) an
+ *                   error message, and 2) source node reference as arguments.
+ * @param {function} [options.onWarning] Callback on each warning. Passes 1) a
+ *                   warning message as an argument.
+ * @param {function} [options.onComplete] Callback after all stylesheets have
+ *                   been processed succesfully and <style> node containing
+ *                   updated CSS has been appended to the DOM (based on
+ *                   'appendStyle' setting. Passes 1) a CSS string with CSS
+ *                   variable values resolved, and 2) a reference to the
+ *                   appended <style> node.
+ *
+ * @example
+ *
+ *   cssVars({
+ *     include    : 'style,link[rel="stylesheet"]', // default
+ *     exclude    : '',
+ *     appendStyle: true, // default
+ *     onlyLegacy : true, // default
+ *     onlyVars   : true, // default
+ *     preserve   : true, // default
+ *     silent     : false, // default
+ *     onError(message, node) {
+ *       // ...
+ *     },
+ *     onWarning(message) {
+ *       // ...
+ *     },
+ *     onSuccess(cssText) {
+ *       // ...
+ *     },
+ *     onComplete(cssText, styleNode) {
+ *       // ...
+ *     }
+ *   });
+ */    function cssVars() {
+        var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
+        var settings = mergeDeep(defaults, options);
+        function handleError(message, sourceNode) {
+            if (!settings.silent) {
+                console.error(message + "\n", sourceNode);
+            }
+            settings.onError(message, sourceNode);
+        }
+        function handleWarning(message) {
+            if (!settings.silent) {
+                console.warn(message);
+            }
+            settings.onWarning(message);
+        }
+        if (document.readyState !== "loading") {
+            var hasNativeSupport = window.CSS && window.CSS.supports && window.CSS.supports("(--a: 0)");
+            if (!hasNativeSupport || !settings.onlyLegacy) {
+                var styleNodeId = name;
+                getCssData({
+                    include: settings.include,
+                    exclude: "#" + styleNodeId + (settings.exclude ? "," + settings.exclude : ""),
+                    filter: settings.onlyVars ? reCssVars : null,
+                    onComplete: function onComplete(cssText, cssArray, nodeArray) {
+                        var styleNode = null;
+                        try {
+                            cssText = transformVars(cssText, {
+                                onlyVars: settings.onlyVars,
+                                preserve: settings.preserve,
+                                variables: settings.variables,
+                                onWarning: handleWarning
+                            });
+                            var returnVal = settings.onSuccess(cssText);
+                            cssText = returnVal === false ? "" : returnVal || cssText;
+                            if (settings.appendStyle) {
+                                styleNode = document.querySelector("#" + styleNodeId) || document.createElement("style");
+                                styleNode.setAttribute("id", styleNodeId);
+                                if (styleNode.textContent !== cssText) {
+                                    styleNode.textContent = cssText;
+                                }
+                                var styleTargetNode = document.querySelector("body link[rel=stylesheet], body style:not(#" + styleNodeId + ")") ? document.body : document.head;
+                                var isNewTarget = styleNode.parentNode !== styleTargetNode;
+                                var isLastStyleElm = matchesSelector$1(styleNode, "style:last-of-type");
+                                if (isNewTarget || !isLastStyleElm) {
+                                    styleTargetNode.appendChild(styleNode);
+                                }
+                            }
+                        } catch (err) {
+                            var errorThrown = false;
+                            cssArray.forEach(function(cssText, i) {
+                                try {
+                                    cssText = transformVars(cssText, settings);
+                                } catch (err) {
+                                    var errorNode = nodeArray[i - 0];
+                                    errorThrown = true;
+                                    handleError(err.message, errorNode);
+                                }
+                            });
+                            if (!errorThrown) {
+                                handleError(err.message || err);
+                            }
+                        }
+                        settings.onComplete(cssText, styleNode);
+                    },
+                    onError: function onError(xhr, node, url) {
+                        var errorMsg = "Unable to process " + url + " (" + xhr.status + " - " + xhr.statusText + "}";
+                        handleError(errorMsg, node);
+                    }
+                });
+            }
+        } else {
+            document.addEventListener("DOMContentLoaded", function init(evt) {
+                cssVars(options);
+                document.removeEventListener("DOMContentLoaded", init);
+            });
+        }
+    }
+    function matchesSelector$1(elm, selector) {
+        var matches = elm.matches || elm.matchesSelector || elm.webkitMatchesSelector || elm.mozMatchesSelector || elm.msMatchesSelector || elm.oMatchesSelector;
+        return matches.call(elm, selector);
+    }
+    return cssVars;
+});
+//# sourceMappingURL=css-vars-ponyfill.js.map
diff --git a/dist/css-vars-ponyfill.js.map b/dist/css-vars-ponyfill.js.map
new file mode 100644
index 0000000..14905de
--- /dev/null
+++ b/dist/css-vars-ponyfill.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"css-vars-ponyfill.js","sources":["../node_modules/get-css-data/dist/get-css-data.esm.js","../src/merge-deep.js","../node_modules/balanced-match/index.js","../src/parse-css.js","../src/stringify-css.js","../src/transform-css.js","../src/index.js"],"sourcesContent":["/*!\n * get-css-data\n * v1.1.1\n * https://github.com/jhildenbiddle/get-css-data\n * (c) 2018 John Hildenbiddle <http://hildenbiddle.com>\n * MIT license\n */\nfunction getUrls(urls) {\n    var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};\n    var settings = {\n        mimeType: options.mimeType || null,\n        onComplete: options.onComplete || Function.prototype,\n        onError: options.onError || Function.prototype,\n        onSuccess: options.onSuccess || Function.prototype\n    };\n    var urlArray = Array.isArray(urls) ? urls : [ urls ];\n    var urlQueue = Array.apply(null, Array(urlArray.length)).map(function(x) {\n        return null;\n    });\n    function onError(xhr, urlIndex) {\n        settings.onError(xhr, urlArray[urlIndex], urlIndex);\n    }\n    function onSuccess(responseText, urlIndex) {\n        urlQueue[urlIndex] = responseText;\n        settings.onSuccess(responseText, urlArray[urlIndex], urlIndex);\n        if (urlQueue.indexOf(null) === -1) {\n            settings.onComplete(urlQueue);\n        }\n    }\n    urlArray.forEach(function(url, i) {\n        var parser = document.createElement(\"a\");\n        parser.setAttribute(\"href\", url);\n        parser.href = parser.href;\n        var isCrossDomain = parser.host !== location.host;\n        var isSameProtocol = parser.protocol === location.protocol;\n        if (isCrossDomain && typeof XDomainRequest !== \"undefined\") {\n            if (isSameProtocol) {\n                var xdr = new XDomainRequest();\n                xdr.open(\"GET\", url);\n                xdr.timeout = 0;\n                xdr.onprogress = Function.prototype;\n                xdr.ontimeout = Function.prototype;\n                xdr.onload = function() {\n                    onSuccess(xdr.responseText, i);\n                };\n                xdr.onerror = function(err) {\n                    onError(xdr, i);\n                };\n                setTimeout(function() {\n                    xdr.send();\n                }, 0);\n            } else {\n                console.log(\"Internet Explorer 9 Cross-Origin (CORS) requests must use the same protocol\");\n                onError(null, i);\n            }\n        } else {\n            var xhr = new XMLHttpRequest();\n            xhr.open(\"GET\", url);\n            if (settings.mimeType && xhr.overrideMimeType) {\n                xhr.overrideMimeType(settings.mimeType);\n            }\n            xhr.onreadystatechange = function() {\n                if (xhr.readyState === 4) {\n                    if (xhr.status === 200) {\n                        onSuccess(xhr.responseText, i);\n                    } else {\n                        onError(xhr, i);\n                    }\n                }\n            };\n            xhr.send();\n        }\n    });\n}\n\n/**\n * Gets CSS data from <style> and <link> nodes (including @imports), then\n * returns data in order processed by DOM. Allows specifying nodes to\n * include/exclude and filtering CSS data using RegEx.\n *\n * @preserve\n * @param {object} [options={}] - The options object\n * @param {string} options.include - CSS selector matching <link> and <style>\n * nodes to include\n * @param {string} options.exclude - CSS selector matching <link> and <style>\n * nodes to exclude\n * @param {object} options.filter - Regular expression used to filter node CSS\n * data. Each block of CSS data is tested against the filter, and only matching\n * data is included.\n * @param {function} options.onComplete - Callback after all nodes have been\n * processed. Passes 1) concatenated CSS text, 2) an array of CSS text in DOM\n * order, and 3) an array of nodes in DOM order as arguments.\n * @param {function} options.onError - Callback on each error. Passes 1) the XHR\n * object for inspection, 2) soure node reference, and 3) the source URL that\n * failed (either a <link> href or an @import) as arguments\n * @param {function} options.onSuccess - Callback on each CSS node read. Passes\n * 1) CSS text, 2) source node reference, and 3) the source URL (either a <link>\n *    href or an import) as arguments.\n * @example\n *\n *   getCssData({\n *     include: 'style,link[rel=\"stylesheet\"]', // default\n *     exclude: '[href=\"skip.css\"]',\n *     filter : /red/,\n *     onComplete(cssText, cssArray) {\n *       // ...\n *     },\n *     onError(xhr, node, url) {\n *       // ...\n *     },\n *     onSuccess(cssText, node, url) {\n *       // ...\n *     }\n *   });\n */ function getCssData(options) {\n    var regex = {\n        cssComments: /\\/\\*[\\s\\S]+?\\*\\//g,\n        cssImports: /(?:@import\\s*)(?:url\\(\\s*)?(?:['\"])([^'\"]*)(?:['\"])(?:\\s*\\))?(?:[^;]*;)/g\n    };\n    var settings = {\n        include: options.include || 'style,link[rel=\"stylesheet\"]',\n        exclude: options.exclude || null,\n        filter: options.filter || null,\n        onComplete: options.onComplete || Function.prototype,\n        onError: options.onError || Function.prototype,\n        onSuccess: options.onSuccess || Function.prototype\n    };\n    var sourceNodes = Array.apply(null, document.querySelectorAll(settings.include)).filter(function(node) {\n        return !matchesSelector(node, settings.exclude);\n    });\n    var cssArray = Array.apply(null, Array(sourceNodes.length)).map(function(x) {\n        return null;\n    });\n    function handleComplete() {\n        var isComplete = cssArray.indexOf(null) === -1;\n        if (isComplete) {\n            var cssText = cssArray.join(\"\");\n            settings.onComplete(cssText, cssArray, sourceNodes);\n        }\n    }\n    function handleError(xhr, node, url, cssIndex) {\n        var cssText = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : \"\";\n        cssArray[cssIndex] = cssText;\n        settings.onError(xhr, node, url);\n        handleComplete();\n    }\n    function handleSuccess(cssText, cssIndex, node, sourceUrl, importUrl) {\n        if (!settings.filter || settings.filter.test(cssText)) {\n            var returnVal = settings.onSuccess(cssText, node, importUrl || sourceUrl);\n            cssText = returnVal === false ? \"\" : returnVal || cssText;\n            var importRules = cssText.replace(regex.cssComments, \"\").match(regex.cssImports);\n            if (importRules) {\n                var importUrls = importRules.map(function(decl) {\n                    return decl.replace(regex.cssImports, \"$1\");\n                });\n                importUrls = importUrls.map(function(url) {\n                    return getFullUrl(url, sourceUrl);\n                });\n                getUrls(importUrls, {\n                    onError: function onError(xhr, url, urlIndex) {\n                        handleError(xhr, node, url, cssIndex, cssText);\n                    },\n                    onSuccess: function onSuccess(importText, url, urlIndex) {\n                        var importDecl = importRules[urlIndex];\n                        var importUrl = importUrls[urlIndex];\n                        var newCssText = cssText.replace(importDecl, importText);\n                        handleSuccess(newCssText, cssIndex, node, url, importUrl);\n                    }\n                });\n            } else {\n                cssArray[cssIndex] = cssText;\n                handleComplete();\n            }\n        } else {\n            cssArray[cssIndex] = \"\";\n            handleComplete();\n        }\n    }\n    if (sourceNodes.length) {\n        sourceNodes.forEach(function(node, i) {\n            var linkHref = node.getAttribute(\"href\");\n            var linkRel = node.getAttribute(\"rel\");\n            var isLink = node.nodeName === \"LINK\" && linkHref && linkRel && linkRel.toLowerCase() === \"stylesheet\";\n            var isStyle = node.nodeName === \"STYLE\";\n            if (isLink) {\n                getUrls(linkHref, {\n                    mimeType: \"text/css\",\n                    onError: function onError(xhr, url, urlIndex) {\n                        handleError(xhr, node, url, i);\n                    },\n                    onSuccess: function onSuccess(cssText, url, urlIndex) {\n                        var sourceUrl = getFullUrl(linkHref, location.href);\n                        handleSuccess(cssText, i, node, sourceUrl);\n                    }\n                });\n            } else if (isStyle) {\n                handleSuccess(node.textContent, i, node, location.href);\n            } else {\n                cssArray[i] = \"\";\n                handleComplete();\n            }\n        });\n    } else {\n        settings.onComplete(\"\", []);\n    }\n}\n\nfunction getFullUrl(url) {\n    var base = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : location.href;\n    var d = document.implementation.createHTMLDocument(\"\");\n    var b = d.createElement(\"base\");\n    var a = d.createElement(\"a\");\n    d.head.appendChild(b);\n    d.body.appendChild(a);\n    b.href = base;\n    a.href = url;\n    return a.href;\n}\n\nfunction matchesSelector(elm, selector) {\n    var matches = elm.matches || elm.matchesSelector || elm.webkitMatchesSelector || elm.mozMatchesSelector || elm.msMatchesSelector || elm.oMatchesSelector;\n    return matches.call(elm, selector);\n}\n\nexport default getCssData;\n//# sourceMappingURL=get-css-data.esm.js.map\n","// Functions\n// =============================================================================\n/**\n * Performs a deep merge of objects and returns new object. Does not modify\n * objects (immutable) and merges arrays via concatenation.\n *\n * @param {...object} objects - Objects to merge\n * @returns {object} New object with merged key/values\n */\nfunction mergeDeep(...objects) {\n    const isObject = obj => obj instanceof Object && obj.constructor === Object;\n\n    return objects.reduce((prev, obj) => {\n        Object.keys(obj).forEach(key => {\n            const pVal = prev[key];\n            const oVal = obj[key];\n\n            // if (Array.isArray(pVal) && Array.isArray(oVal)) {\n            //     prev[key] = pVal.concat(...oVal);\n            // }\n            if (isObject(pVal) && isObject(oVal)) {\n                prev[key] = mergeDeep(pVal, oVal);\n            }\n            else {\n                prev[key] = oVal;\n            }\n        });\n\n        return prev;\n    }, {});\n}\n\n\n// Export\n// =============================================================================\nexport default mergeDeep;\n","'use strict';\nmodule.exports = balanced;\nfunction balanced(a, b, str) {\n  if (a instanceof RegExp) a = maybeMatch(a, str);\n  if (b instanceof RegExp) b = maybeMatch(b, str);\n\n  var r = range(a, b, str);\n\n  return r && {\n    start: r[0],\n    end: r[1],\n    pre: str.slice(0, r[0]),\n    body: str.slice(r[0] + a.length, r[1]),\n    post: str.slice(r[1] + b.length)\n  };\n}\n\nfunction maybeMatch(reg, str) {\n  var m = str.match(reg);\n  return m ? m[0] : null;\n}\n\nbalanced.range = range;\nfunction range(a, b, str) {\n  var begs, beg, left, right, result;\n  var ai = str.indexOf(a);\n  var bi = str.indexOf(b, ai + 1);\n  var i = ai;\n\n  if (ai >= 0 && bi > 0) {\n    begs = [];\n    left = str.length;\n\n    while (i >= 0 && !result) {\n      if (i == ai) {\n        begs.push(i);\n        ai = str.indexOf(a, i + 1);\n      } else if (begs.length == 1) {\n        result = [ begs.pop(), bi ];\n      } else {\n        beg = begs.pop();\n        if (beg < left) {\n          left = beg;\n          right = bi;\n        }\n\n        bi = str.indexOf(b, i + 1);\n      }\n\n      i = ai < bi && ai >= 0 ? ai : bi;\n    }\n\n    if (begs.length) {\n      result = [ left, right ];\n    }\n  }\n\n  return result;\n}\n","/**\n * Based on css parser/compiler by NxChg\n * https://github.com/NxtChg/pieces/tree/master/js/css_parser\n */\n\n\n// Functions\n// =============================================================================\n/**\n * Parses CSS string and generates AST object\n *\n * @param {string} css The CSS stringt to be converted to an AST\n * @returns {object}\n */\nfunction cssParse(css) {\n    const errors = [];\n\n    // Errors\n    // -------------------------------------------------------------------------\n    function error(msg) {\n        throw new Error(`CSS parse error: ${msg}`);\n    }\n\n    // RegEx\n    // -------------------------------------------------------------------------\n    // Match regexp and return captures\n    function match(re) {\n        const m = re.exec(css);\n\n        if (m) {\n            css = css.slice(m[0].length);\n\n            return m;\n        }\n    }\n\n    function whitespace() {\n        match(/^\\s*/);\n    }\n    function open() {\n        return match(/^{\\s*/);\n    }\n    function close() {\n        return match(/^}/);\n    }\n\n    // Comments\n    // -------------------------------------------------------------------------\n    function comment() {\n        whitespace();\n\n        if (css[0] !== '/' || css[1] !== '*') { return; }\n\n        let i = 2;\n        while (css[i] && (css[i] !== '*' || css[i + 1] !== '/')) { i++; }\n\n        // FIXED\n        if (!css[i]) { return error('end of comment is missing'); }\n\n        const str = css.slice(2, i);\n        css = css.slice(i + 2);\n\n        return { type: 'comment', comment: str };\n    }\n    function comments() {\n        const cmnts = [];\n\n        let c;\n\n        while ((c = comment())) {\n            cmnts.push(c);\n        }\n        return cmnts;\n    }\n\n    // Selector\n    // -------------------------------------------------------------------------\n    function selector() {\n        whitespace();\n        while (css[0] === '}') {\n            error('extra closing bracket');\n        }\n\n        const m = match(/^((\"(?:\\\\\"|[^\"])*\"|'(?:\\\\'|[^'])*'|[^{])+)/);\n\n        if (m)\n        { return m[0]\n            .trim() // remove all comments from selectors\n            .replace(/\\/\\*([^*]|[\\r\\n]|(\\*+([^*/]|[\\r\\n])))*\\*\\/+/g, '')\n            .replace(/\"(?:\\\\\"|[^\"])*\"|'(?:\\\\'|[^'])*'/g, function(m) {\n                return m.replace(/,/g, '\\u200C');\n            })\n            .split(/\\s*(?![^(]*\\)),\\s*/)\n            .map(function(s) {\n                return s.replace(/\\u200C/g, ',');\n            }); }\n    }\n\n    // Declarations\n    // -------------------------------------------------------------------------\n    function declaration() {\n        match(/^([;\\s]*)+/); // ignore empty declarations + whitespace\n\n        const comment_regexp = /\\/\\*[^*]*\\*+([^/*][^*]*\\*+)*\\//g;\n\n        let prop = match(/^(\\*?[-#/*\\\\\\w]+(\\[[0-9a-z_-]+\\])?)\\s*/);\n        if (!prop) { return; }\n\n        prop = prop[0].trim();\n\n        if (!match(/^:\\s*/)) { return error('property missing \\':\\''); }\n\n        // Quotes regex repeats verbatim inside and outside parentheses\n        const val = match(/^((?:\\/\\*.*?\\*\\/|'(?:\\\\'|.)*?'|\"(?:\\\\\"|.)*?\"|\\((\\s*'(?:\\\\'|.)*?'|\"(?:\\\\\"|.)*?\"|[^)]*?)\\s*\\)|[^};])+)/);\n\n        const ret = { type: 'declaration', property: prop.replace(comment_regexp, ''), value: val ? val[0].replace(comment_regexp, '').trim() : '' };\n\n        match(/^[;\\s]*/);\n\n        return ret;\n    }\n    function declarations() {\n        if (!open()) { return error('missing \\'{\\''); }\n\n        let d,\n            decls = comments();\n\n        while ((d = declaration())) {\n            decls.push(d);\n            decls = decls.concat(comments());\n        }\n\n        if (!close()) { return error('missing \\'}\\''); }\n\n        return decls;\n    }\n\n    // Keyframes\n    // -------------------------------------------------------------------------\n    function keyframe() {\n        whitespace();\n\n        const vals = [];\n\n        let m;\n\n        while ((m = match(/^((\\d+\\.\\d+|\\.\\d+|\\d+)%?|[a-z]+)\\s*/))) {\n            vals.push(m[1]);\n            match(/^,\\s*/);\n        }\n\n        if (vals.length) { return { type: 'keyframe', values: vals, declarations: declarations() }; }\n    }\n    function at_keyframes() {\n        let m = match(/^@([-\\w]+)?keyframes\\s*/);\n\n        if (!m) { return; }\n\n        const vendor = m[1];\n\n        m = match(/^([-\\w]+)\\s*/);\n        if (!m) { return error('@keyframes missing name'); } // identifier\n\n        const name = m[1];\n\n        if (!open()) { return error('@keyframes missing \\'{\\''); }\n\n        let frame,\n            frames = comments();\n        while ((frame = keyframe())) {\n            frames.push(frame);\n            frames = frames.concat(comments());\n        }\n\n        if (!close()) { return error('@keyframes missing \\'}\\''); }\n\n        return { type: 'keyframes', name: name, vendor: vendor, keyframes: frames };\n    }\n\n    // @ Rules\n    // -------------------------------------------------------------------------\n    function at_page() {\n        const m = match(/^@page */);\n        if (m) {\n            const sel = selector() || [];\n            return { type: 'page', selectors: sel, declarations: declarations() };\n        }\n    }\n    function at_fontface() {\n        const m = match(/^@font-face\\s*/);\n        if (m) { return { type: 'font-face', declarations: declarations() }; }\n    }\n    function at_supports() {\n        const m = match(/^@supports *([^{]+)/);\n        if (m) { return { type: 'supports', supports: m[1].trim(), rules: rules() }; }\n    }\n    function at_host() {\n        const m = match(/^@host\\s*/);\n        if (m) { return { type: 'host', rules: rules() }; }\n    }\n    function at_media() {\n        const m = match(/^@media *([^{]+)/);\n        if (m) { return { type: 'media', media: m[1].trim(), rules: rules() }; }\n    }\n    function at_custom_m() {\n        const m = match(/^@custom-media\\s+(--[^\\s]+)\\s*([^{;]+);/);\n        if (m) { return { type: 'custom-media', name: m[1].trim(), media: m[2].trim() }; }\n    }\n    function at_document() {\n        const m = match(/^@([-\\w]+)?document *([^{]+)/);\n        // FIXED\n        if (m) { return { type: 'document', document: m[2].trim(), vendor: m[1] ? m[1].trim() : null, rules: rules() }; }\n    }\n    function at_x() {\n        const m = match(/^@(import|charset|namespace)\\s*([^;]+);/);\n        if (m) { return { type: m[1], name: m[2].trim() }; }\n    }\n    function at_rule() {\n        whitespace();\n        if (css[0] === '@') { return at_keyframes() || at_supports() || at_host() || at_media() || at_custom_m() || at_page() || at_document() || at_fontface() || at_x(); }\n    }\n\n    // Rules\n    // -------------------------------------------------------------------------\n    function rule() {\n        const sel = selector() || [];\n        if (!sel.length) { error('selector missing'); }\n\n        const decls = declarations();\n\n        return { type: 'rule', selectors: sel, declarations: decls };\n    }\n    function rules(core) {\n        if (!core && !open()) { return error('missing \\'{\\''); }\n\n        let node,\n            rules = comments();\n\n        while (css.length && (core || css[0] !== '}') && (node = at_rule() || rule())) {\n            rules.push(node);\n            rules = rules.concat(comments());\n        }\n\n        if (!core && !close()) { return error('missing \\'}\\''); }\n\n        return rules;\n    }\n\n    return { type: 'stylesheet', stylesheet: { rules: rules(true), errors: errors } };\n}\n\n\n// Exports\n// =============================================================================\nexport default cssParse;\n","/**\n * Based on css parser/compiler by NxChg\n * https://github.com/NxtChg/pieces/tree/master/js/css_parser\n */\n\n\n// Functions\n// =============================================================================\n/**\n * Compiles CSS AST to string\n *\n * @param {object}   tree CSS AST object\n * @param {string}   [delim=''] CSS rule delimiter\n * @param {function} cb Function to be called before each node is processed\n * @returns {string}\n */\nfunction stringifyCss(tree, delim = '', cb) {\n    const renderMethods = {\n        charset(node) {\n            return '@charset ' + node.name + ';';\n        },\n        comment(node) {\n            return '';\n        },\n        'custom-media'(node) {\n            return '@custom-media ' + node.name + ' ' + node.media + ';';\n        },\n        declaration(node) {\n            return node.property + ':' + node.value + ';';\n        },\n        document(node) {\n            return '@' + (node.vendor || '') + 'document ' + node.document + '{' + visit(node.rules) + '}';\n        },\n        'font-face'(node) {\n            return '@font-face' + '{' + visit(node.declarations) + '}';\n        },\n        host(node) {\n            return '@host' + '{' + visit(node.rules) + '}';\n        },\n        import(node) {\n            // FIXED\n            return '@import ' + node.name + ';';\n        },\n        keyframe(node) {\n            return node.values.join(',') + '{' + visit(node.declarations) + '}';\n        },\n        keyframes(node) {\n            return '@' + (node.vendor || '') + 'keyframes ' + node.name + '{' + visit(node.keyframes) + '}';\n        },\n        media(node) {\n            return '@media ' + node.media + '{' + visit(node.rules) + '}';\n        },\n        namespace(node) {\n            return '@namespace ' + node.name + ';';\n        },\n        page(node) {\n            return '@page ' + (node.selectors.length ? node.selectors.join(', ') : '') + '{' + visit(node.declarations) + '}';\n        },\n        rule(node) {\n            const decls = node.declarations;\n\n            if (decls.length) {\n                return node.selectors.join(',') + '{' + visit(decls) + '}';\n            }\n        },\n        supports(node) {\n            // FIXED\n            return '@supports ' + node.supports + '{' + visit(node.rules) + '}';\n        }\n    };\n\n    function visit(nodes) {\n        let buf = '';\n\n        for (let i = 0; i < nodes.length; i++) {\n            const n = nodes[i];\n\n            if (cb) {\n                cb(n);\n            }\n\n            const txt = renderMethods[n.type](n);\n\n            if (txt) {\n                buf += txt;\n\n                if (txt.length && n.selectors) {\n                    buf += delim;\n                }\n            }\n        }\n\n        return buf;\n    }\n\n    return visit(tree.stylesheet.rules);\n}\n\n\n// Exports\n// =============================================================================\nexport default stringifyCss;\n","/**\n * Based on rework-vars by reworkcss\n * https://github.com/reworkcss/rework-vars\n */\n\n\n// Dependencies\n// =============================================================================\nimport balanced     from 'balanced-match';\nimport mergeDeep    from './merge-deep';\nimport parseCss     from './parse-css';\nimport stringifyCss from './stringify-css';\n\n\n// Constants & Variables\n// =============================================================================\nconst VAR_PROP_IDENTIFIER = '--';\nconst VAR_FUNC_IDENTIFIER = 'var';\nconst reVarProp = /^--/;\nconst reVarVal  = /^var(.*)/;\n\n\n// Functions\n// =============================================================================\n/**\n * Transforms W3C-style CSS variables to static values and returns an updated\n * CSS string.\n *\n * @param {object}   cssText CSS containing variable definitions and functions\n * @param {object}   [options] Options object\n * @param {boolean}  [options.onlyVars=true] Remove declarations that do not\n *                   contain a CSS variable from the return value. Note that\n *                   @font-face and @keyframe rules require all declarations to\n *                   be returned if a CSS variable is used.\n * @param {boolean}  [options.preserve=true] Preserve CSS variable definitions\n *                   and functions in the return value, allowing \"live\" variable\n *                   updates via JavaScript to continue working in browsers with\n *                   native CSS variable support.\n * @param {object}   [options.variables={}] CSS variable definitions to include\n *                   during transformation. Can be used to add new override\n *                   exisitng definitions.\n * @param {function} [options.onWarning] Callback on each transformation\n *                   warning. Passes 1) warningMessage as an argument.\n * @returns {string}\n */\nfunction transformVars(cssText, options = {}) {\n    const defaults = {\n        onlyVars : true,\n        preserve : true,\n        variables: {},\n        onWarning() {}\n    };\n    const map      = {};\n    const settings = mergeDeep(defaults, options);\n\n    // Convert cssText to AST (this could throw errors)\n    const cssTree = parseCss(cssText);\n\n    // Remove non-vars\n    if (settings.onlyVars) {\n        cssTree.stylesheet.rules = filterVars(cssTree.stylesheet.rules);\n    }\n\n    // Define variables\n    cssTree.stylesheet.rules.forEach(function(rule) {\n        const varNameIndices = [];\n\n        if (rule.type !== 'rule') {\n            return;\n        }\n\n        // only variables declared for `:root` are supported\n        if (rule.selectors.length !== 1 || rule.selectors[0] !== ':root') {\n            return;\n        }\n\n        rule.declarations.forEach(function(decl, i) {\n            const prop = decl.property;\n            const value = decl.value;\n\n            if (prop && prop.indexOf(VAR_PROP_IDENTIFIER) === 0) {\n                map[prop] = value;\n                varNameIndices.push(i);\n            }\n        });\n\n        // optionally remove `--*` properties from the rule\n        if (!settings.preserve) {\n            for (let i = varNameIndices.length - 1; i >= 0; i--) {\n                rule.declarations.splice(varNameIndices[i], 1);\n            }\n        }\n    });\n\n    // Handle variables defined in settings.variables\n    if (Object.keys(settings.variables).length) {\n        const newRule = {\n            declarations: [],\n            selectors   : [':root'],\n            type        : 'rule'\n        };\n\n        Object.keys(settings.variables).forEach(function(key) {\n            // Normalize variables by ensuring all start with leading '--'\n            const varName  = `--${key.replace(/^-+/, '')}`;\n            const varValue = settings.variables[key];\n\n            // Update internal map value with settings.variables value\n            map[varName] = varValue;\n\n            // Add new declaration to newRule\n            newRule.declarations.push({\n                type    : 'declaration',\n                property: varName,\n                value   : varValue\n            });\n        });\n\n        // Append new :root ruleset\n        if (settings.preserve) {\n            cssTree.stylesheet.rules.push(newRule);\n        }\n    }\n\n    // Resolve variables\n    walkCss(cssTree.stylesheet, function(declarations, node) {\n        let decl;\n        let resolvedValue;\n        let value;\n\n        for (let i = 0; i < declarations.length; i++) {\n            decl = declarations[i];\n            value = decl.value;\n\n            // skip comments\n            if (decl.type !== 'declaration') {\n                continue;\n            }\n\n            // skip values that don't contain variable functions\n            if (!value || value.indexOf(VAR_FUNC_IDENTIFIER + '(') === -1) {\n                continue;\n            }\n\n            resolvedValue = resolveValue(value, map, settings);\n\n            if (resolvedValue !== 'undefined') {\n                if (!settings.preserve) {\n                    decl.value = resolvedValue;\n                }\n                else {\n                    declarations.splice(i, 0, {\n                        type    : decl.type,\n                        property: decl.property,\n                        value   : resolvedValue\n                    });\n\n                    // skip ahead of preserved declaration\n                    i++;\n                }\n            }\n        }\n    });\n\n    // Return CSS string\n    return stringifyCss(cssTree);\n}\n\n\n// Functions (Private)\n// =============================================================================\n/**\n * Filters rules recursively, retaining only declarations that contain either a\n * CSS variable definition (property) or function (value). Maintains all\n * declarations for @font-face and @keyframes rules that contain a CSS\n * definition or function.\n *\n * @param {array} rules\n * @returns {array}\n */\nfunction filterVars(rules) {\n    return rules.filter(rule => {\n        // Rule, @font-face, @host, @page\n        if (rule.declarations) {\n            // @font-face rules require all declarations to be retained if any\n            // declaration contains a CSS variable definition or value.\n            // For other rules, any declaration that does not contain a CSS\n            // variable can be removed.\n            let declArray = rule.type === 'font-face' ? [] : rule.declarations;\n\n            declArray = rule.declarations.filter(d => reVarProp.test(d.property) || reVarVal.test(d.value));\n\n            return Boolean(declArray.length);\n        }\n        // @keyframes\n        else if (rule.keyframes) {\n            // @keyframe rules require all declarations to be retained if any\n            // declaration contains a CSS variable definition or value.\n            return Boolean(rule.keyframes.filter(k =>\n                Boolean(k.declarations.filter(d => reVarProp.test(d.property) || reVarVal.test(d.value)).length)\n            ).length);\n        }\n        // @document, @media, @supports\n        else if (rule.rules) {\n            rule.rules = filterVars(rule.rules).filter(r => r.declarations.length);\n\n            return Boolean(rule.rules.length);\n        }\n\n        return true;\n    });\n}\n\n/**\n * Resolve CSS variables in a value\n *\n * The second argument to a CSS variable function, if provided, is a fallback\n * value, which is used as the substitution value when the referenced variable\n * is invalid.\n *\n * var(name[, fallback])\n *\n * @param {string} value A property value containing a CSS variable function\n * @param {object} map A map of variable names and values\n * @param {object} settings Settings object passed from transformVars()\n * @return {string} A new value with CSS variables substituted or using fallback\n */\nfunction resolveValue(value, map, settings) {\n    // matches `name[, fallback]`, captures 'name' and 'fallback'\n    const RE_VAR = /([\\w-]+)(?:\\s*,\\s*)?(.*)?/;\n    const balancedParens = balanced('(', ')', value);\n    const varStartIndex  = value.indexOf('var(');\n    const varRef         = balanced('(', ')', value.substring(varStartIndex)).body;\n    const warningIntro   = 'CSS transform warning:';\n\n    /* istanbul ignore next */\n    if (!balancedParens) {\n        settings.onWarning(`${warningIntro} missing closing \")\" in the value \"${value}\"`);\n    }\n\n    /* istanbul ignore next */\n    if (varRef === '') {\n        settings.onWarning(`${warningIntro} var() must contain a non-whitespace string`);\n    }\n\n    const varFunc = VAR_FUNC_IDENTIFIER + '(' + varRef + ')';\n\n    const varResult = varRef.replace(RE_VAR, function(_, name, fallback) {\n        const replacement = map[name];\n\n        if (!replacement && !fallback) {\n            settings.onWarning(`${warningIntro} variable \"${name}\" is undefined`);\n        }\n\n        if (!replacement && fallback) {\n            return fallback;\n        }\n\n        return replacement;\n    });\n\n    // resolve the variable\n    value = value.split(varFunc).join(varResult);\n\n    // recursively resolve any remaining variables in the value\n    if (value.indexOf(VAR_FUNC_IDENTIFIER) !== -1) {\n        value = resolveValue(value, map, settings);\n    }\n\n    return value;\n}\n\n/**\n * Visit `node` declarations recursively and invoke `fn(declarations, node)`.\n *\n * Based on rework-visit by reworkcss\n * https://github.com/reworkcss/rework-visit\n *\n * @param {object} node\n * @param {function} fn\n */\nfunction walkCss(node, fn){\n    node.rules.forEach(function(rule){\n        // @media etc\n        if (rule.rules) {\n            walkCss(rule, fn);\n\n            return;\n        }\n\n        // keyframes\n        if (rule.keyframes) {\n            rule.keyframes.forEach(function(keyframe){\n                if (keyframe.type === 'keyframe') {\n                    fn(keyframe.declarations, rule);\n                }\n            });\n\n            return;\n        }\n\n        // @charset, @import etc\n        if (!rule.declarations) {\n            return;\n        }\n\n        fn(rule.declarations, node);\n    });\n}\n\n\n// Exports\n// =============================================================================\nexport default transformVars;\n","// Dependencies\n// =============================================================================\nimport getCssData          from 'get-css-data';\nimport mergeDeep           from './merge-deep';\nimport transformCss        from './transform-css';\nimport { name as pkgName } from '../package.json';\n\n\n// Constants & Variables\n// =============================================================================\nconst defaults = {\n    // Sources\n    include    : 'style,link[rel=stylesheet]',\n    exclude    : '',\n    // Options\n    appendStyle: true,  // cssVars\n    onlyLegacy : true,  // cssVars\n    onlyVars   : true,  // cssVars, transformCss\n    preserve   : true,  // transformCss\n    silent     : false, // cssVars\n    variables  : {},    // transformCss\n    // Callbacks\n    onSuccess() {},     // cssVars\n    onError() {},       // cssVars\n    onWarning() {},     // transformCss\n    onComplete() {}     // cssVars\n};\n// Regex: CSS variable :root declarations and var() function values\nconst reCssVars = /(?:(?::root\\s*{\\s*[^;]*;*\\s*)|(?:var\\(\\s*))(--[^:)]+)(?:\\s*[:)])/;\n\n\n\n\n// Functions\n// =============================================================================\n/**\n * Description\n *\n * @preserve\n * @param {object}   [options] Options object\n * @param {string}   [options.include=\"style,link[rel=stylesheet]\"] CSS selector\n *                   matching <link> and <style> nodes to include\n * @param {string}   [options.exclude=\"\"] CSS selector matching <link> and\n *                   <style> nodes to exclude\n * @param {boolean}  [options.appendStyle=true] Append <style> node containing\n *                   updated CSS to DOM\n * @param {boolean}  [options.onlyLegacy=true] Only process CSS variables in\n *                   browsers that lack native support\n * @param {boolean}  [options.onlyVars=true] Remove declarations that do not\n *                   contain a CSS variable from the return value. Note that\n *                   font-face and keyframe rules require all declarations to be\n *                   returned if a CSS variable is used.\n * @param {boolean}  [options.preserve=true] Preserve CSS variable definitions\n *                   and functions in the return value, allowing \"live\" variable\n *                   updates via JavaScript to continue working in browsers with\n *                   native CSS variable support.\n * @param {boolean}  [options.silent=false] Prevent console warnign and error\n *                   messages\n * @param {object}   [options.variables={}] CSS variable definitions to include\n *                   during transformation. Can be used to add new override\n *                   exisitng definitions.\n * @param {function} [options.onSuccess] Callback after all stylesheets have\n *                   been processed succesfully. Passes 1) a CSS string with CSS\n *                   variable values resolved as an argument. Modifying the CSS\n *                   appended when 'appendStyle' is 'true' can be done by\n *                   returning a string value from this funtion (or 'false' to\n *                   skip).\n * @param {function} [options.onError] Callback on each error. Passes 1) an\n *                   error message, and 2) source node reference as arguments.\n * @param {function} [options.onWarning] Callback on each warning. Passes 1) a\n *                   warning message as an argument.\n * @param {function} [options.onComplete] Callback after all stylesheets have\n *                   been processed succesfully and <style> node containing\n *                   updated CSS has been appended to the DOM (based on\n *                   'appendStyle' setting. Passes 1) a CSS string with CSS\n *                   variable values resolved, and 2) a reference to the\n *                   appended <style> node.\n *\n * @example\n *\n *   cssVars({\n *     include    : 'style,link[rel=\"stylesheet\"]', // default\n *     exclude    : '',\n *     appendStyle: true, // default\n *     onlyLegacy : true, // default\n *     onlyVars   : true, // default\n *     preserve   : true, // default\n *     silent     : false, // default\n *     onError(message, node) {\n *       // ...\n *     },\n *     onWarning(message) {\n *       // ...\n *     },\n *     onSuccess(cssText) {\n *       // ...\n *     },\n *     onComplete(cssText, styleNode) {\n *       // ...\n *     }\n *   });\n */\nfunction cssVars(options = {}) {\n    const settings = mergeDeep(defaults, options);\n\n    function handleError(message, sourceNode) {\n        /* istanbul ignore next */\n        if (!settings.silent) {\n            // eslint-disable-next-line\n            console.error(`${message}\\n`, sourceNode);\n        }\n\n        settings.onError(message, sourceNode);\n    }\n\n    function handleWarning(message) {\n        /* istanbul ignore next */\n        if (!settings.silent) {\n            // eslint-disable-next-line\n            console.warn(message);\n        }\n\n        settings.onWarning(message);\n    }\n\n    // Verify readyState to ensure all <link> and <style> nodes are available\n    if (document.readyState !== 'loading') {\n        const hasNativeSupport = window.CSS && window.CSS.supports && window.CSS.supports('(--a: 0)');\n\n        // Lacks native support or onlyLegacy 'false'\n        if (!hasNativeSupport || !settings.onlyLegacy) {\n            const styleNodeId = pkgName;\n\n            getCssData({\n                include: settings.include,\n                // Always exclude styleNodeId element, which is the generated\n                // <style> node containing previously transformed CSS.\n                exclude: `#${styleNodeId}` + (settings.exclude ? `,${settings.exclude}` : ''),\n                // This filter does a test on each block of CSS. An additional\n                // filter is used in the parser to remove individual\n                // declarations.\n                filter : settings.onlyVars ? reCssVars : null,\n                onComplete(cssText, cssArray, nodeArray) {\n                    let styleNode = null;\n\n                    try {\n                        cssText = transformCss(cssText, {\n                            onlyVars : settings.onlyVars,\n                            preserve : settings.preserve,\n                            variables: settings.variables,\n                            onWarning: handleWarning\n                        });\n\n                        // Success if an error was not been throw during\n                        // transformation. Store the onSuccess return value,\n                        // which allows modifying cssText before passing to\n                        // onComplete and/or appending to new <style> node.\n                        const returnVal = settings.onSuccess(cssText);\n\n                        // Set cssText to return value (if provided)\n                        cssText = returnVal === false ? 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diff --git a/dist/css-vars-ponyfill.min.js b/dist/css-vars-ponyfill.min.js
new file mode 100644
index 0000000..4cecb42
--- /dev/null
+++ b/dist/css-vars-ponyfill.min.js
@@ -0,0 +1,16 @@
+/*!
+ * css-vars-ponyfill
+ * v0.0.1
+ * https://github.com/jhildenbiddle/css-vars-ponyfill
+ * (c) 2018 John Hildenbiddle <http://hildenbiddle.com>
+ * MIT license
+ */
+!function(e,n){"object"==typeof exports&&"undefined"!=typeof module?module.exports=n():"function"==typeof define&&define.amd?define(n):e.cssVars=n()}(this,function(){"use strict";
+/*!
+ * get-css-data
+ * v1.1.1
+ * https://github.com/jhildenbiddle/get-css-data
+ * (c) 2018 John Hildenbiddle <http://hildenbiddle.com>
+ * MIT license
+ */function e(e){var n=arguments.length>1&&void 0!==arguments[1]?arguments[1]:{},t={mimeType:n.mimeType||null,onComplete:n.onComplete||Function.prototype,onError:n.onError||Function.prototype,onSuccess:n.onSuccess||Function.prototype},r=Array.isArray(e)?e:[e],o=Array.apply(null,Array(r.length)).map(function(e){return null});function s(e,n){t.onError(e,r[n],n)}function i(e,n){o[n]=e,t.onSuccess(e,r[n],n),-1===o.indexOf(null)&&t.onComplete(o)}r.forEach(function(e,n){var r=document.createElement("a");r.setAttribute("href",e),r.href=r.href;var o=r.host!==location.host,a=r.protocol===location.protocol;if(o&&"undefined"!=typeof XDomainRequest)if(a){var c=new XDomainRequest;c.open("GET",e),c.timeout=0,c.onprogress=Function.prototype,c.ontimeout=Function.prototype,c.onload=function(){i(c.responseText,n)},c.onerror=function(e){s(c,n)},setTimeout(function(){c.send()},0)}else console.log("Internet Explorer 9 Cross-Origin (CORS) requests must use the same protocol"),s(null,n);else{var u=new 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index 0000000..d0f7671
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Allows specifying nodes to\n * include/exclude and filtering CSS data using RegEx.\n *\n * @preserve\n * @param {object} [options={}] - The options object\n * @param {string} options.include - CSS selector matching <link> and <style>\n * nodes to include\n * @param {string} options.exclude - CSS selector matching <link> and <style>\n * nodes to exclude\n * @param {object} options.filter - Regular expression used to filter node CSS\n * data. Each block of CSS data is tested against the filter, and only matching\n * data is included.\n * @param {function} options.onComplete - Callback after all nodes have been\n * processed. Passes 1) concatenated CSS text, 2) an array of CSS text in DOM\n * order, and 3) an array of nodes in DOM order as arguments.\n * @param {function} options.onError - Callback on each error. 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Passes\n * 1) CSS text, 2) source node reference, and 3) the source URL (either a <link>\n *    href or an import) as arguments.\n * @example\n *\n *   getCssData({\n *     include: 'style,link[rel=\"stylesheet\"]', // default\n *     exclude: '[href=\"skip.css\"]',\n *     filter : /red/,\n *     onComplete(cssText, cssArray) {\n *       // ...\n *     },\n *     onError(xhr, node, url) {\n *       // ...\n *     },\n *     onSuccess(cssText, node, url) {\n *       // ...\n *     }\n *   });\n */ function getCssData(options) {\n    var regex = {\n        cssComments: /\\/\\*[\\s\\S]+?\\*\\//g,\n        cssImports: /(?:@import\\s*)(?:url\\(\\s*)?(?:['\"])([^'\"]*)(?:['\"])(?:\\s*\\))?(?:[^;]*;)/g\n    };\n    var settings = {\n        include: options.include || 'style,link[rel=\"stylesheet\"]',\n        exclude: options.exclude || null,\n        filter: options.filter || null,\n        onComplete: options.onComplete || Function.prototype,\n        onError: options.onError || Function.prototype,\n        onSuccess: options.onSuccess || Function.prototype\n    };\n    var sourceNodes = Array.apply(null, document.querySelectorAll(settings.include)).filter(function(node) {\n        return !matchesSelector(node, settings.exclude);\n    });\n    var cssArray = Array.apply(null, Array(sourceNodes.length)).map(function(x) {\n        return null;\n    });\n    function handleComplete() {\n        var isComplete = cssArray.indexOf(null) === -1;\n        if (isComplete) {\n            var cssText = cssArray.join(\"\");\n            settings.onComplete(cssText, cssArray, sourceNodes);\n        }\n    }\n    function handleError(xhr, node, url, cssIndex) {\n        var cssText = arguments.length > 4 && arguments[4] !== undefined ? 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arguments[1] : location.href;\n    var d = document.implementation.createHTMLDocument(\"\");\n    var b = d.createElement(\"base\");\n    var a = d.createElement(\"a\");\n    d.head.appendChild(b);\n    d.body.appendChild(a);\n    b.href = base;\n    a.href = url;\n    return a.href;\n}\n\nfunction matchesSelector(elm, selector) {\n    var matches = elm.matches || elm.matchesSelector || elm.webkitMatchesSelector || elm.mozMatchesSelector || elm.msMatchesSelector || elm.oMatchesSelector;\n    return matches.call(elm, selector);\n}\n\nexport default getCssData;\n//# sourceMappingURL=get-css-data.esm.js.map\n","// Functions\n// =============================================================================\n/**\n * Performs a deep merge of objects and returns new object. Does not modify\n * objects (immutable) and merges arrays via concatenation.\n *\n * @param {...object} objects - Objects to merge\n * @returns {object} New object with merged key/values\n */\nfunction mergeDeep(...objects) {\n    const isObject = obj => obj instanceof Object && obj.constructor === Object;\n\n    return objects.reduce((prev, obj) => {\n        Object.keys(obj).forEach(key => {\n            const pVal = prev[key];\n            const oVal = obj[key];\n\n            // if (Array.isArray(pVal) && Array.isArray(oVal)) {\n            //     prev[key] = pVal.concat(...oVal);\n            // }\n            if (isObject(pVal) && isObject(oVal)) {\n                prev[key] = mergeDeep(pVal, oVal);\n            }\n            else {\n                prev[key] = oVal;\n            }\n        });\n\n        return prev;\n    }, {});\n}\n\n\n// Export\n// =============================================================================\nexport default mergeDeep;\n","'use strict';\nmodule.exports = balanced;\nfunction balanced(a, b, str) {\n  if (a instanceof RegExp) a = maybeMatch(a, str);\n  if (b instanceof RegExp) b = maybeMatch(b, str);\n\n  var r = range(a, b, str);\n\n  return r && {\n    start: r[0],\n    end: r[1],\n    pre: str.slice(0, r[0]),\n    body: str.slice(r[0] + a.length, r[1]),\n    post: str.slice(r[1] + b.length)\n  };\n}\n\nfunction maybeMatch(reg, str) {\n  var m = str.match(reg);\n  return m ? m[0] : null;\n}\n\nbalanced.range = range;\nfunction range(a, b, str) {\n  var begs, beg, left, right, result;\n  var ai = str.indexOf(a);\n  var bi = str.indexOf(b, ai + 1);\n  var i = ai;\n\n  if (ai >= 0 && bi > 0) {\n    begs = [];\n    left = str.length;\n\n    while (i >= 0 && !result) {\n      if (i == ai) {\n        begs.push(i);\n        ai = str.indexOf(a, i + 1);\n      } else if (begs.length == 1) {\n        result = [ begs.pop(), bi ];\n      } else {\n        beg = begs.pop();\n        if (beg < left) {\n          left = beg;\n          right = bi;\n        }\n\n        bi = str.indexOf(b, i + 1);\n      }\n\n      i = ai < bi && ai >= 0 ? ai : bi;\n    }\n\n    if (begs.length) {\n      result = [ left, right ];\n    }\n  }\n\n  return result;\n}\n","/**\n * Based on css parser/compiler by NxChg\n * https://github.com/NxtChg/pieces/tree/master/js/css_parser\n */\n\n\n// Functions\n// =============================================================================\n/**\n * Parses CSS string and generates AST object\n *\n * @param {string} css The CSS stringt to be converted to an AST\n * @returns {object}\n */\nfunction cssParse(css) {\n    const errors = [];\n\n    // Errors\n    // -------------------------------------------------------------------------\n    function error(msg) {\n        throw new Error(`CSS parse error: ${msg}`);\n    }\n\n    // RegEx\n    // -------------------------------------------------------------------------\n    // Match regexp and return captures\n    function match(re) {\n        const m = re.exec(css);\n\n        if (m) {\n            css = css.slice(m[0].length);\n\n            return m;\n        }\n    }\n\n    function whitespace() {\n        match(/^\\s*/);\n    }\n    function open() {\n        return match(/^{\\s*/);\n    }\n    function close() {\n        return match(/^}/);\n    }\n\n    // Comments\n    // -------------------------------------------------------------------------\n    function comment() {\n        whitespace();\n\n        if (css[0] !== '/' || css[1] !== '*') { return; }\n\n        let i = 2;\n        while (css[i] && (css[i] !== '*' || css[i + 1] !== '/')) { i++; }\n\n        // FIXED\n        if (!css[i]) { return error('end of comment is missing'); }\n\n        const str = css.slice(2, i);\n        css = css.slice(i + 2);\n\n        return { type: 'comment', comment: str };\n    }\n    function comments() {\n        const cmnts = [];\n\n        let c;\n\n        while ((c = comment())) {\n            cmnts.push(c);\n        }\n        return cmnts;\n    }\n\n    // Selector\n    // -------------------------------------------------------------------------\n    function selector() {\n        whitespace();\n        while (css[0] === '}') {\n            error('extra closing bracket');\n        }\n\n        const m = match(/^((\"(?:\\\\\"|[^\"])*\"|'(?:\\\\'|[^'])*'|[^{])+)/);\n\n        if (m)\n        { return m[0]\n            .trim() // remove all comments from selectors\n            .replace(/\\/\\*([^*]|[\\r\\n]|(\\*+([^*/]|[\\r\\n])))*\\*\\/+/g, '')\n            .replace(/\"(?:\\\\\"|[^\"])*\"|'(?:\\\\'|[^'])*'/g, function(m) {\n                return m.replace(/,/g, '\\u200C');\n            })\n            .split(/\\s*(?![^(]*\\)),\\s*/)\n            .map(function(s) {\n                return s.replace(/\\u200C/g, ',');\n            }); }\n    }\n\n    // Declarations\n    // -------------------------------------------------------------------------\n    function declaration() {\n        match(/^([;\\s]*)+/); // ignore empty declarations + whitespace\n\n        const comment_regexp = /\\/\\*[^*]*\\*+([^/*][^*]*\\*+)*\\//g;\n\n        let prop = match(/^(\\*?[-#/*\\\\\\w]+(\\[[0-9a-z_-]+\\])?)\\s*/);\n        if (!prop) { return; }\n\n        prop = prop[0].trim();\n\n        if (!match(/^:\\s*/)) { return error('property missing \\':\\''); }\n\n        // Quotes regex repeats verbatim inside and outside parentheses\n        const val = match(/^((?:\\/\\*.*?\\*\\/|'(?:\\\\'|.)*?'|\"(?:\\\\\"|.)*?\"|\\((\\s*'(?:\\\\'|.)*?'|\"(?:\\\\\"|.)*?\"|[^)]*?)\\s*\\)|[^};])+)/);\n\n        const ret = { type: 'declaration', property: prop.replace(comment_regexp, ''), value: val ? val[0].replace(comment_regexp, '').trim() : '' };\n\n        match(/^[;\\s]*/);\n\n        return ret;\n    }\n    function declarations() {\n        if (!open()) { return error('missing \\'{\\''); }\n\n        let d,\n            decls = comments();\n\n        while ((d = declaration())) {\n            decls.push(d);\n            decls = decls.concat(comments());\n        }\n\n        if (!close()) { return error('missing \\'}\\''); }\n\n        return decls;\n    }\n\n    // Keyframes\n    // -------------------------------------------------------------------------\n    function keyframe() {\n        whitespace();\n\n        const vals = [];\n\n        let m;\n\n        while ((m = match(/^((\\d+\\.\\d+|\\.\\d+|\\d+)%?|[a-z]+)\\s*/))) {\n            vals.push(m[1]);\n            match(/^,\\s*/);\n        }\n\n        if (vals.length) { return { type: 'keyframe', values: vals, declarations: declarations() }; }\n    }\n    function at_keyframes() {\n        let m = match(/^@([-\\w]+)?keyframes\\s*/);\n\n        if (!m) { return; }\n\n        const vendor = m[1];\n\n        m = match(/^([-\\w]+)\\s*/);\n        if (!m) { return error('@keyframes missing name'); } // identifier\n\n        const name = m[1];\n\n        if (!open()) { return error('@keyframes missing \\'{\\''); }\n\n        let frame,\n            frames = comments();\n        while ((frame = keyframe())) {\n            frames.push(frame);\n            frames = frames.concat(comments());\n        }\n\n        if (!close()) { return error('@keyframes missing \\'}\\''); }\n\n        return { type: 'keyframes', name: name, vendor: vendor, keyframes: frames };\n    }\n\n    // @ Rules\n    // -------------------------------------------------------------------------\n    function at_page() {\n        const m = match(/^@page */);\n        if (m) {\n            const sel = selector() || [];\n            return { type: 'page', selectors: sel, declarations: declarations() };\n        }\n    }\n    function at_fontface() {\n        const m = match(/^@font-face\\s*/);\n        if (m) { return { type: 'font-face', declarations: declarations() }; }\n    }\n    function at_supports() {\n        const m = match(/^@supports *([^{]+)/);\n        if (m) { return { type: 'supports', supports: m[1].trim(), rules: rules() }; }\n    }\n    function at_host() {\n        const m = match(/^@host\\s*/);\n        if (m) { return { type: 'host', rules: rules() }; }\n    }\n    function at_media() {\n        const m = match(/^@media *([^{]+)/);\n        if (m) { return { type: 'media', media: m[1].trim(), rules: rules() }; }\n    }\n    function at_custom_m() {\n        const m = match(/^@custom-media\\s+(--[^\\s]+)\\s*([^{;]+);/);\n        if (m) { return { type: 'custom-media', name: m[1].trim(), media: m[2].trim() }; }\n    }\n    function at_document() {\n        const m = match(/^@([-\\w]+)?document *([^{]+)/);\n        // FIXED\n        if (m) { return { type: 'document', document: m[2].trim(), vendor: m[1] ? m[1].trim() : null, rules: rules() }; }\n    }\n    function at_x() {\n        const m = match(/^@(import|charset|namespace)\\s*([^;]+);/);\n        if (m) { return { type: m[1], name: m[2].trim() }; }\n    }\n    function at_rule() {\n        whitespace();\n        if (css[0] === '@') { return at_keyframes() || at_supports() || at_host() || at_media() || at_custom_m() || at_page() || at_document() || at_fontface() || at_x(); }\n    }\n\n    // Rules\n    // -------------------------------------------------------------------------\n    function rule() {\n        const sel = selector() || [];\n        if (!sel.length) { error('selector missing'); }\n\n        const decls = declarations();\n\n        return { type: 'rule', selectors: sel, declarations: decls };\n    }\n    function rules(core) {\n        if (!core && !open()) { return error('missing \\'{\\''); }\n\n        let node,\n            rules = comments();\n\n        while (css.length && (core || css[0] !== '}') && (node = at_rule() || rule())) {\n            rules.push(node);\n            rules = rules.concat(comments());\n        }\n\n        if (!core && !close()) { return error('missing \\'}\\''); }\n\n        return rules;\n    }\n\n    return { type: 'stylesheet', stylesheet: { rules: rules(true), errors: errors } };\n}\n\n\n// Exports\n// =============================================================================\nexport default cssParse;\n","/**\n * Based on rework-vars by reworkcss\n * https://github.com/reworkcss/rework-vars\n */\n\n\n// Dependencies\n// =============================================================================\nimport balanced     from 'balanced-match';\nimport mergeDeep    from './merge-deep';\nimport parseCss     from './parse-css';\nimport stringifyCss from './stringify-css';\n\n\n// Constants & Variables\n// =============================================================================\nconst VAR_PROP_IDENTIFIER = '--';\nconst VAR_FUNC_IDENTIFIER = 'var';\nconst reVarProp = /^--/;\nconst reVarVal  = /^var(.*)/;\n\n\n// Functions\n// =============================================================================\n/**\n * Transforms W3C-style CSS variables to static values and returns an updated\n * CSS string.\n *\n * @param {object}   cssText CSS containing variable definitions and functions\n * @param {object}   [options] Options object\n * @param {boolean}  [options.onlyVars=true] Remove declarations that do not\n *                   contain a CSS variable from the return value. Note that\n *                   @font-face and @keyframe rules require all declarations to\n *                   be returned if a CSS variable is used.\n * @param {boolean}  [options.preserve=true] Preserve CSS variable definitions\n *                   and functions in the return value, allowing \"live\" variable\n *                   updates via JavaScript to continue working in browsers with\n *                   native CSS variable support.\n * @param {object}   [options.variables={}] CSS variable definitions to include\n *                   during transformation. Can be used to add new override\n *                   exisitng definitions.\n * @param {function} [options.onWarning] Callback on each transformation\n *                   warning. Passes 1) warningMessage as an argument.\n * @returns {string}\n */\nfunction transformVars(cssText, options = {}) {\n    const defaults = {\n        onlyVars : true,\n        preserve : true,\n        variables: {},\n        onWarning() {}\n    };\n    const map      = {};\n    const settings = mergeDeep(defaults, options);\n\n    // Convert cssText to AST (this could throw errors)\n    const cssTree = parseCss(cssText);\n\n    // Remove non-vars\n    if (settings.onlyVars) {\n        cssTree.stylesheet.rules = filterVars(cssTree.stylesheet.rules);\n    }\n\n    // Define variables\n    cssTree.stylesheet.rules.forEach(function(rule) {\n        const varNameIndices = [];\n\n        if (rule.type !== 'rule') {\n            return;\n        }\n\n        // only variables declared for `:root` are supported\n        if (rule.selectors.length !== 1 || rule.selectors[0] !== ':root') {\n            return;\n        }\n\n        rule.declarations.forEach(function(decl, i) {\n            const prop = decl.property;\n            const value = decl.value;\n\n            if (prop && prop.indexOf(VAR_PROP_IDENTIFIER) === 0) {\n                map[prop] = value;\n                varNameIndices.push(i);\n            }\n        });\n\n        // optionally remove `--*` properties from the rule\n        if (!settings.preserve) {\n            for (let i = varNameIndices.length - 1; i >= 0; i--) {\n                rule.declarations.splice(varNameIndices[i], 1);\n            }\n        }\n    });\n\n    // Handle variables defined in settings.variables\n    if (Object.keys(settings.variables).length) {\n        const newRule = {\n            declarations: [],\n            selectors   : [':root'],\n            type        : 'rule'\n        };\n\n        Object.keys(settings.variables).forEach(function(key) {\n            // Normalize variables by ensuring all start with leading '--'\n            const varName  = `--${key.replace(/^-+/, '')}`;\n            const varValue = settings.variables[key];\n\n            // Update internal map value with settings.variables value\n            map[varName] = varValue;\n\n            // Add new declaration to newRule\n            newRule.declarations.push({\n                type    : 'declaration',\n                property: varName,\n                value   : varValue\n            });\n        });\n\n        // Append new :root ruleset\n        if (settings.preserve) {\n            cssTree.stylesheet.rules.push(newRule);\n        }\n    }\n\n    // Resolve variables\n    walkCss(cssTree.stylesheet, function(declarations, node) {\n        let decl;\n        let resolvedValue;\n        let value;\n\n        for (let i = 0; i < declarations.length; i++) {\n            decl = declarations[i];\n            value = decl.value;\n\n            // skip comments\n            if (decl.type !== 'declaration') {\n                continue;\n            }\n\n            // skip values that don't contain variable functions\n            if (!value || value.indexOf(VAR_FUNC_IDENTIFIER + '(') === -1) {\n                continue;\n            }\n\n            resolvedValue = resolveValue(value, map, settings);\n\n            if (resolvedValue !== 'undefined') {\n                if (!settings.preserve) {\n                    decl.value = resolvedValue;\n                }\n                else {\n                    declarations.splice(i, 0, {\n                        type    : decl.type,\n                        property: decl.property,\n                        value   : resolvedValue\n                    });\n\n                    // skip ahead of preserved declaration\n                    i++;\n                }\n            }\n        }\n    });\n\n    // Return CSS string\n    return stringifyCss(cssTree);\n}\n\n\n// Functions (Private)\n// =============================================================================\n/**\n * Filters rules recursively, retaining only declarations that contain either a\n * CSS variable definition (property) or function (value). Maintains all\n * declarations for @font-face and @keyframes rules that contain a CSS\n * definition or function.\n *\n * @param {array} rules\n * @returns {array}\n */\nfunction filterVars(rules) {\n    return rules.filter(rule => {\n        // Rule, @font-face, @host, @page\n        if (rule.declarations) {\n            // @font-face rules require all declarations to be retained if any\n            // declaration contains a CSS variable definition or value.\n            // For other rules, any declaration that does not contain a CSS\n            // variable can be removed.\n            let declArray = rule.type === 'font-face' ? [] : rule.declarations;\n\n            declArray = rule.declarations.filter(d => reVarProp.test(d.property) || reVarVal.test(d.value));\n\n            return Boolean(declArray.length);\n        }\n        // @keyframes\n        else if (rule.keyframes) {\n            // @keyframe rules require all declarations to be retained if any\n            // declaration contains a CSS variable definition or value.\n            return Boolean(rule.keyframes.filter(k =>\n                Boolean(k.declarations.filter(d => reVarProp.test(d.property) || reVarVal.test(d.value)).length)\n            ).length);\n        }\n        // @document, @media, @supports\n        else if (rule.rules) {\n            rule.rules = filterVars(rule.rules).filter(r => r.declarations.length);\n\n            return Boolean(rule.rules.length);\n        }\n\n        return true;\n    });\n}\n\n/**\n * Resolve CSS variables in a value\n *\n * The second argument to a CSS variable function, if provided, is a fallback\n * value, which is used as the substitution value when the referenced variable\n * is invalid.\n *\n * var(name[, fallback])\n *\n * @param {string} value A property value containing a CSS variable function\n * @param {object} map A map of variable names and values\n * @param {object} settings Settings object passed from transformVars()\n * @return {string} A new value with CSS variables substituted or using fallback\n */\nfunction resolveValue(value, map, settings) {\n    // matches `name[, fallback]`, captures 'name' and 'fallback'\n    const RE_VAR = /([\\w-]+)(?:\\s*,\\s*)?(.*)?/;\n    const balancedParens = balanced('(', ')', value);\n    const varStartIndex  = value.indexOf('var(');\n    const varRef         = balanced('(', ')', value.substring(varStartIndex)).body;\n    const warningIntro   = 'CSS transform warning:';\n\n    /* istanbul ignore next */\n    if (!balancedParens) {\n        settings.onWarning(`${warningIntro} missing closing \")\" in the value \"${value}\"`);\n    }\n\n    /* istanbul ignore next */\n    if (varRef === '') {\n        settings.onWarning(`${warningIntro} var() must contain a non-whitespace string`);\n    }\n\n    const varFunc = VAR_FUNC_IDENTIFIER + '(' + varRef + ')';\n\n    const varResult = varRef.replace(RE_VAR, function(_, name, fallback) {\n        const replacement = map[name];\n\n        if (!replacement && !fallback) {\n            settings.onWarning(`${warningIntro} variable \"${name}\" is undefined`);\n        }\n\n        if (!replacement && fallback) {\n            return fallback;\n        }\n\n        return replacement;\n    });\n\n    // resolve the variable\n    value = value.split(varFunc).join(varResult);\n\n    // recursively resolve any remaining variables in the value\n    if (value.indexOf(VAR_FUNC_IDENTIFIER) !== -1) {\n        value = resolveValue(value, map, settings);\n    }\n\n    return value;\n}\n\n/**\n * Visit `node` declarations recursively and invoke `fn(declarations, node)`.\n *\n * Based on rework-visit by reworkcss\n * https://github.com/reworkcss/rework-visit\n *\n * @param {object} node\n * @param {function} fn\n */\nfunction walkCss(node, fn){\n    node.rules.forEach(function(rule){\n        // @media etc\n        if (rule.rules) {\n            walkCss(rule, fn);\n\n            return;\n        }\n\n        // keyframes\n        if (rule.keyframes) {\n            rule.keyframes.forEach(function(keyframe){\n                if (keyframe.type === 'keyframe') {\n                    fn(keyframe.declarations, rule);\n                }\n            });\n\n            return;\n        }\n\n        // @charset, @import etc\n        if (!rule.declarations) {\n            return;\n        }\n\n        fn(rule.declarations, node);\n    });\n}\n\n\n// Exports\n// =============================================================================\nexport default transformVars;\n","/**\n * Based on css parser/compiler by NxChg\n * https://github.com/NxtChg/pieces/tree/master/js/css_parser\n */\n\n\n// Functions\n// =============================================================================\n/**\n * Compiles CSS AST to string\n *\n * @param {object}   tree CSS AST object\n * @param {string}   [delim=''] CSS rule delimiter\n * @param {function} cb Function to be called before each node is processed\n * @returns {string}\n */\nfunction stringifyCss(tree, delim = '', cb) {\n    const renderMethods = {\n        charset(node) {\n            return '@charset ' + node.name + ';';\n        },\n        comment(node) {\n            return '';\n        },\n        'custom-media'(node) {\n            return '@custom-media ' + node.name + ' ' + node.media + ';';\n        },\n        declaration(node) {\n            return node.property + ':' + node.value + ';';\n        },\n        document(node) {\n            return '@' + (node.vendor || '') + 'document ' + node.document + '{' + visit(node.rules) + '}';\n        },\n        'font-face'(node) {\n            return '@font-face' + '{' + visit(node.declarations) + '}';\n        },\n        host(node) {\n            return '@host' + '{' + visit(node.rules) + '}';\n        },\n        import(node) {\n            // FIXED\n            return '@import ' + node.name + ';';\n        },\n        keyframe(node) {\n            return node.values.join(',') + '{' + visit(node.declarations) + '}';\n        },\n        keyframes(node) {\n            return '@' + (node.vendor || '') + 'keyframes ' + node.name + '{' + visit(node.keyframes) + '}';\n        },\n        media(node) {\n            return '@media ' + node.media + '{' + visit(node.rules) + '}';\n        },\n        namespace(node) {\n            return '@namespace ' + node.name + ';';\n        },\n        page(node) {\n            return '@page ' + (node.selectors.length ? node.selectors.join(', ') : '') + '{' + visit(node.declarations) + '}';\n        },\n        rule(node) {\n            const decls = node.declarations;\n\n            if (decls.length) {\n                return node.selectors.join(',') + '{' + visit(decls) + '}';\n            }\n        },\n        supports(node) {\n            // FIXED\n            return '@supports ' + node.supports + '{' + visit(node.rules) + '}';\n        }\n    };\n\n    function visit(nodes) {\n        let buf = '';\n\n        for (let i = 0; i < nodes.length; i++) {\n            const n = nodes[i];\n\n            if (cb) {\n                cb(n);\n            }\n\n            const txt = renderMethods[n.type](n);\n\n            if (txt) {\n                buf += txt;\n\n                if (txt.length && n.selectors) {\n                    buf += delim;\n                }\n            }\n        }\n\n        return buf;\n    }\n\n    return visit(tree.stylesheet.rules);\n}\n\n\n// Exports\n// =============================================================================\nexport default stringifyCss;\n","// Dependencies\n// =============================================================================\nimport getCssData          from 'get-css-data';\nimport mergeDeep           from './merge-deep';\nimport transformCss        from './transform-css';\nimport { name as pkgName } from '../package.json';\n\n\n// Constants & Variables\n// =============================================================================\nconst defaults = {\n    // Sources\n    include    : 'style,link[rel=stylesheet]',\n    exclude    : '',\n    // Options\n    appendStyle: true,  // cssVars\n    onlyLegacy : true,  // cssVars\n    onlyVars   : true,  // cssVars, transformCss\n    preserve   : true,  // transformCss\n    silent     : false, // cssVars\n    variables  : {},    // transformCss\n    // Callbacks\n    onSuccess() {},     // cssVars\n    onError() {},       // cssVars\n    onWarning() {},     // transformCss\n    onComplete() {}     // cssVars\n};\n// Regex: CSS variable :root declarations and var() function values\nconst reCssVars = /(?:(?::root\\s*{\\s*[^;]*;*\\s*)|(?:var\\(\\s*))(--[^:)]+)(?:\\s*[:)])/;\n\n\n\n\n// Functions\n// =============================================================================\n/**\n * Description\n *\n * @preserve\n * @param {object}   [options] Options object\n * @param {string}   [options.include=\"style,link[rel=stylesheet]\"] CSS selector\n *                   matching <link> and <style> nodes to include\n * @param {string}   [options.exclude=\"\"] CSS selector matching <link> and\n *                   <style> nodes to exclude\n * @param {boolean}  [options.appendStyle=true] Append <style> node containing\n *                   updated CSS to DOM\n * @param {boolean}  [options.onlyLegacy=true] Only process CSS variables in\n *                   browsers that lack native support\n * @param {boolean}  [options.onlyVars=true] Remove declarations that do not\n *                   contain a CSS variable from the return value. Note that\n *                   font-face and keyframe rules require all declarations to be\n *                   returned if a CSS variable is used.\n * @param {boolean}  [options.preserve=true] Preserve CSS variable definitions\n *                   and functions in the return value, allowing \"live\" variable\n *                   updates via JavaScript to continue working in browsers with\n *                   native CSS variable support.\n * @param {boolean}  [options.silent=false] Prevent console warnign and error\n *                   messages\n * @param {object}   [options.variables={}] CSS variable definitions to include\n *                   during transformation. Can be used to add new override\n *                   exisitng definitions.\n * @param {function} [options.onSuccess] Callback after all stylesheets have\n *                   been processed succesfully. Passes 1) a CSS string with CSS\n *                   variable values resolved as an argument. Modifying the CSS\n *                   appended when 'appendStyle' is 'true' can be done by\n *                   returning a string value from this funtion (or 'false' to\n *                   skip).\n * @param {function} [options.onError] Callback on each error. Passes 1) an\n *                   error message, and 2) source node reference as arguments.\n * @param {function} [options.onWarning] Callback on each warning. Passes 1) a\n *                   warning message as an argument.\n * @param {function} [options.onComplete] Callback after all stylesheets have\n *                   been processed succesfully and <style> node containing\n *                   updated CSS has been appended to the DOM (based on\n *                   'appendStyle' setting. 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An additional\n                // filter is used in the parser to remove individual\n                // declarations.\n                filter : settings.onlyVars ? reCssVars : null,\n                onComplete(cssText, cssArray, nodeArray) {\n                    let styleNode = null;\n\n                    try {\n                        cssText = transformCss(cssText, {\n                            onlyVars : settings.onlyVars,\n                            preserve : settings.preserve,\n                            variables: settings.variables,\n                            onWarning: handleWarning\n                        });\n\n                        // Success if an error was not been throw during\n                        // transformation. Store the onSuccess return value,\n                        // which allows modifying cssText before passing to\n                        // onComplete and/or appending to new <style> node.\n                        const returnVal = settings.onSuccess(cssText);\n\n                        // Set cssText to return value (if provided)\n                        cssText = returnVal === false ? 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the error thrown was not due to\n                        // transformCss, handle the original error.\n                        /* istanbul ignore next */\n                        if (!errorThrown) {\n                            handleError(err.message || err);\n                        }\n                    }\n\n                    settings.onComplete(cssText, styleNode);\n                },\n                onError(xhr, node, url) {\n                    const errorMsg = `Unable to process ${url} (${xhr.status} - ${xhr.statusText}}`;\n\n                    handleError(errorMsg, node);\n                }\n            });\n        }\n    }\n    // Delay function until DOMContentLoaded event is fired\n    /* istanbul ignore next */\n    else {\n        document.addEventListener('DOMContentLoaded', function init(evt) {\n            cssVars(options);\n\n            document.removeEventListener('DOMContentLoaded', init);\n        });\n    }\n}\n\n\n// Functions (Private)\n// 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\ No newline at end of file
diff --git a/karma.conf.js b/karma.conf.js
new file mode 100644
index 0000000..b904175
--- /dev/null
+++ b/karma.conf.js
@@ -0,0 +1,186 @@
+// Dependencies
+// =============================================================================
+const pkg       = require('./package');
+const saucelabs = require('./saucelabs.config');
+
+
+// Variables
+// =============================================================================
+const files = {
+    serve: './tests/fixtures/**/*.*',
+    test : './tests/**/*.test.js'
+};
+
+
+// Local config
+// =============================================================================
+const localConfig = {
+    // Add browsers via Karma launchers
+    // https://www.npmjs.com/search?q=karma+launcher
+    browsers: [
+        'ChromeHeadless'
+    ],
+    files: [
+        'node_modules/babel-polyfill/dist/polyfill.js',
+        files.test,
+        // Serve files for accessing in tests via AJAX
+        // Ex: /base/[files.serve]/path/to/file
+        { pattern: files.serve, included: false, served: true, watched: true }
+    ],
+    preprocessors: {
+        [files.test]: ['eslint', 'webpack', 'sourcemap']
+    },
+    frameworks: ['mocha', 'chai'],
+    reporters : ['mocha', 'coverage'],
+    webpack   : {
+        devtool: 'inline-source-map',
+        module: {
+            rules: [{
+                test   : /\.js$/,
+                exclude: [/node_modules/],
+                use    : [{
+                    loader : 'babel-loader',
+                    options: {
+                        presets: [
+                            ['env', {
+                                targets: {
+                                    browsers: ['ie >= 9']
+                                }
+                            }]
+                        ],
+                        plugins: [
+                            ['istanbul', {
+                                exclude: [
+                                    '**/*.test.js',
+                                    'tests/helpers/*'
+                                ]
+                            }]
+                        ]
+                    },
+                }]
+            }]
+        }
+    },
+    webpackMiddleware: {
+        // From the docs:
+        // "With noInfo enabled, messages like the webpack bundle information
+        // that is shown when starting up and after each save, will be hidden.
+        // Errors and warnings will still be shown."
+        // https://webpack.js.org/configuration/dev-server/#devserver-noinfo-
+        noInfo: true
+    },
+    // Code coverage
+    // https://www.npmjs.com/package/karma-coverage
+    coverageReporter: {
+        reporters: [
+            { type: 'html' },
+            { type: 'lcovonly' },
+            { type: 'text-summary' }
+        ]
+    },
+    // Mocha reporter
+    // https://www.npmjs.com/package/karma-mocha-reporter
+    mochaReporter: {
+        output: 'autowatch'
+    },
+    port       : 9876,
+    colors     : true,
+    autoWatch  : false,
+    singleRun  : true,
+    concurrency: Infinity
+};
+
+
+// Remote config
+// =============================================================================
+const remoteConfig = Object.assign({}, localConfig, {
+    // SauceLabs browers (see platform configurator below)
+    // https://wiki.saucelabs.com/display/DOCS/Platform+Configurator#/
+    customLaunchers: {
+        sl_chrome: {
+            base       : 'SauceLabs',
+            browserName: 'Chrome',
+            platform   : 'Windows 10',
+            version    : '26.0'
+        },
+        sl_edge: {
+            base       : 'SauceLabs',
+            browserName: 'MicrosoftEdge',
+            platform   : 'Windows 10',
+            version    : '13.10586'
+        },
+        sl_firefox: {
+            base       : 'SauceLabs',
+            browserName: 'Firefox',
+            platform   : 'Windows 10',
+            version    : '30'
+        },
+        sl_ie_11: {
+            base       : 'SauceLabs',
+            browserName: 'Internet Explorer',
+            platform   : 'Windows 10',
+            version    : '11.0'
+        },
+        sl_ie_10: {
+            base       : 'SauceLabs',
+            browserName: 'Internet Explorer',
+            platform   : 'Windows 8',
+            version    : '10.0'
+        },
+        sl_ie_9: {
+            base       : 'SauceLabs',
+            browserName: 'Internet Explorer',
+            platform   : 'Windows 7',
+            version    : '9.0'
+        },
+        sl_safari: {
+            base       : 'SauceLabs',
+            browserName: 'Safari',
+            platform   : 'OS X 10.9',
+            version    : '7.0'
+        }
+    },
+    // Set browsers to customLaunchers
+    get browsers() {
+        return Object.keys(this.customLaunchers);
+    },
+    // SauceLab settings
+    sauceLabs: {
+        username : saucelabs.username || process.env.SAUCE_USERNAME,
+        accessKey: saucelabs.accessKey || process.env.SAUCE_ACCESS_KEY,
+        testName : `${pkg.name} (karma)`
+    }
+});
+
+
+// Export
+// =============================================================================
+module.exports = function(config) {
+    const isRemote   = Boolean(process.argv.indexOf('--remote') > -1);
+    const testConfig = isRemote ? remoteConfig : localConfig;
+
+    if (isRemote) {
+        // Disabled source maps to prevent SauceLabs timeouts
+        // https://github.com/karma-runner/karma-sauce-launcher/issues/95
+        testConfig.webpack.devtool = '';
+        testConfig.webpack.module.rules[0].use[0].options.sourceMap = false;
+
+        // Add SauceLabs reporter
+        testConfig.reporters.push('saucelabs');
+
+        // Remove text-summary reporter
+        testConfig.coverageReporter.reporters = testConfig.coverageReporter.reporters.filter(obj => obj.type !== 'text-summary');
+    }
+    else {
+        // eslint-disable-next-line
+        console.log([
+            '============================================================\n',
+            `KARMA: localhost:${testConfig.port}/debug.html\n`,
+            '============================================================\n'
+        ].join(''));
+    }
+
+    // Logging: LOG_DISABLE, LOG_ERROR, LOG_WARN, LOG_INFO, LOG_DEBUG
+    testConfig.logLevel = config.LOG_WARN;
+    config.set(testConfig);
+};
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..8180a79
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,9160 @@
+{
+  "name": "css-vars-ponyfill",
+  "version": "0.0.1",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "JSONStream": {
+      "version": "1.3.2",
+      "resolved": "https://registry.npmjs.org/JSONStream/-/JSONStream-1.3.2.tgz",
+      "integrity": "sha1-wQI3G27Dp887hHygDCC7D85Mbeo=",
+      "dev": true,
+      "requires": {
+        "jsonparse": "1.3.1",
+        "through": "2.3.8"
+      }
+    },
+    "abbrev": {
+      "version": "1.0.9",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz",
+      "integrity": "sha1-kbR5JYinc4wl813W9jdSovh3YTU=",
+      "dev": true
+    },
+    "accepts": {
+      "version": "1.3.3",
+      "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.3.tgz",
+      "integrity": "sha1-w8p0NJOGSMPg2cHjKN1otiLChMo=",
+      "dev": true,
+      "requires": {
+        "mime-types": "2.1.17",
+        "negotiator": "0.6.1"
+      }
+    },
+    "acorn": {
+      "version": "5.3.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.3.0.tgz",
+      "integrity": "sha512-Yej+zOJ1Dm/IMZzzj78OntP/r3zHEaKcyNoU2lAaxPtrseM6rF0xwqoz5Q5ysAiED9hTjI2hgtvLXitlCN1/Ug==",
+      "dev": true
+    },
+    "acorn-dynamic-import": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/acorn-dynamic-import/-/acorn-dynamic-import-2.0.2.tgz",
+      "integrity": "sha1-x1K9IQvvZ5UBtsbLf8hPj0cVjMQ=",
+      "dev": true,
+      "requires": {
+        "acorn": "4.0.13"
+      },
+      "dependencies": {
+        "acorn": {
+          "version": "4.0.13",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-4.0.13.tgz",
+          "integrity": "sha1-EFSVrlNh1pe9GVyCUZLhrX8lN4c=",
+          "dev": true
+        }
+      }
+    },
+    "acorn-jsx": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz",
+      "integrity": "sha1-r9+UiPsezvyDSPb7IvRk4ypYs2s=",
+      "dev": true,
+      "requires": {
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+        "acorn": {
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+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-3.3.0.tgz",
+          "integrity": "sha1-ReN/s56No/JbruP/U2niu18iAXo=",
+          "dev": true
+        }
+      }
+    },
+    "addressparser": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/addressparser/-/addressparser-1.0.1.tgz",
+      "integrity": "sha1-R6++GiqSYhkdtoOOT9HTm0CCF0Y=",
+      "dev": true,
+      "optional": true
+    },
+    "adm-zip": {
+      "version": "0.4.7",
+      "resolved": "https://registry.npmjs.org/adm-zip/-/adm-zip-0.4.7.tgz",
+      "integrity": "sha1-hgbCy/HEJs6MjsABdER/1Jtur8E=",
+      "dev": true
+    },
+    "after": {
+      "version": "0.8.2",
+      "resolved": "https://registry.npmjs.org/after/-/after-0.8.2.tgz",
+      "integrity": "sha1-/ts5T58OAqqXaOcCvaI7UF+ufh8=",
+      "dev": true
+    },
+    "agent-base": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-2.1.1.tgz",
+      "integrity": "sha1-1t4Q1a9hMtW9aSQn1G/FOFOQlMc=",
+      "dev": true,
+      "requires": {
+        "extend": "3.0.1",
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+      "dependencies": {
+        "semver": {
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+          "resolved": "https://registry.npmjs.org/semver/-/semver-5.0.3.tgz",
+          "integrity": "sha1-d0Zt5YnNXTyV8TiqeLxWmjy10no=",
+          "dev": true
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+      }
+    },
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+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.5.2.tgz",
+      "integrity": "sha1-c7Xuyj+rZT49P5Qis0GtQiBdyWU=",
+      "dev": true,
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+        "fast-deep-equal": "1.0.0",
+        "fast-json-stable-stringify": "2.0.0",
+        "json-schema-traverse": "0.3.1"
+      }
+    },
+    "ajv-keywords": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ajv-keywords/-/ajv-keywords-2.1.1.tgz",
+      "integrity": "sha1-YXmX/F9gV2iUxDX5QNgZ4TW4B2I=",
+      "dev": true
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+        "longest": "1.0.1",
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+    },
+    "amdefine": {
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+      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
+      "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
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+      "optional": true,
+      "requires": {
+        "bitsyntax": "0.0.4",
+        "bluebird": "3.5.1",
+        "buffer-more-ints": "0.0.2",
+        "readable-stream": "1.1.14",
+        "safe-buffer": "5.1.1"
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+        "isarray": {
+          "version": "0.0.1",
+          "resolved": "https://registry.npmjs.org/isarray/-/isarray-0.0.1.tgz",
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+          "requires": {
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+            "inherits": "2.0.3",
+            "isarray": "0.0.1",
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+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
+      "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE=",
+      "dev": true
+    },
+    "yallist": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
+      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
+      "dev": true
+    },
+    "yargs": {
+      "version": "3.10.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz",
+      "integrity": "sha1-9+572FfdfB0tOMDnTvvWgdFDH9E=",
+      "dev": true,
+      "requires": {
+        "camelcase": "1.2.1",
+        "cliui": "2.1.0",
+        "decamelize": "1.2.0",
+        "window-size": "0.1.0"
+      },
+      "dependencies": {
+        "camelcase": {
+          "version": "1.2.1",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-1.2.1.tgz",
+          "integrity": "sha1-m7UwTS4LVmmLLHWLCKPqqdqlijk=",
+          "dev": true
+        }
+      }
+    },
+    "yargs-parser": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-7.0.0.tgz",
+      "integrity": "sha1-jQrELxbqVd69MyyvTEA4s+P139k=",
+      "dev": true,
+      "requires": {
+        "camelcase": "4.1.0"
+      },
+      "dependencies": {
+        "camelcase": {
+          "version": "4.1.0",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-4.1.0.tgz",
+          "integrity": "sha1-1UVjW+HjPFQmScaRc+Xeas+uNN0=",
+          "dev": true
+        }
+      }
+    },
+    "yeast": {
+      "version": "0.1.2",
+      "resolved": "https://registry.npmjs.org/yeast/-/yeast-0.1.2.tgz",
+      "integrity": "sha1-AI4G2AlDIMNy28L47XagymyKxBk=",
+      "dev": true
+    },
+    "zip-stream": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/zip-stream/-/zip-stream-1.2.0.tgz",
+      "integrity": "sha1-qLxF9MG0lpnGuQGYuqyqzbzUugQ=",
+      "dev": true,
+      "requires": {
+        "archiver-utils": "1.3.0",
+        "compress-commons": "1.2.2",
+        "lodash": "4.17.4",
+        "readable-stream": "2.3.3"
+      }
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..b144784
--- /dev/null
+++ b/package.json
@@ -0,0 +1,80 @@
+{
+  "name": "css-vars-ponyfill",
+  "version": "0.0.1",
+  "description": "CSS custom property (aka \"CSS variable\") ponyfill",
+  "author": "John Hildenbiddle <http://hildenbiddle.com>",
+  "license": "MIT",
+  "homepage": "https://github.com/jhildenbiddle/css-vars-ponyfill",
+  "repository": {
+    "type": "git",
+    "url": "git+https://jhildenbiddle@github.com/jhildenbiddle/css-vars-ponyfill.git"
+  },
+  "bugs": {
+    "url": "https://github.com/jhildenbiddle/css-vars-ponyfill/issues"
+  },
+  "keywords": [
+    "css",
+    "custom",
+    "es6",
+    "javascript",
+    "js",
+    "module",
+    "polyfill",
+    "ponyfill",
+    "properties",
+    "variables"
+  ],
+  "browserslist": [
+    "ie >= 9"
+  ],
+  "main": "dist/css-vars-ponyfill.js",
+  "module": "dist/css-vars-ponyfill.esm.js",
+  "unpkg": "dist/css-vars-ponyfill.min.js",
+  "scripts": {
+    "prepare": "rimraf dist/* && npm run build",
+    "build": "rollup -c",
+    "start": "rimraf coverage/* dist/* && npm run build -- --watch",
+    "test": "rimraf coverage/* && karma start",
+    "test-watch": "npm test -- --auto-watch --no-single-run",
+    "test-remote": "npm test -- --remote",
+    "preversion": "npm test",
+    "version": "npm run build && git add -A dist"
+  },
+  "devDependencies": {
+    "axios": "^0.17.1",
+    "babel-core": "^6.26.0",
+    "babel-loader": "^7.1.2",
+    "babel-plugin-external-helpers": "^6.22.0",
+    "babel-plugin-istanbul": "^4.1.5",
+    "babel-polyfill": "^6.26.0",
+    "babel-preset-env": "^1.6.1",
+    "chai": "^4.1.2",
+    "create-elms": "^1.0.4",
+    "eslint": "^4.12.1",
+    "eslint-plugin-chai-expect": "^1.1.1",
+    "eslint-plugin-mocha": "^4.11.0",
+    "get-css-data": "^1.1.0",
+    "karma": "^2.0.0",
+    "karma-chai": "^0.1.0",
+    "karma-chrome-launcher": "^2.2.0",
+    "karma-coverage": "^1.1.1",
+    "karma-eslint": "^2.2.0",
+    "karma-mocha": "^1.3.0",
+    "karma-mocha-reporter": "^2.2.5",
+    "karma-sauce-launcher": "^1.2.0",
+    "karma-sourcemap-loader": "^0.3.7",
+    "karma-webpack": "^2.0.6",
+    "lodash.merge": "^4.6.0",
+    "mocha": "^5.0.0",
+    "rimraf": "^2.6.2",
+    "rollup": "^0.54.1",
+    "rollup-plugin-babel": "^3.0.2",
+    "rollup-plugin-commonjs": "^8.2.6",
+    "rollup-plugin-eslint": "^4.0.0",
+    "rollup-plugin-json": "^2.3.0",
+    "rollup-plugin-node-resolve": "^3.0.0",
+    "rollup-plugin-uglify": "^2.0.1",
+    "uglify-es": "^3.3.4",
+    "webpack": "^3.10.0"
+  }
+}
diff --git a/rollup.config.js b/rollup.config.js
new file mode 100644
index 0000000..c3f5095
--- /dev/null
+++ b/rollup.config.js
@@ -0,0 +1,143 @@
+// Dependencies
+// =============================================================================
+import babel      from 'rollup-plugin-babel';
+import commonjs   from 'rollup-plugin-commonjs';
+import eslint     from 'rollup-plugin-eslint';
+import json       from 'rollup-plugin-json';
+import merge      from 'lodash.merge';
+import pkg        from './package.json';
+import resolve    from 'rollup-plugin-node-resolve';
+import uglify     from 'rollup-plugin-uglify';
+import { minify } from 'uglify-es';
+
+const path      = require('path');
+const entryFile = path.resolve(__dirname, 'src', 'index.js');
+const fnName    = 'cssVars';
+
+
+// Constants & Variables
+// =============================================================================
+const bannerData = [
+    `${pkg.name}`,
+    `v${pkg.version}`,
+    `${pkg.homepage}`,
+    `(c) ${(new Date()).getFullYear()} ${pkg.author}`,
+    `${pkg.license} license`
+];
+const settings = {
+    eslint: {
+        exclude       : ['node_modules/**', './package.json'],
+        throwOnWarning: false,
+        throwOnError  : true
+    },
+    babel: {
+        exclude: ['node_modules/**'],
+        presets: [
+            ['env', {
+                modules: false,
+                targets: {
+                    browsers: ['ie >= 9']
+                }
+            }]
+        ],
+        plugins: [
+            'external-helpers'
+        ]
+    },
+    uglify: {
+        beautify: {
+            compress: false,
+            mangle  : false,
+            output: {
+                beautify: true,
+                comments: /(?:^!|@(?:license|preserve))/
+            }
+        },
+        minify: {
+            compress: true,
+            mangle  : true,
+            output  : {
+                comments: /^!/
+            }
+        }
+    }
+};
+
+
+// Config
+// =============================================================================
+// Base
+const config = {
+    input : entryFile,
+    output: {
+        file     : path.resolve(__dirname, 'dist', `${pkg.name}.js`),
+        name     : fnName,
+        banner   : `/*!\n * ${ bannerData.join('\n * ') }\n */`,
+        sourcemap: true
+    },
+    plugins: [
+        resolve(),
+        commonjs(),
+        json(),
+        eslint(settings.eslint),
+        babel(settings.babel)
+    ],
+    watch: {
+        clearScreen: false
+    }
+};
+
+// Output
+// -----------------------------------------------------------------------------
+// ES Module
+const esm = merge({}, config, {
+    output: {
+        file  : config.output.file.replace(/\.js$/, '.esm.js'),
+        format: 'es'
+    },
+    plugins: [
+        uglify(settings.uglify.beautify, minify)
+    ]
+});
+
+// ES Module (Minified)
+const esmMinified = merge({}, config, {
+    output: {
+        file  : esm.output.file.replace(/\.js$/, '.min.js'),
+        format: esm.output.format
+    },
+    plugins: [
+        uglify(settings.uglify.minify, minify)
+    ]
+});
+
+// UMD
+const umd = merge({}, config, {
+    output: {
+        format: 'umd'
+    },
+    plugins: [
+        uglify(settings.uglify.beautify, minify)
+    ]
+});
+
+// UMD (Minified)
+const umdMinified = merge({}, config, {
+    output: {
+        file  : umd.output.file.replace(/\.js$/, '.min.js'),
+        format: umd.output.format
+    },
+    plugins: [
+        uglify(settings.uglify.minify, minify)
+    ]
+});
+
+
+// Exports
+// =============================================================================
+export default [
+    esm,
+    esmMinified,
+    umd,
+    umdMinified
+];
diff --git a/saucelabs.config.js b/saucelabs.config.js
new file mode 100644
index 0000000..3147dc5
--- /dev/null
+++ b/saucelabs.config.js
@@ -0,0 +1,6 @@
+// Export
+// =============================================================================
+module.exports = {
+    username : null,
+    accessKey: null
+};
diff --git a/src/index.js b/src/index.js
new file mode 100644
index 0000000..bbe0443
--- /dev/null
+++ b/src/index.js
@@ -0,0 +1,249 @@
+// Dependencies
+// =============================================================================
+import getCssData          from 'get-css-data';
+import mergeDeep           from './merge-deep';
+import transformCss        from './transform-css';
+import { name as pkgName } from '../package.json';
+
+
+// Constants & Variables
+// =============================================================================
+const defaults = {
+    // Sources
+    include    : 'style,link[rel=stylesheet]',
+    exclude    : '',
+    // Options
+    appendStyle: true,  // cssVars
+    onlyLegacy : true,  // cssVars
+    onlyVars   : true,  // cssVars, transformCss
+    preserve   : true,  // transformCss
+    silent     : false, // cssVars
+    variables  : {},    // transformCss
+    // Callbacks
+    onSuccess() {},     // cssVars
+    onError() {},       // cssVars
+    onWarning() {},     // transformCss
+    onComplete() {}     // cssVars
+};
+// Regex: CSS variable :root declarations and var() function values
+const reCssVars = /(?:(?::root\s*{\s*[^;]*;*\s*)|(?:var\(\s*))(--[^:)]+)(?:\s*[:)])/;
+
+
+
+
+// Functions
+// =============================================================================
+/**
+ * Description
+ *
+ * @preserve
+ * @param {object}   [options] Options object
+ * @param {string}   [options.include="style,link[rel=stylesheet]"] CSS selector
+ *                   matching <link> and <style> nodes to include
+ * @param {string}   [options.exclude=""] CSS selector matching <link> and
+ *                   <style> nodes to exclude
+ * @param {boolean}  [options.appendStyle=true] Append <style> node containing
+ *                   updated CSS to DOM
+ * @param {boolean}  [options.onlyLegacy=true] Only process CSS variables in
+ *                   browsers that lack native support
+ * @param {boolean}  [options.onlyVars=true] Remove declarations that do not
+ *                   contain a CSS variable from the return value. Note that
+ *                   font-face and keyframe rules require all declarations to be
+ *                   returned if a CSS variable is used.
+ * @param {boolean}  [options.preserve=true] Preserve CSS variable definitions
+ *                   and functions in the return value, allowing "live" variable
+ *                   updates via JavaScript to continue working in browsers with
+ *                   native CSS variable support.
+ * @param {boolean}  [options.silent=false] Prevent console warnign and error
+ *                   messages
+ * @param {object}   [options.variables={}] CSS variable definitions to include
+ *                   during transformation. Can be used to add new override
+ *                   exisitng definitions.
+ * @param {function} [options.onSuccess] Callback after all stylesheets have
+ *                   been processed succesfully. Passes 1) a CSS string with CSS
+ *                   variable values resolved as an argument. Modifying the CSS
+ *                   appended when 'appendStyle' is 'true' can be done by
+ *                   returning a string value from this funtion (or 'false' to
+ *                   skip).
+ * @param {function} [options.onError] Callback on each error. Passes 1) an
+ *                   error message, and 2) source node reference as arguments.
+ * @param {function} [options.onWarning] Callback on each warning. Passes 1) a
+ *                   warning message as an argument.
+ * @param {function} [options.onComplete] Callback after all stylesheets have
+ *                   been processed succesfully and <style> node containing
+ *                   updated CSS has been appended to the DOM (based on
+ *                   'appendStyle' setting. Passes 1) a CSS string with CSS
+ *                   variable values resolved, and 2) a reference to the
+ *                   appended <style> node.
+ *
+ * @example
+ *
+ *   cssVars({
+ *     include    : 'style,link[rel="stylesheet"]', // default
+ *     exclude    : '',
+ *     appendStyle: true, // default
+ *     onlyLegacy : true, // default
+ *     onlyVars   : true, // default
+ *     preserve   : true, // default
+ *     silent     : false, // default
+ *     onError(message, node) {
+ *       // ...
+ *     },
+ *     onWarning(message) {
+ *       // ...
+ *     },
+ *     onSuccess(cssText) {
+ *       // ...
+ *     },
+ *     onComplete(cssText, styleNode) {
+ *       // ...
+ *     }
+ *   });
+ */
+function cssVars(options = {}) {
+    const settings = mergeDeep(defaults, options);
+
+    function handleError(message, sourceNode) {
+        /* istanbul ignore next */
+        if (!settings.silent) {
+            // eslint-disable-next-line
+            console.error(`${message}\n`, sourceNode);
+        }
+
+        settings.onError(message, sourceNode);
+    }
+
+    function handleWarning(message) {
+        /* istanbul ignore next */
+        if (!settings.silent) {
+            // eslint-disable-next-line
+            console.warn(message);
+        }
+
+        settings.onWarning(message);
+    }
+
+    // Verify readyState to ensure all <link> and <style> nodes are available
+    if (document.readyState !== 'loading') {
+        const hasNativeSupport = window.CSS && window.CSS.supports && window.CSS.supports('(--a: 0)');
+
+        // Lacks native support or onlyLegacy 'false'
+        if (!hasNativeSupport || !settings.onlyLegacy) {
+            const styleNodeId = pkgName;
+
+            getCssData({
+                include: settings.include,
+                // Always exclude styleNodeId element, which is the generated
+                // <style> node containing previously transformed CSS.
+                exclude: `#${styleNodeId}` + (settings.exclude ? `,${settings.exclude}` : ''),
+                // This filter does a test on each block of CSS. An additional
+                // filter is used in the parser to remove individual
+                // declarations.
+                filter : settings.onlyVars ? reCssVars : null,
+                onComplete(cssText, cssArray, nodeArray) {
+                    let styleNode = null;
+
+                    try {
+                        cssText = transformCss(cssText, {
+                            onlyVars : settings.onlyVars,
+                            preserve : settings.preserve,
+                            variables: settings.variables,
+                            onWarning: handleWarning
+                        });
+
+                        // Success if an error was not been throw during
+                        // transformation. Store the onSuccess return value,
+                        // which allows modifying cssText before passing to
+                        // onComplete and/or appending to new <style> node.
+                        const returnVal = settings.onSuccess(cssText);
+
+                        // Set cssText to return value (if provided)
+                        cssText = returnVal === false ? '' : returnVal || cssText;
+
+                        if (settings.appendStyle) {
+                            styleNode = document.querySelector(`#${styleNodeId}`) || document.createElement('style');
+                            styleNode.setAttribute('id', styleNodeId);
+
+                            if (styleNode.textContent !== cssText) {
+                                styleNode.textContent = cssText;
+                            }
+
+                            // Append <style> element to either the <head> or
+                            // <body> based on the position of last stylesheet
+                            // node.
+                            const styleTargetNode = document.querySelector(`body link[rel=stylesheet], body style:not(#${styleNodeId})`) ? document.body : document.head;
+                            const isNewTarget     = styleNode.parentNode !== styleTargetNode;
+                            const isLastStyleElm  = matchesSelector(styleNode, 'style:last-of-type');
+
+                            if (isNewTarget || !isLastStyleElm) {
+                                styleTargetNode.appendChild(styleNode);
+                            }
+                        }
+                    }
+                    catch(err) {
+                        let errorThrown = false;
+
+                        // Iterate cssArray to detect CSS text and node(s)
+                        // responsibile for error.
+                        cssArray.forEach((cssText, i) => {
+                            try {
+                                cssText = transformCss(cssText, settings);
+                            }
+                            catch(err) {
+                                const errorNode = nodeArray[i - 0];
+
+                                errorThrown = true;
+                                handleError(err.message, errorNode);
+                            }
+                        });
+
+                        // In the event the error thrown was not due to
+                        // transformCss, handle the original error.
+                        /* istanbul ignore next */
+                        if (!errorThrown) {
+                            handleError(err.message || err);
+                        }
+                    }
+
+                    settings.onComplete(cssText, styleNode);
+                },
+                onError(xhr, node, url) {
+                    const errorMsg = `Unable to process ${url} (${xhr.status} - ${xhr.statusText}}`;
+
+                    handleError(errorMsg, node);
+                }
+            });
+        }
+    }
+    // Delay function until DOMContentLoaded event is fired
+    /* istanbul ignore next */
+    else {
+        document.addEventListener('DOMContentLoaded', function init(evt) {
+            cssVars(options);
+
+            document.removeEventListener('DOMContentLoaded', init);
+        });
+    }
+}
+
+
+// Functions (Private)
+// =============================================================================
+/**
+ * Ponyfill for native Element.matches method
+ *
+ * @param   {object} elm - The element to test
+ * @param   {string} selector - The CSS selector to test against
+ * @returns {boolean}
+ */
+function matchesSelector(elm, selector) {
+    /* istanbul ignore next */
+    const matches = elm.matches || elm.matchesSelector || elm.webkitMatchesSelector || elm.mozMatchesSelector || elm.msMatchesSelector || elm.oMatchesSelector;
+
+    return matches.call(elm, selector);
+}
+
+
+// Export
+// =============================================================================
+export default cssVars;
diff --git a/src/merge-deep.js b/src/merge-deep.js
new file mode 100644
index 0000000..765990a
--- /dev/null
+++ b/src/merge-deep.js
@@ -0,0 +1,36 @@
+// Functions
+// =============================================================================
+/**
+ * Performs a deep merge of objects and returns new object. Does not modify
+ * objects (immutable) and merges arrays via concatenation.
+ *
+ * @param {...object} objects - Objects to merge
+ * @returns {object} New object with merged key/values
+ */
+function mergeDeep(...objects) {
+    const isObject = obj => obj instanceof Object && obj.constructor === Object;
+
+    return objects.reduce((prev, obj) => {
+        Object.keys(obj).forEach(key => {
+            const pVal = prev[key];
+            const oVal = obj[key];
+
+            // if (Array.isArray(pVal) && Array.isArray(oVal)) {
+            //     prev[key] = pVal.concat(...oVal);
+            // }
+            if (isObject(pVal) && isObject(oVal)) {
+                prev[key] = mergeDeep(pVal, oVal);
+            }
+            else {
+                prev[key] = oVal;
+            }
+        });
+
+        return prev;
+    }, {});
+}
+
+
+// Export
+// =============================================================================
+export default mergeDeep;
diff --git a/src/parse-css.js b/src/parse-css.js
new file mode 100644
index 0000000..11527f6
--- /dev/null
+++ b/src/parse-css.js
@@ -0,0 +1,255 @@
+/**
+ * Based on css parser/compiler by NxChg
+ * https://github.com/NxtChg/pieces/tree/master/js/css_parser
+ */
+
+
+// Functions
+// =============================================================================
+/**
+ * Parses CSS string and generates AST object
+ *
+ * @param {string} css The CSS stringt to be converted to an AST
+ * @returns {object}
+ */
+function cssParse(css) {
+    const errors = [];
+
+    // Errors
+    // -------------------------------------------------------------------------
+    function error(msg) {
+        throw new Error(`CSS parse error: ${msg}`);
+    }
+
+    // RegEx
+    // -------------------------------------------------------------------------
+    // Match regexp and return captures
+    function match(re) {
+        const m = re.exec(css);
+
+        if (m) {
+            css = css.slice(m[0].length);
+
+            return m;
+        }
+    }
+
+    function whitespace() {
+        match(/^\s*/);
+    }
+    function open() {
+        return match(/^{\s*/);
+    }
+    function close() {
+        return match(/^}/);
+    }
+
+    // Comments
+    // -------------------------------------------------------------------------
+    function comment() {
+        whitespace();
+
+        if (css[0] !== '/' || css[1] !== '*') { return; }
+
+        let i = 2;
+        while (css[i] && (css[i] !== '*' || css[i + 1] !== '/')) { i++; }
+
+        // FIXED
+        if (!css[i]) { return error('end of comment is missing'); }
+
+        const str = css.slice(2, i);
+        css = css.slice(i + 2);
+
+        return { type: 'comment', comment: str };
+    }
+    function comments() {
+        const cmnts = [];
+
+        let c;
+
+        while ((c = comment())) {
+            cmnts.push(c);
+        }
+        return cmnts;
+    }
+
+    // Selector
+    // -------------------------------------------------------------------------
+    function selector() {
+        whitespace();
+        while (css[0] === '}') {
+            error('extra closing bracket');
+        }
+
+        const m = match(/^(("(?:\\"|[^"])*"|'(?:\\'|[^'])*'|[^{])+)/);
+
+        if (m)
+        { return m[0]
+            .trim() // remove all comments from selectors
+            .replace(/\/\*([^*]|[\r\n]|(\*+([^*/]|[\r\n])))*\*\/+/g, '')
+            .replace(/"(?:\\"|[^"])*"|'(?:\\'|[^'])*'/g, function(m) {
+                return m.replace(/,/g, '\u200C');
+            })
+            .split(/\s*(?![^(]*\)),\s*/)
+            .map(function(s) {
+                return s.replace(/\u200C/g, ',');
+            }); }
+    }
+
+    // Declarations
+    // -------------------------------------------------------------------------
+    function declaration() {
+        match(/^([;\s]*)+/); // ignore empty declarations + whitespace
+
+        const comment_regexp = /\/\*[^*]*\*+([^/*][^*]*\*+)*\//g;
+
+        let prop = match(/^(\*?[-#/*\\\w]+(\[[0-9a-z_-]+\])?)\s*/);
+        if (!prop) { return; }
+
+        prop = prop[0].trim();
+
+        if (!match(/^:\s*/)) { return error('property missing \':\''); }
+
+        // Quotes regex repeats verbatim inside and outside parentheses
+        const val = match(/^((?:\/\*.*?\*\/|'(?:\\'|.)*?'|"(?:\\"|.)*?"|\((\s*'(?:\\'|.)*?'|"(?:\\"|.)*?"|[^)]*?)\s*\)|[^};])+)/);
+
+        const ret = { type: 'declaration', property: prop.replace(comment_regexp, ''), value: val ? val[0].replace(comment_regexp, '').trim() : '' };
+
+        match(/^[;\s]*/);
+
+        return ret;
+    }
+    function declarations() {
+        if (!open()) { return error('missing \'{\''); }
+
+        let d,
+            decls = comments();
+
+        while ((d = declaration())) {
+            decls.push(d);
+            decls = decls.concat(comments());
+        }
+
+        if (!close()) { return error('missing \'}\''); }
+
+        return decls;
+    }
+
+    // Keyframes
+    // -------------------------------------------------------------------------
+    function keyframe() {
+        whitespace();
+
+        const vals = [];
+
+        let m;
+
+        while ((m = match(/^((\d+\.\d+|\.\d+|\d+)%?|[a-z]+)\s*/))) {
+            vals.push(m[1]);
+            match(/^,\s*/);
+        }
+
+        if (vals.length) { return { type: 'keyframe', values: vals, declarations: declarations() }; }
+    }
+    function at_keyframes() {
+        let m = match(/^@([-\w]+)?keyframes\s*/);
+
+        if (!m) { return; }
+
+        const vendor = m[1];
+
+        m = match(/^([-\w]+)\s*/);
+        if (!m) { return error('@keyframes missing name'); } // identifier
+
+        const name = m[1];
+
+        if (!open()) { return error('@keyframes missing \'{\''); }
+
+        let frame,
+            frames = comments();
+        while ((frame = keyframe())) {
+            frames.push(frame);
+            frames = frames.concat(comments());
+        }
+
+        if (!close()) { return error('@keyframes missing \'}\''); }
+
+        return { type: 'keyframes', name: name, vendor: vendor, keyframes: frames };
+    }
+
+    // @ Rules
+    // -------------------------------------------------------------------------
+    function at_page() {
+        const m = match(/^@page */);
+        if (m) {
+            const sel = selector() || [];
+            return { type: 'page', selectors: sel, declarations: declarations() };
+        }
+    }
+    function at_fontface() {
+        const m = match(/^@font-face\s*/);
+        if (m) { return { type: 'font-face', declarations: declarations() }; }
+    }
+    function at_supports() {
+        const m = match(/^@supports *([^{]+)/);
+        if (m) { return { type: 'supports', supports: m[1].trim(), rules: rules() }; }
+    }
+    function at_host() {
+        const m = match(/^@host\s*/);
+        if (m) { return { type: 'host', rules: rules() }; }
+    }
+    function at_media() {
+        const m = match(/^@media *([^{]+)/);
+        if (m) { return { type: 'media', media: m[1].trim(), rules: rules() }; }
+    }
+    function at_custom_m() {
+        const m = match(/^@custom-media\s+(--[^\s]+)\s*([^{;]+);/);
+        if (m) { return { type: 'custom-media', name: m[1].trim(), media: m[2].trim() }; }
+    }
+    function at_document() {
+        const m = match(/^@([-\w]+)?document *([^{]+)/);
+        // FIXED
+        if (m) { return { type: 'document', document: m[2].trim(), vendor: m[1] ? m[1].trim() : null, rules: rules() }; }
+    }
+    function at_x() {
+        const m = match(/^@(import|charset|namespace)\s*([^;]+);/);
+        if (m) { return { type: m[1], name: m[2].trim() }; }
+    }
+    function at_rule() {
+        whitespace();
+        if (css[0] === '@') { return at_keyframes() || at_supports() || at_host() || at_media() || at_custom_m() || at_page() || at_document() || at_fontface() || at_x(); }
+    }
+
+    // Rules
+    // -------------------------------------------------------------------------
+    function rule() {
+        const sel = selector() || [];
+        if (!sel.length) { error('selector missing'); }
+
+        const decls = declarations();
+
+        return { type: 'rule', selectors: sel, declarations: decls };
+    }
+    function rules(core) {
+        if (!core && !open()) { return error('missing \'{\''); }
+
+        let node,
+            rules = comments();
+
+        while (css.length && (core || css[0] !== '}') && (node = at_rule() || rule())) {
+            rules.push(node);
+            rules = rules.concat(comments());
+        }
+
+        if (!core && !close()) { return error('missing \'}\''); }
+
+        return rules;
+    }
+
+    return { type: 'stylesheet', stylesheet: { rules: rules(true), errors: errors } };
+}
+
+
+// Exports
+// =============================================================================
+export default cssParse;
diff --git a/src/stringify-css.js b/src/stringify-css.js
new file mode 100644
index 0000000..abadffc
--- /dev/null
+++ b/src/stringify-css.js
@@ -0,0 +1,102 @@
+/**
+ * Based on css parser/compiler by NxChg
+ * https://github.com/NxtChg/pieces/tree/master/js/css_parser
+ */
+
+
+// Functions
+// =============================================================================
+/**
+ * Compiles CSS AST to string
+ *
+ * @param {object}   tree CSS AST object
+ * @param {string}   [delim=''] CSS rule delimiter
+ * @param {function} cb Function to be called before each node is processed
+ * @returns {string}
+ */
+function stringifyCss(tree, delim = '', cb) {
+    const renderMethods = {
+        charset(node) {
+            return '@charset ' + node.name + ';';
+        },
+        comment(node) {
+            return '';
+        },
+        'custom-media'(node) {
+            return '@custom-media ' + node.name + ' ' + node.media + ';';
+        },
+        declaration(node) {
+            return node.property + ':' + node.value + ';';
+        },
+        document(node) {
+            return '@' + (node.vendor || '') + 'document ' + node.document + '{' + visit(node.rules) + '}';
+        },
+        'font-face'(node) {
+            return '@font-face' + '{' + visit(node.declarations) + '}';
+        },
+        host(node) {
+            return '@host' + '{' + visit(node.rules) + '}';
+        },
+        import(node) {
+            // FIXED
+            return '@import ' + node.name + ';';
+        },
+        keyframe(node) {
+            return node.values.join(',') + '{' + visit(node.declarations) + '}';
+        },
+        keyframes(node) {
+            return '@' + (node.vendor || '') + 'keyframes ' + node.name + '{' + visit(node.keyframes) + '}';
+        },
+        media(node) {
+            return '@media ' + node.media + '{' + visit(node.rules) + '}';
+        },
+        namespace(node) {
+            return '@namespace ' + node.name + ';';
+        },
+        page(node) {
+            return '@page ' + (node.selectors.length ? node.selectors.join(', ') : '') + '{' + visit(node.declarations) + '}';
+        },
+        rule(node) {
+            const decls = node.declarations;
+
+            if (decls.length) {
+                return node.selectors.join(',') + '{' + visit(decls) + '}';
+            }
+        },
+        supports(node) {
+            // FIXED
+            return '@supports ' + node.supports + '{' + visit(node.rules) + '}';
+        }
+    };
+
+    function visit(nodes) {
+        let buf = '';
+
+        for (let i = 0; i < nodes.length; i++) {
+            const n = nodes[i];
+
+            if (cb) {
+                cb(n);
+            }
+
+            const txt = renderMethods[n.type](n);
+
+            if (txt) {
+                buf += txt;
+
+                if (txt.length && n.selectors) {
+                    buf += delim;
+                }
+            }
+        }
+
+        return buf;
+    }
+
+    return visit(tree.stylesheet.rules);
+}
+
+
+// Exports
+// =============================================================================
+export default stringifyCss;
diff --git a/src/transform-css.js b/src/transform-css.js
new file mode 100644
index 0000000..249079e
--- /dev/null
+++ b/src/transform-css.js
@@ -0,0 +1,314 @@
+/**
+ * Based on rework-vars by reworkcss
+ * https://github.com/reworkcss/rework-vars
+ */
+
+
+// Dependencies
+// =============================================================================
+import balanced     from 'balanced-match';
+import mergeDeep    from './merge-deep';
+import parseCss     from './parse-css';
+import stringifyCss from './stringify-css';
+
+
+// Constants & Variables
+// =============================================================================
+const VAR_PROP_IDENTIFIER = '--';
+const VAR_FUNC_IDENTIFIER = 'var';
+const reVarProp = /^--/;
+const reVarVal  = /^var(.*)/;
+
+
+// Functions
+// =============================================================================
+/**
+ * Transforms W3C-style CSS variables to static values and returns an updated
+ * CSS string.
+ *
+ * @param {object}   cssText CSS containing variable definitions and functions
+ * @param {object}   [options] Options object
+ * @param {boolean}  [options.onlyVars=true] Remove declarations that do not
+ *                   contain a CSS variable from the return value. Note that
+ *                   @font-face and @keyframe rules require all declarations to
+ *                   be returned if a CSS variable is used.
+ * @param {boolean}  [options.preserve=true] Preserve CSS variable definitions
+ *                   and functions in the return value, allowing "live" variable
+ *                   updates via JavaScript to continue working in browsers with
+ *                   native CSS variable support.
+ * @param {object}   [options.variables={}] CSS variable definitions to include
+ *                   during transformation. Can be used to add new override
+ *                   exisitng definitions.
+ * @param {function} [options.onWarning] Callback on each transformation
+ *                   warning. Passes 1) warningMessage as an argument.
+ * @returns {string}
+ */
+function transformVars(cssText, options = {}) {
+    const defaults = {
+        onlyVars : true,
+        preserve : true,
+        variables: {},
+        onWarning() {}
+    };
+    const map      = {};
+    const settings = mergeDeep(defaults, options);
+
+    // Convert cssText to AST (this could throw errors)
+    const cssTree = parseCss(cssText);
+
+    // Remove non-vars
+    if (settings.onlyVars) {
+        cssTree.stylesheet.rules = filterVars(cssTree.stylesheet.rules);
+    }
+
+    // Define variables
+    cssTree.stylesheet.rules.forEach(function(rule) {
+        const varNameIndices = [];
+
+        if (rule.type !== 'rule') {
+            return;
+        }
+
+        // only variables declared for `:root` are supported
+        if (rule.selectors.length !== 1 || rule.selectors[0] !== ':root') {
+            return;
+        }
+
+        rule.declarations.forEach(function(decl, i) {
+            const prop = decl.property;
+            const value = decl.value;
+
+            if (prop && prop.indexOf(VAR_PROP_IDENTIFIER) === 0) {
+                map[prop] = value;
+                varNameIndices.push(i);
+            }
+        });
+
+        // optionally remove `--*` properties from the rule
+        if (!settings.preserve) {
+            for (let i = varNameIndices.length - 1; i >= 0; i--) {
+                rule.declarations.splice(varNameIndices[i], 1);
+            }
+        }
+    });
+
+    // Handle variables defined in settings.variables
+    if (Object.keys(settings.variables).length) {
+        const newRule = {
+            declarations: [],
+            selectors   : [':root'],
+            type        : 'rule'
+        };
+
+        Object.keys(settings.variables).forEach(function(key) {
+            // Normalize variables by ensuring all start with leading '--'
+            const varName  = `--${key.replace(/^-+/, '')}`;
+            const varValue = settings.variables[key];
+
+            // Update internal map value with settings.variables value
+            map[varName] = varValue;
+
+            // Add new declaration to newRule
+            newRule.declarations.push({
+                type    : 'declaration',
+                property: varName,
+                value   : varValue
+            });
+        });
+
+        // Append new :root ruleset
+        if (settings.preserve) {
+            cssTree.stylesheet.rules.push(newRule);
+        }
+    }
+
+    // Resolve variables
+    walkCss(cssTree.stylesheet, function(declarations, node) {
+        let decl;
+        let resolvedValue;
+        let value;
+
+        for (let i = 0; i < declarations.length; i++) {
+            decl = declarations[i];
+            value = decl.value;
+
+            // skip comments
+            if (decl.type !== 'declaration') {
+                continue;
+            }
+
+            // skip values that don't contain variable functions
+            if (!value || value.indexOf(VAR_FUNC_IDENTIFIER + '(') === -1) {
+                continue;
+            }
+
+            resolvedValue = resolveValue(value, map, settings);
+
+            if (resolvedValue !== 'undefined') {
+                if (!settings.preserve) {
+                    decl.value = resolvedValue;
+                }
+                else {
+                    declarations.splice(i, 0, {
+                        type    : decl.type,
+                        property: decl.property,
+                        value   : resolvedValue
+                    });
+
+                    // skip ahead of preserved declaration
+                    i++;
+                }
+            }
+        }
+    });
+
+    // Return CSS string
+    return stringifyCss(cssTree);
+}
+
+
+// Functions (Private)
+// =============================================================================
+/**
+ * Filters rules recursively, retaining only declarations that contain either a
+ * CSS variable definition (property) or function (value). Maintains all
+ * declarations for @font-face and @keyframes rules that contain a CSS
+ * definition or function.
+ *
+ * @param {array} rules
+ * @returns {array}
+ */
+function filterVars(rules) {
+    return rules.filter(rule => {
+        // Rule, @font-face, @host, @page
+        if (rule.declarations) {
+            // @font-face rules require all declarations to be retained if any
+            // declaration contains a CSS variable definition or value.
+            // For other rules, any declaration that does not contain a CSS
+            // variable can be removed.
+            let declArray = rule.type === 'font-face' ? [] : rule.declarations;
+
+            declArray = rule.declarations.filter(d => reVarProp.test(d.property) || reVarVal.test(d.value));
+
+            return Boolean(declArray.length);
+        }
+        // @keyframes
+        else if (rule.keyframes) {
+            // @keyframe rules require all declarations to be retained if any
+            // declaration contains a CSS variable definition or value.
+            return Boolean(rule.keyframes.filter(k =>
+                Boolean(k.declarations.filter(d => reVarProp.test(d.property) || reVarVal.test(d.value)).length)
+            ).length);
+        }
+        // @document, @media, @supports
+        else if (rule.rules) {
+            rule.rules = filterVars(rule.rules).filter(r => r.declarations.length);
+
+            return Boolean(rule.rules.length);
+        }
+
+        return true;
+    });
+}
+
+/**
+ * Resolve CSS variables in a value
+ *
+ * The second argument to a CSS variable function, if provided, is a fallback
+ * value, which is used as the substitution value when the referenced variable
+ * is invalid.
+ *
+ * var(name[, fallback])
+ *
+ * @param {string} value A property value containing a CSS variable function
+ * @param {object} map A map of variable names and values
+ * @param {object} settings Settings object passed from transformVars()
+ * @return {string} A new value with CSS variables substituted or using fallback
+ */
+function resolveValue(value, map, settings) {
+    // matches `name[, fallback]`, captures 'name' and 'fallback'
+    const RE_VAR = /([\w-]+)(?:\s*,\s*)?(.*)?/;
+    const balancedParens = balanced('(', ')', value);
+    const varStartIndex  = value.indexOf('var(');
+    const varRef         = balanced('(', ')', value.substring(varStartIndex)).body;
+    const warningIntro   = 'CSS transform warning:';
+
+    /* istanbul ignore next */
+    if (!balancedParens) {
+        settings.onWarning(`${warningIntro} missing closing ")" in the value "${value}"`);
+    }
+
+    /* istanbul ignore next */
+    if (varRef === '') {
+        settings.onWarning(`${warningIntro} var() must contain a non-whitespace string`);
+    }
+
+    const varFunc = VAR_FUNC_IDENTIFIER + '(' + varRef + ')';
+
+    const varResult = varRef.replace(RE_VAR, function(_, name, fallback) {
+        const replacement = map[name];
+
+        if (!replacement && !fallback) {
+            settings.onWarning(`${warningIntro} variable "${name}" is undefined`);
+        }
+
+        if (!replacement && fallback) {
+            return fallback;
+        }
+
+        return replacement;
+    });
+
+    // resolve the variable
+    value = value.split(varFunc).join(varResult);
+
+    // recursively resolve any remaining variables in the value
+    if (value.indexOf(VAR_FUNC_IDENTIFIER) !== -1) {
+        value = resolveValue(value, map, settings);
+    }
+
+    return value;
+}
+
+/**
+ * Visit `node` declarations recursively and invoke `fn(declarations, node)`.
+ *
+ * Based on rework-visit by reworkcss
+ * https://github.com/reworkcss/rework-visit
+ *
+ * @param {object} node
+ * @param {function} fn
+ */
+function walkCss(node, fn){
+    node.rules.forEach(function(rule){
+        // @media etc
+        if (rule.rules) {
+            walkCss(rule, fn);
+
+            return;
+        }
+
+        // keyframes
+        if (rule.keyframes) {
+            rule.keyframes.forEach(function(keyframe){
+                if (keyframe.type === 'keyframe') {
+                    fn(keyframe.declarations, rule);
+                }
+            });
+
+            return;
+        }
+
+        // @charset, @import etc
+        if (!rule.declarations) {
+            return;
+        }
+
+        fn(rule.declarations, node);
+    });
+}
+
+
+// Exports
+// =============================================================================
+export default transformVars;
diff --git a/tests/.eslintrc.js b/tests/.eslintrc.js
new file mode 100644
index 0000000..2fd6771
--- /dev/null
+++ b/tests/.eslintrc.js
@@ -0,0 +1,20 @@
+// Cascading config (merges with parent config)
+// http://eslint.org/docs/user-guide/configuring#configuration-cascading-and-hierarchy
+module.exports = {
+    "env": {
+        "mocha": true
+    },
+    "plugins": [
+        "chai-expect",
+        "mocha"
+    ],
+    "parserOptions": {
+        "ecmaVersion": 8,
+    },
+    "rules": {
+        "mocha/no-global-tests"   : ["error"],
+        "mocha/no-identical-title": ["error"],
+        "mocha/no-mocha-arrows"   : ["error"],
+        "no-console"              : "off",
+    }
+};
diff --git a/tests/css-vars.test.js b/tests/css-vars.test.js
new file mode 100644
index 0000000..3e320b7
--- /dev/null
+++ b/tests/css-vars.test.js
@@ -0,0 +1,454 @@
+// Dependencies
+// =============================================================================
+import createElms from 'create-elms';
+import cssVars    from '../src/index';
+import { expect } from 'chai';
+
+
+// Constants & Variables
+// =============================================================================
+const hasNativeSupport = window.CSS && window.CSS.supports && window.CSS.supports('(--a: 0)');
+
+
+// Helpers
+// =============================================================================
+function createElmsWrap(elmData, sharedOptions = {}) {
+    sharedOptions = Object.assign({}, {
+        attr    : Object.assign({ 'data-test': true }, sharedOptions.attr || {}),
+        appendTo: 'head'
+    }, sharedOptions);
+
+    return createElms(elmData, sharedOptions);
+}
+
+
+// Suite
+// =============================================================================
+describe('css-vars', function() {
+    // Hooks
+    // -------------------------------------------------------------------------
+    // Remove <link> and <style> elements added for each test
+    beforeEach(function() {
+        const testNodes = document.querySelectorAll('[data-test]');
+
+        for (let i = 0; i < testNodes.length; i++) {
+            testNodes[i].parentNode.removeChild(testNodes[i]);
+        }
+    });
+
+    // Tests: Stylesheets
+    // -------------------------------------------------------------------------
+    describe('Stylesheets', function() {
+        it('handles <style> elements', function() {
+            const styleCss  = `
+                :root { --color: red; }
+                p { color: var(--color); }
+            `;
+            const expectCss = 'p{color:red;}';
+
+            createElmsWrap({ tag: 'style', text: styleCss });
+
+            cssVars({
+                include   : '[data-test]',
+                onlyLegacy: false,
+                preserve  : false,
+                onComplete(cssText, styleNode) {
+                    expect(cssText).to.equal(expectCss);
+                }
+            });
+        });
+
+        it('handles <link> elements', function(done) {
+            const linkUrl1  = location.origin + '/base/tests/fixtures/test-declaration.css';
+            const linkUrl2  = location.origin + '/base/tests/fixtures/test-value.css';
+            const expectCss = 'p{color:red;}';
+
+            createElmsWrap([
+                { tag: 'link', attr: { rel: 'stylesheet', href: linkUrl1 } },
+                { tag: 'link', attr: { rel: 'stylesheet', href: linkUrl2 } }
+            ]);
+
+            cssVars({
+                include   : '[data-test]',
+                onlyLegacy: false,
+                preserve  : false,
+                onComplete(cssText, styleNode) {
+                    expect(cssText).to.equal(expectCss);
+                    done();
+                }
+            });
+        });
+
+        it('handles <link> and <style> elements', function(done) {
+            const linkUrl1  = location.origin + '/base/tests/fixtures/test-declaration.css';
+            const linkUrl2  = location.origin + '/base/tests/fixtures/test-value.css';
+            const styleCss  = `
+                @import url("${linkUrl2}");
+                @import url("${linkUrl1}");
+                p { color: var(--color); }
+            `;
+            const expectCss = 'p{color:red;}p{color:red;}p{color:red;}';
+
+            createElmsWrap([
+                { tag: 'link', attr: { rel: 'stylesheet', href: linkUrl1 } },
+                { tag: 'link', attr: { rel: 'stylesheet', href: linkUrl2 } },
+                { tag: 'style', text: styleCss }
+            ]);
+
+            cssVars({
+                include   : '[data-test]',
+                onlyLegacy: false,
+                preserve  : false,
+                onComplete(cssText, styleNode) {
+                    expect(cssText).to.equal(expectCss);
+                    done();
+                }
+            });
+        });
+    });
+
+    // Tests: Options
+    // -------------------------------------------------------------------------
+    describe('Options', function() {
+        describe('appendStyle', function() {
+            it('true (appends to <head>)', function() {
+                const elm = createElmsWrap({
+                    tag     : 'style',
+                    text    : ':root{--color:red;}p{color:var(--color);}',
+                    appendTo: 'head'
+                })[0];
+
+                cssVars({
+                    include    : '[data-test]',
+                    appendStyle: true,
+                    onlyLegacy : false,
+                    onComplete(cssText, styleNode) {
+                        expect(styleNode.parentNode).to.equal(elm.parentNode);
+                    }
+                });
+            });
+
+            it('true (appends to <body>)', function() {
+                const elm = createElmsWrap({
+                    tag     : 'style',
+                    text    : ':root{--color:red;}p{color:var(--color);}',
+                    appendTo: 'body'
+                })[0];
+
+                cssVars({
+                    include    : '[data-test]',
+                    appendStyle: true,
+                    onlyLegacy : false,
+                    onComplete(cssText, styleNode) {
+                        expect(styleNode.parentNode).to.equal(elm.parentNode);
+                    }
+                });
+            });
+
+            it('false (does not append <style>)', function() {
+                createElmsWrap({
+                    tag     : 'style',
+                    text    : ':root{--color:red;}p{color:var(--color);}',
+                    appendTo: 'head'
+                });
+
+                cssVars({
+                    include    : '[data-test]',
+                    appendStyle: false,
+                    onlyLegacy : false,
+                    onComplete(cssText, styleNode) {
+                        expect(styleNode).to.equal(null);
+                    }
+                });
+            });
+        });
+
+        describe('onlyLegacy', function() {
+            it('true', function() {
+                const styleCss  = ':root{--color:red;}p{color:var(--color);}';
+                const expectCss = hasNativeSupport ? '' : 'p{color:red;}';
+
+                createElmsWrap({ tag: 'style', text: styleCss });
+
+                cssVars({
+                    include   : '[data-test]',
+                    onlyLegacy: true,
+                    preserve  : false,
+                    onComplete(cssText, styleNode) {
+                        expect(cssText).to.equal(expectCss);
+                    }
+                });
+            });
+        });
+
+        // The 'onlyVars' option is used in this module as well as the
+        // transfrom-css.js module. Testing how this options is handled by each
+        // module is handled in each module's test file.
+        describe('onlyVars', function() {
+            it('true - filters CSS data', function() {
+                const expectCss = 'p{color:red;}';
+
+                createElmsWrap([
+                    { tag: 'style', text: ':root { --color: red; }' },
+                    { tag: 'style', text: 'p { color: var(--color); }' },
+                    { tag: 'style', text: 'p { color: green; }' }
+                ]);
+
+                cssVars({
+                    include   : '[data-test]',
+                    onlyLegacy: false,
+                    preserve  : false,
+                    onComplete(cssText, styleNode) {
+                        expect(cssText).to.equal(expectCss);
+                    }
+                });
+            });
+
+            it('true - filters CSS declarations (passed to transform-css)', function() {
+                const styleCss = `
+                    :root {--color: red;}
+                    p { color: var(--color); }
+                    p { color: green; }
+                `;
+                const expectCss = 'p{color:red;}';
+
+                createElmsWrap({ tag: 'style', text: styleCss });
+
+                cssVars({
+                    include   : '[data-test]',
+                    onlyLegacy: false,
+                    preserve  : false,
+                    onComplete(cssText, styleNode) {
+                        expect(cssText).to.equal(expectCss);
+                    }
+                });
+            });
+        });
+
+        describe('preserve', function() {
+            it('true (passed to transform-css)', function() {
+                const styleCss  = ':root{--color:red;}p{color:var(--color);}';
+                const expectCss = ':root{--color:red;}p{color:red;color:var(--color);}';
+
+                createElmsWrap({ tag: 'style', text: styleCss });
+
+                cssVars({
+                    include   : '[data-test]',
+                    onlyLegacy: false,
+                    preserve  : true,
+                    onComplete(cssText, styleNode) {
+                        expect(cssText).to.equal(expectCss);
+                    }
+                });
+            });
+
+            it('false (passed to transform-css)', function() {
+                const styleCss  = ':root{--color:red;}p{color:var(--color);}';
+                const expectCss = 'p{color:red;}';
+
+                createElmsWrap({ tag: 'style', text: styleCss });
+
+                cssVars({
+                    include   : '[data-test]',
+                    onlyLegacy: false,
+                    preserve  : false,
+                    onComplete(cssText, styleNode) {
+                        expect(cssText).to.equal(expectCss);
+                    }
+                });
+            });
+        });
+
+        describe('variables', function() {
+            it('passed to transform-css', function() {
+                const styleCss  = `
+                    :root{ --color1: black; }
+                    p { color: var(--color1); }
+                    p { color: var(--color2); }
+                    p { color: var(--color3); }
+                    p { color: var(--color4); }
+                `;
+                const expectCss = 'p{color:red;}p{color:green;}p{color:blue;}p{color:purple;}';
+
+                createElmsWrap({ tag: 'style', text: styleCss });
+
+                cssVars({
+                    include   : '[data-test]',
+                    onlyLegacy: false,
+                    preserve  : false,
+                    variables : {
+                        color2    : 'green',  // No leading --
+                        '-color3' : 'blue',   // Malformed
+                        '--color4': 'purple', // Leading --
+                        '--color1': 'red'     // Override
+                    },
+                    onComplete(cssText, styleNode) {
+                        expect(cssText).to.equal(expectCss);
+                    }
+                });
+            });
+        });
+    });
+
+    // Tests: Callbacks
+    // -------------------------------------------------------------------------
+    describe('Callbacks', function() {
+        it('triggers onError callback with proper arguments', function(done) {
+            const linkUrl  = location.origin + '/base/tests/fixtures/test-onerror.css';
+            const styleCss = ':root { --error: red;';
+            const elms     = createElmsWrap([
+                { tag: 'link', attr: { rel: 'stylesheet', href: 'fail.css' } },
+                { tag: 'link', attr: { rel: 'stylesheet', href: linkUrl } },
+                { tag: 'style', text: styleCss }
+            ]);
+
+            let   onErrorCount = 0;
+            let   onErrorMsg;
+            const onErrorNodes = [];
+
+            cssVars({
+                include   : '[data-test]',
+                onlyLegacy: false,
+                silent    : true, // remove to display console error messages
+                onError(errorMsg, node) {
+                    onErrorCount++;
+                    onErrorMsg = errorMsg;
+                    onErrorNodes.push(node);
+                },
+                onComplete(cssText, styleNode) {
+                    expect(onErrorCount, 'onError count').to.equal(elms.length);
+                    expect(onErrorMsg.toLowerCase().indexOf('error') > -1, 'onError message').to.be.true;
+                    expect(onErrorNodes, 'onError nodes').to.include.members(elms);
+                    done();
+                }
+            });
+        });
+
+        it('triggers onSuccess callback with proper arguments', function(done) {
+            const styleCss  = ':root { --color: red; } p { color: var(--color); }';
+            const expectCss = ':root{--color:red;}p{color:red;color:var(--color);}';
+
+            let onSuccessCssText;
+
+            createElmsWrap({ tag: 'style', text: styleCss });
+
+            cssVars({
+                include   : '[data-test]',
+                onlyLegacy: false,
+                onSuccess(cssText) {
+                    onSuccessCssText = cssText;
+                },
+                onComplete(cssText, styleNode) {
+                    expect(onSuccessCssText).to.equal(expectCss);
+                    done();
+                }
+            });
+        });
+
+        it('triggers onWarning callback with proper arguments', function(done) {
+            const styleElms = createElmsWrap([
+                { tag: 'style', text: 'p { color: var(--fail); }' }
+            ]);
+
+            let onWarningCount = 0;
+            let onWarningMsg;
+
+            cssVars({
+                include   : '[data-test]',
+                onlyLegacy: false,
+                silent    : true, // remove to display console error messages
+                onWarning(warningMsg) {
+                    onWarningCount++;
+                    onWarningMsg = warningMsg;
+                },
+                onComplete(cssText, styleNode) {
+                    expect(onWarningCount, 'onWarning count').to.equal(styleElms.length);
+                    expect(onWarningMsg.toLowerCase().indexOf('warning') > -1, 'onWarning message').to.be.true;
+                    done();
+                }
+            });
+        });
+
+        it('triggers onComplete callback with proper arguments', function(done) {
+            const styleCss  = ':root { --color: red; } p { color: var(--color); }';
+            const expectCss = ':root{--color:red;}p{color:red;color:var(--color);}';
+
+            createElmsWrap({ tag: 'style', text: styleCss });
+
+            cssVars({
+                include   : '[data-test]',
+                onlyLegacy: false,
+                onComplete(cssText, styleNode) {
+                    expect(cssText).to.equal(expectCss);
+                    done();
+                }
+            });
+        });
+    });
+
+    // Tests: Updates
+    // -------------------------------------------------------------------------
+    describe('Updates', function() {
+        it('updates properly when called multiple times', function() {
+            const expectCss = [
+                'p{color:red;}',
+                'p{color:green;}',
+                'p{color:green;}div{color:green;}',
+                'p{color:blue;}div{color:blue;}',
+            ];
+
+            createElmsWrap({ tag: 'style', text: ':root { --color: red; } p { color: var(--color); }' });
+
+            cssVars({
+                include   : '[data-test]',
+                onlyLegacy: false,
+                preserve  : false,
+                onComplete(cssText, styleNode) {
+                    const styleNameParentTag = styleNode.parentNode.tagName.toLowerCase();
+
+                    expect(styleNameParentTag, 'appended to <head>').to.equal('head');
+                    expect(cssText).to.equal(expectCss[0]);
+                }
+            });
+
+            createElmsWrap({ tag: 'style', text: ':root { --color: green; }' });
+
+            cssVars({
+                include   : '[data-test]',
+                onlyLegacy: false,
+                preserve  : false,
+                onComplete(cssText, styleNode) {
+                    const styleElms    = document.querySelectorAll('head style');
+                    const lastStyleElm = styleElms[styleElms.length - 1];
+
+                    expect(styleNode, 'appended again to make last <style> node').to.equal(lastStyleElm);
+                    expect(cssText).to.equal(expectCss[1]);
+                }
+            });
+
+            createElmsWrap({ tag: 'style', text: 'div { color: var(--color); }', appendTo: 'body' });
+
+            cssVars({
+                include   : '[data-test]',
+                onlyLegacy: false,
+                preserve  : false,
+                onComplete(cssText, styleNode) {
+                    const styleNameParentTag = styleNode.parentNode.tagName.toLowerCase();
+
+                    expect(styleNameParentTag, 'appended to <body>').to.equal('body');
+                    expect(cssText).to.equal(expectCss[2]);
+                }
+            });
+
+            cssVars({
+                exclude   : ':not([data-test])',
+                onlyLegacy: false,
+                preserve  : false,
+                variables : { color: 'blue' },
+                onComplete(cssText, styleNode) {
+                    expect(cssText).to.equal(expectCss[3]);
+                }
+            });
+        });
+    });
+});
diff --git a/tests/fixtures/test-declaration.css b/tests/fixtures/test-declaration.css
new file mode 100644
index 0000000..6158f03
--- /dev/null
+++ b/tests/fixtures/test-declaration.css
@@ -0,0 +1,3 @@
+:root {
+    --color: red;
+}
\ No newline at end of file
diff --git a/tests/fixtures/test-onerror.css b/tests/fixtures/test-onerror.css
new file mode 100644
index 0000000..0cda58a
--- /dev/null
+++ b/tests/fixtures/test-onerror.css
@@ -0,0 +1 @@
+:root { --error: red;
\ No newline at end of file
diff --git a/tests/fixtures/test-parse.css b/tests/fixtures/test-parse.css
new file mode 100644
index 0000000..9511305
--- /dev/null
+++ b/tests/fixtures/test-parse.css
@@ -0,0 +1,210 @@
+/* spacing */
+a{height:0}
+a{height:0;}
+a { height: 0; }
+a   {   height  : 0 ;   }
+a {
+    height : 0;
+}
+a
+{
+height
+:
+0
+;
+}
+
+/* selectors */
+a,b,c{height:0;}
+a, b, c { height: 0; }
+a, b,
+c
+{ height: 0; }
+
+/* quotes */
+a {
+    background: url('path;to;file?a=1&b=2') 50% 50% no-repeat;
+}
+a {
+    background: url("path;to;file?a=1&b=2") 50% 50% no-repeat;
+}
+
+/* comma-separated */
+a[bar="foo,bar"] {
+    height: 0;
+}
+a:first-child(.foo,.bar) {
+    height: 0;
+}
+
+/* comments */
+a {
+    margin/*123*/: 1px/*\**/ 2px /*45*/3px\9;
+}
+
+/* variables */
+:root { --color: red; }
+a { color: var(--color); }
+
+/* misc */
+foo bar baz {
+    bizz-buzz: word "ferrets";
+    *even: 'ie boo'
+}
+.wtf {
+    *overflow-x: hidden;
+    //max-height: 110px;
+    #height: 18px;
+}
+
+/* @charset */
+@charset "UTF-8";
+
+/* @custom-media */
+@custom-media
+    --test
+    (max-width: 1024px)
+;
+@custom-media --narrow-window (max-width: 1024px);
+@custom-media --wide-window screen and (max-width: 1024px);
+
+/* @document */
+@document url-prefix() {
+    .test {
+        height: 0;
+    }
+}
+@-moz-document url-prefix() {
+    .test1 {
+        height: 0
+    }
+
+    .test2 {
+        height: 0;
+    }
+}
+
+/* @font-face */
+@font-face {
+    font-family: "Bitstream Vera Serif Bold";
+    src: url("http://developer.mozilla.org/@api/deki/files/2934/=VeraSeBd.ttf");
+}
+
+/* @host */
+@host {
+    :scope { height: 0; }
+}
+
+/* @import */
+@import 'test.css';
+@import "test.css" screen, projection;
+@import url('test.css');
+@import url("test.css") print;
+@import url("test.css") projection, tv;
+@import url('test.css') screen and (orientation:landscape);
+
+/* @keyframes */
+@keyframes test1 {
+    from { opacity: 0 }
+    to { opacity: 1; }
+}
+@-webkit-keyframes test2 {
+    from { opacity: 0 }
+    to { opacity: 1; }
+}
+@keyframes test3 {
+    0% { opacity: 0 }
+    30.50% { opacity: 0.3050 }
+    .68% ,
+    72%
+        , 85% { opacity: 0.85 }
+    100% { opacity: 1 }
+}
+
+/* @media */
+@media (min-width: 1024px) {
+    .test { height: 0; }
+}
+@media screen, print {
+    .test { height: 0; }
+}
+
+/* @namespace */
+@namespace svg "http://www.w3.org/2000/svg";
+@namespace
+    "http://www.w3.org/1999/xhtml"
+    ;
+
+/* @page */
+@page {
+    margin: 1cm;
+}
+@page :first {
+    margin: 1cm;
+}
+@page toc, index:blank {
+    margin: 1cm;
+}
+@page
+    toc
+    ,
+    index:blank
+    {
+        margin: 1cm
+    }
+
+/* @supports */
+@supports (display: flex) {
+    a {
+        height: 0;
+    }
+}
+@supports (display: flex) or (display: box) {
+    a {
+        height: 0;
+    }
+}
+
+/* Escaped: Will be remove */
+.\3A \`\({}
+.\3A \`\({}
+.\31 a2b3c{}
+#\#fake-id{}
+#\---{}
+#-a-b-c-{}
+#©{}
+
+/* Escaped: Retained (http://mathiasbynens.be/demo/html5-id) */
+a[bcd="e\",f"] { height: 0; }
+#♥{height:0;}
+#©{height:0;}
+#“‘’”{height:0;}
+#☺☃{height:0;}
+#⌘⌥{height:0;}
+#𝄞♪♩♫♬{height:0;}
+#\?{height:0;}
+#\@{height:0;}
+#\.{height:0;}
+#\3A \){height:0;}
+#\3A \`\({height:0;}
+#\31 23{height:0;}
+#\31 a2b3c{height:0;}
+#\<p\>{height:0;}
+#\<\>\<\<\<\>\>\<\>{height:0;}
+#\+\+\+\+\+\+\+\+\+\+\[\>\+\+\+\+\+\+\+\>\+\+\+\+\+\+\+\+\+\+\>\+\+\+\>\+\<\<\<\<\-\]\>\+\+\.\>\+\.\+\+\+\+\+\+\+\.\.\+\+\+\.\>\+\+\.\<\<\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\.\>\.\+\+\+\.\-\-\-\-\-\-\.\-\-\-\-\-\-\-\-\.\>\+\.\>\.{height:0;}
+#\#{height:0;}
+#\#\#{height:0;}
+#\#\.\#\.\#{height:0;}
+#\_{height:0;}
+#\.fake\-class{height:0;}
+#foo\.bar{height:0;}
+#\3A hover{height:0;}
+#\3A hover\3A focus\3A active{height:0;}
+#\[attr\=value\]{height:0;}
+#f\/o\/o{height:0;}
+#f\\o\\o{height:0;}
+#f\*o\*o{height:0;}
+#f\!o\!o{height:0;}
+#f\'o\'o{height:0;}
+#f\~o\~o{height:0;}
+#f\+o\+o{height:0;}
\ No newline at end of file
diff --git a/tests/fixtures/test-stringify.css b/tests/fixtures/test-stringify.css
new file mode 100644
index 0000000..62da276
--- /dev/null
+++ b/tests/fixtures/test-stringify.css
@@ -0,0 +1,96 @@
+a{height:0;}
+a{height:0;}
+a{height:0;}
+a{height:0;}
+a{height:0;}
+a{height:0;}
+
+a,b,c{height:0;}
+a,b,c{height:0;}
+a,b,c{height:0;}
+
+a{background:url('path;to;file?a=1&b=2') 50% 50% no-repeat;}
+a{background:url("path;to;file?a=1&b=2") 50% 50% no-repeat;}
+
+a[bar="foo,bar"]{height:0;}
+a:first-child(.foo,.bar){height:0;}
+
+a{margin:1px 2px 3px\9;}
+
+:root{--color:red;}
+a{color:var(--color);}
+
+foo bar baz{bizz-buzz:word "ferrets";*even:'ie boo';}
+.wtf{*overflow-x:hidden;//max-height:110px;#height:18px;}
+
+@charset "UTF-8";
+
+@custom-media --test (max-width: 1024px);
+@custom-media --narrow-window (max-width: 1024px);
+@custom-media --wide-window screen and (max-width: 1024px);
+
+@document url-prefix(){.test{height:0;}}
+@-moz-document url-prefix(){.test1{height:0;}.test2{height:0;}}
+
+@font-face{font-family:"Bitstream Vera Serif Bold";src:url("http://developer.mozilla.org/@api/deki/files/2934/=VeraSeBd.ttf");}
+
+@host{:scope{height:0;}}
+
+@import 'test.css';
+@import "test.css" screen, projection;
+@import url('test.css');
+@import url("test.css") print;
+@import url("test.css") projection, tv;
+@import url('test.css') screen and (orientation:landscape);
+
+@keyframes test1{from{opacity:0;}to{opacity:1;}}
+@-webkit-keyframes test2{from{opacity:0;}to{opacity:1;}}
+@keyframes test3{0%{opacity:0;}30.50%{opacity:0.3050;}.68%,72%,85%{opacity:0.85;}100%{opacity:1;}}
+
+@media (min-width: 1024px){.test{height:0;}}
+@media screen, print{.test{height:0;}}
+
+@namespace svg "http://www.w3.org/2000/svg";
+@namespace "http://www.w3.org/1999/xhtml";
+
+@page {margin:1cm;}
+@page :first{margin:1cm;}
+@page toc, index:blank{margin:1cm;}
+@page toc, index:blank{margin:1cm;}
+
+@supports (display: flex){a{height:0;}}
+@supports (display: flex) or (display: box){a{height:0;}}
+
+a[bcd="e\",f"]{height:0;}
+#♥{height:0;}
+#©{height:0;}
+#“‘’”{height:0;}
+#☺☃{height:0;}
+#⌘⌥{height:0;}
+#𝄞♪♩♫♬{height:0;}
+#\?{height:0;}
+#\@{height:0;}
+#\.{height:0;}
+#\3A \){height:0;}
+#\3A \`\({height:0;}
+#\31 23{height:0;}
+#\31 a2b3c{height:0;}
+#\<p\>{height:0;}
+#\<\>\<\<\<\>\>\<\>{height:0;}
+#\+\+\+\+\+\+\+\+\+\+\[\>\+\+\+\+\+\+\+\>\+\+\+\+\+\+\+\+\+\+\>\+\+\+\>\+\<\<\<\<\-\]\>\+\+\.\>\+\.\+\+\+\+\+\+\+\.\.\+\+\+\.\>\+\+\.\<\<\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\.\>\.\+\+\+\.\-\-\-\-\-\-\.\-\-\-\-\-\-\-\-\.\>\+\.\>\.{height:0;}
+#\#{height:0;}
+#\#\#{height:0;}
+#\#\.\#\.\#{height:0;}
+#\_{height:0;}
+#\.fake\-class{height:0;}
+#foo\.bar{height:0;}
+#\3A hover{height:0;}
+#\3A hover\3A focus\3A active{height:0;}
+#\[attr\=value\]{height:0;}
+#f\/o\/o{height:0;}
+#f\\o\\o{height:0;}
+#f\*o\*o{height:0;}
+#f\!o\!o{height:0;}
+#f\'o\'o{height:0;}
+#f\~o\~o{height:0;}
+#f\+o\+o{height:0;}
\ No newline at end of file
diff --git a/tests/fixtures/test-value.css b/tests/fixtures/test-value.css
new file mode 100644
index 0000000..759308b
--- /dev/null
+++ b/tests/fixtures/test-value.css
@@ -0,0 +1,3 @@
+p {
+    color: var(--color);
+}
\ No newline at end of file
diff --git a/tests/helpers/load-fixtures.js b/tests/helpers/load-fixtures.js
new file mode 100644
index 0000000..aab22cb
--- /dev/null
+++ b/tests/helpers/load-fixtures.js
@@ -0,0 +1,34 @@
+// Dependencies
+// =============================================================================
+import axios from 'axios';
+
+
+// Functions
+// =============================================================================
+function loadFixtures(options = {}, targetObj = {}) {
+    const baseUrl = options.base || '';
+    const urls    = Array.isArray(options.urls) ? options.urls : options.urls ? [options.urls] : [];
+
+    return new Promise(function(resolve, reject) {
+        // Load Fixtures
+        axios.all(urls.map(url => axios.get(`${baseUrl}${url}`)))
+            .then(axios.spread(function (...responseArr) {
+                responseArr.forEach((response, i) => {
+                    const key = urls[i];
+                    const val = response.data;
+
+                    targetObj[key] = val;
+                });
+
+                resolve(targetObj);
+            }))
+            .catch(err => {
+                reject(err);
+            });
+    });
+}
+
+
+// Export
+// =============================================================================
+export default loadFixtures;
diff --git a/tests/parse-css.test.js b/tests/parse-css.test.js
new file mode 100644
index 0000000..5e4055c
--- /dev/null
+++ b/tests/parse-css.test.js
@@ -0,0 +1,130 @@
+// Dependencies
+// =============================================================================
+import loadFixtures from './helpers/load-fixtures';
+import parseCss     from '../src/parse-css';
+import { expect }   from 'chai';
+
+
+// Suite
+// =============================================================================
+describe('parse-css', function() {
+    const fixtures = {};
+
+    // Hooks
+    // -------------------------------------------------------------------------
+    before(async function() {
+        await loadFixtures({
+            base: '/base/tests/fixtures/',
+            urls : ['test-parse.css'],
+        }, fixtures);
+    });
+
+    // Tests
+    // -------------------------------------------------------------------------
+    it('parses CSS to an AST (object)', async function() {
+        const css = fixtures['test-parse.css'];
+        const ast = parseCss(css);
+
+        expect(ast).to.be.an('object');
+        expect(ast).to.have.property('type', 'stylesheet');
+    });
+
+    it('throws an error when parsing missing opening bracket', function() {
+        const css = 'p color: red; }';
+        const badFn = function() {
+            parseCss(css);
+        };
+
+        expect(badFn).to.throw(Error, 'missing \'{\'');
+    });
+
+    it('throws an error when parsing missing @rule opening bracket', function() {
+        const css = '@media screen p color: red; }';
+        const badFn = function() {
+            parseCss(css);
+        };
+
+        expect(badFn).to.throw(Error, 'missing \'{\'');
+    });
+
+    it('throws an error when parsing missing closing bracket', function() {
+        const css = 'p { color: red;';
+        const badFn = function() {
+            parseCss(css);
+        };
+
+        expect(badFn).to.throw(Error, 'missing \'}\'');
+    });
+
+    it('throws an error when parsing missing @rule closing bracket', function() {
+        const css = '@media screen { p { color: red; }';
+        const badFn = function() {
+            parseCss(css);
+        };
+
+        expect(badFn).to.throw(Error, 'missing \'}\'');
+    });
+
+    it('throws an error when parsing missing end of comment', function() {
+        const css = '/* Comment *';
+        const badFn = function() {
+            parseCss(css);
+        };
+
+        expect(badFn).to.throw(Error, 'end of comment');
+    });
+
+    it('throws an error when parsing extra closing bracket', function() {
+        const css = 'p { color: red; }}';
+        const badFn = function() {
+            parseCss(css);
+        };
+
+        expect(badFn).to.throw(Error, 'closing bracket');
+    });
+
+    it('throws an error when parsing property missing colon', function() {
+        const css = 'p { color red; }';
+        const badFn = function() {
+            parseCss(css);
+        };
+
+        expect(badFn).to.throw(Error, 'property missing \':\'');
+    });
+
+    it('throws an error when parsing missing selector', function() {
+        const css = '{ color red; }';
+        const badFn = function() {
+            parseCss(css);
+        };
+
+        expect(badFn).to.throw(Error, 'selector missing');
+    });
+
+    it('throws an error when parsing @keyframes with missing name', function() {
+        const css = '@keyframes { from { opacity: 0; } to { opacity: 1; } }';
+        const badFn = function() {
+            parseCss(css);
+        };
+
+        expect(badFn).to.throw(Error, '@keyframes missing name');
+    });
+
+    it('throws an error when parsing @keyframes with missing open bracket', function() {
+        const css = '@keyframes test from { opacity: 0; } to { opacity: 1; } }';
+        const badFn = function() {
+            parseCss(css);
+        };
+
+        expect(badFn).to.throw(Error, '@keyframes missing \'{\'');
+    });
+
+    it('throws an error when parsing @keyframes with missing closing bracket', function() {
+        const css = '@keyframes test { from { opacity: 0; } to { opacity: 1; }';
+        const badFn = function() {
+            parseCss(css);
+        };
+
+        expect(badFn).to.throw(Error, '@keyframes missing \'}\'');
+    });
+});
diff --git a/tests/stringify-css.test.js b/tests/stringify-css.test.js
new file mode 100644
index 0000000..609fe3f
--- /dev/null
+++ b/tests/stringify-css.test.js
@@ -0,0 +1,47 @@
+// Dependencies
+// =============================================================================
+import loadFixtures from './helpers/load-fixtures';
+import parseCss     from '../src/parse-css';
+import stringifyCss from '../src/stringify-css';
+import { expect }   from 'chai';
+
+
+// Suite
+// =============================================================================
+describe('stringify-css', function() {
+    const fixtures = {};
+
+    // Hooks
+    // -------------------------------------------------------------------------
+    before(async function() {
+        await loadFixtures({
+            base: '/base/tests/fixtures/',
+            urls : [
+                'test-parse.css',
+                'test-stringify.css'
+            ]
+        }, fixtures);
+    });
+
+    // Tests
+    // -------------------------------------------------------------------------
+    it('converts AST to string', function() {
+        const cssIn     = fixtures['test-parse.css'];
+        const cssAst    = parseCss(cssIn);
+        const cssOut    = stringifyCss(cssAst);
+        const expectCss = fixtures['test-stringify.css'].replace(/\n/g,'');
+
+        expect(cssOut).to.equal(expectCss);
+    });
+
+    it('triggers callback for each node', function() {
+        const cssIn  = 'p { color: red; }';
+        const cssAst = parseCss(cssIn);
+
+        let callbackCount = 0;
+
+        stringifyCss(cssAst, '', node => { callbackCount++; });
+
+        expect(callbackCount).to.be.above(0);
+    });
+});
diff --git a/tests/transform-css.test.js b/tests/transform-css.test.js
new file mode 100644
index 0000000..8d96975
--- /dev/null
+++ b/tests/transform-css.test.js
@@ -0,0 +1,326 @@
+// Dependencies
+// =============================================================================
+import loadFixtures from './helpers/load-fixtures';
+import transformCss from '../src/transform-css';
+import { expect }   from 'chai';
+
+
+// Suite
+// =============================================================================
+describe('transform-css', function() {
+    const fixtures = {};
+
+    // Hooks
+    // -------------------------------------------------------------------------
+    before(async function() {
+        await loadFixtures({
+            base: '/base/tests/fixtures/',
+            urls : [
+                'test-parse.css',
+                'test-stringify.css'
+            ]
+        }, fixtures);
+    });
+
+    // Tests: Transforms
+    // -------------------------------------------------------------------------
+    describe('Transforms', function() {
+        it('transforms :root variable', function() {
+            const cssIn = `
+                :root { --color: red; }
+                p { color: var(--color); }
+            `;
+            const cssOut    = transformCss(cssIn);
+            const expectCss = `
+                :root { --color: red; }
+                p { color: red; color: var(--color); }
+            `.replace(/\n|\s/g, '');
+
+            expect(cssOut).to.equal(expectCss);
+        });
+
+        it('transforms :root variable with comments', function() {
+            const cssIn = `
+                :root {
+                    /* 1 */
+                    --color: /* 2 */ red /* 3 */;
+                    /* 4 */
+                }
+                p {
+                    /* 5 */
+                    color: /* 6 */ var(--color) /* 7 */;
+                    /* 8 */
+                }
+            `;
+            const cssOut    = transformCss(cssIn);
+            const expectCss = `
+                :root { --color: red; }
+                p { color: red; color: var(--color); }
+            `.replace(/\n|\s/g, '');
+
+            expect(cssOut).to.equal(expectCss);
+        });
+
+        it('transforms out-of-order :root variable', function() {
+            const cssIn = `
+                p { color: var(--color); }
+                :root { --color: red; }
+            `;
+            const cssOut = transformCss(cssIn);
+            const expectCss = `
+                p { color: red; color: var(--color); }
+                :root { --color: red; }
+            `.replace(/\n|\s/g, '');
+
+            expect(cssOut).to.equal(expectCss);
+        });
+
+        it('transforms chained :root variable', function() {
+            const cssIn = `
+                :root { --color1: var(--color2); }
+                :root { --color2: red; }
+                p { color: var(--color1); }
+            `;
+            const cssOut    = transformCss(cssIn);
+            const expectCss = `
+                :root { --color1: red; --color1: var(--color2); }
+                :root { --color2: red; }
+                p { color: red; color: var(--color1); }
+            `.replace(/\n|\s/g, '');
+
+            expect(cssOut).to.equal(expectCss);
+        });
+
+        it('transforms variable function fallback', function() {
+            const cssIn     = 'p { color: var(--fail, red); }';
+            const cssOut    = transformCss(cssIn);
+            const expectCss = 'p{color:red;color:var(--fail, red);}';
+
+            expect(cssOut).to.equal(expectCss);
+        });
+    });
+
+    // Tests: Options
+    // -------------------------------------------------------------------------
+    describe('Options', function() {
+        // The 'onlyVars' option is used in this module as well as the index.js
+        // module. Testing how this options is handled by each module is handled
+        // in each module's test file.
+        describe('onlyVars', function() {
+            it('true (declarations)', function() {
+                const cssIn = `
+                    /* Comment */
+                    :root { --color: red; }
+                    p { color: var(--color); }
+                    p { color: green; }
+                `;
+                const cssOut    = transformCss(cssIn, { onlyVars: true }).replace(/\n/g, '');
+                const expectCss = `
+                    :root{ --color:red; }
+                    p { color: red; color: var(--color); }
+                `.replace(/\n|\s/g, '');
+
+                expect(cssOut).to.equal(expectCss);
+            });
+
+            it('true (@font-face)', function() {
+                const cssIn = `
+                    :root { --weight: normal; }
+                    @font-face {
+                        font-family: "test1";
+                        font-weight: var(--weight);
+                    }
+                    @font-face {
+                        font-family: "test2";
+                        font-weight: bold;
+                    }
+                `;
+                const cssOut    = transformCss(cssIn, { onlyVars: true }).replace(/\n/g, '');
+                const expectCss = `
+                    :root { --weight: normal; }
+                    @font-face {
+                        font-family: "test1";
+                        font-weight: normal;
+                        font-weight: var(--weight);
+                    }
+                `.replace(/\n|\s/g, '');
+
+                expect(cssOut).to.equal(expectCss);
+            });
+
+            it('true (@keyframes)', function() {
+                const cssIn = `
+                    :root { --color: red; }
+                    @keyframes test1 {
+                        from { color: var(--color); }
+                        to { color: green; }
+                    }
+                    @keyframes test2 {
+                        from { color: red; }
+                        to { color: green; }
+                    }
+                `;
+                const cssOut    = transformCss(cssIn, { onlyVars: true }).replace(/\n/g, '');
+                const expectCss = `
+                    :root { --color: red;}
+                    @keyframes test1 {
+                        from { color: red; color: var(--color); }
+                        to { color: green; }
+                    }
+                `.replace(/\n|\s/g, '').replace(/@keyframes/, '@keyframes ');
+
+                expect(cssOut).to.equal(expectCss);
+            });
+
+            it('true (@media)', function() {
+                const cssIn = `
+                    :root { --color: red; }
+                    @media screen {
+                        p { color: var(--color); }
+                        p { color: green; }
+                    }
+                `;
+                const cssOut    = transformCss(cssIn, { onlyVars: true }).replace(/\n/g, '');
+                const expectCss = `
+                    :root { --color: red; }
+                    @media screen {
+                        p { color: red; color: var(--color); }
+                    }
+                `.replace(/\n|\s/g, '').replace(/@media/, '@media ');
+
+                expect(cssOut).to.equal(expectCss);
+            });
+        });
+
+        describe('preserve', function() {
+            it('true (default)', function() {
+                const cssIn     = `
+                    :root { --color: red; }
+                    p { color: var(--color); }
+                `;
+                const cssOut    = transformCss(cssIn).replace(/\n/g, '');
+                const expectCss = `
+                    :root { --color: red; }
+                    p { color: red; color: var(--color); }
+                `.replace(/\n|\s/g, '');
+
+                expect(cssOut).to.equal(expectCss);
+            });
+
+            it('false', function() {
+                const cssIn     = `
+                    :root { --color: red; --weight: normal; }
+                    p {
+                        color: var(--color);
+                    }
+                    @font-face {
+                        font-family: "test1";
+                        font-weight: var(--weight);
+                    }
+                    @keyframes test1 {
+                        from { color: var(--color); }
+                        to { color: green; }
+                    }
+                    @media screen {
+                        p { color: var(--color); }
+                    }
+                `;
+                const cssOut    = transformCss(cssIn, { preserve: false }).replace(/\n/g, '');
+                const expectCss = `
+                    p {
+                        color: red;
+                    }
+                    @font-face {
+                        font-family: "test1";
+                        font-weight: normal;
+                    }
+                    @keyframes test1 {
+                        from { color: red; }
+                        to { color: green; }
+                    }
+                    @media screen {
+                        p { color: red; }
+                    }
+                `.replace(/\n|\s/g, '').replace(/@keyframes/, '@keyframes ').replace(/@media/, '@media ');
+
+                expect(cssOut).to.equal(expectCss);
+            });
+        });
+
+        describe('variables', function() {
+            it('No leading --', function() {
+                const cssIn     = ':root{--color1:red}p{color:var(--color1)}p{color:var(--color2)}';
+                const cssOut    = transformCss(cssIn, {
+                    preserve : false,
+                    variables: { color2: 'green' }
+                }).replace(/\n/g, '');
+                const expectCss = 'p{color:red;}p{color:green;}';
+
+                expect(cssOut).to.equal(expectCss);
+            });
+
+            it('Malformed single -', function() {
+                const cssIn     = ':root{--color1:red}p{color:var(--color1)}p{color:var(--color2)}';
+                const cssOut    = transformCss(cssIn, {
+                    preserve : false,
+                    variables: { '-color2': 'green' }
+                }).replace(/\n/g, '');
+                const expectCss = 'p{color:red;}p{color:green;}';
+
+                expect(cssOut).to.equal(expectCss);
+            });
+
+            it('Leading --', function() {
+                const cssIn     = ':root{--color1:red}p{color:var(--color1)}p{color:var(--color2)}';
+                const cssOut    = transformCss(cssIn, {
+                    preserve : false,
+                    variables: { '--color2': 'green' }
+                }).replace(/\n/g, '');
+                const expectCss = 'p{color:red;}p{color:green;}';
+
+                expect(cssOut).to.equal(expectCss);
+            });
+
+            it('Override existing variable', function() {
+                const cssIn     = ':root{--color1:red}p{color:var(--color1)}p{color:var(--color2)}';
+                const cssOut    = transformCss(cssIn, {
+                    preserve : false,
+                    variables: {
+                        '--color1': 'blue',
+                        '--color2': 'green'
+                    }
+                }).replace(/\n/g, '');
+                const expectCss = 'p{color:blue;}p{color:green;}';
+
+                expect(cssOut).to.equal(expectCss);
+            });
+
+            it('Appends new :root element with vars', function() {
+                const cssIn     = 'p{color:var(--color1)}';
+                const cssOut    = transformCss(cssIn, {
+                    preserve : true,
+                    variables: { color1: 'red' }
+                }).replace(/\n/g, '');
+                const expectCss = 'p{color:red;color:var(--color1);}:root{--color1:red;}';
+
+                expect(cssOut).to.equal(expectCss);
+            });
+        });
+    });
+
+    // Tests: Callbacks
+    // -------------------------------------------------------------------------
+    describe('Callbacks', function() {
+        it('triggers onWarning callback with proper arguments', function() {
+            let onWarningCount = 0;
+
+            transformCss('p { color: var(--fail); }', {
+                onWarning() {
+                    onWarningCount++;
+                }
+            });
+
+            expect(onWarningCount).to.equal(1);
+        });
+    });
+});