Refactor code-style to use xo

* Replace istanbul with nyc;
* Replace ESLint, jscs with xo;
* Update remark;
* Remove superfluous files;
* Remove unneeded Node Travis targets.

.editorconfig

@@ -2,14 +2,8 @@ root = true
 
 [*]
 indent_style = space
-indent_size = 4
+indent_size = 2
 end_of_line = lf
 charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
-
-[*.{json,svg,remarkrc,eslintrc}]
-indent_size = 2
-
-[*.md]
-trim_trailing_whitespace = false

.gitignore

@@ -1,5 +1,6 @@
 .DS_Store
 *.log
+.nyc_output/
 coverage/
 node_modules/
 remark-slug.js

.travis.yml

@@ -1,21 +1,17 @@
 language: node_js
 node_js:
 - '0.11'
-- '0.12'
-- '4.0'
 - '5.0'
 - '6.0'
-sudo: false
-after_success:
-- bash <(curl -s https://codecov.io/bash)
+after_success: bash <(curl -s https://codecov.io/bash)
 deploy:
   - provider: npm
     email: tituswormer@gmail.com
     api_key:
       secure: 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
     on:
       tags: true
-      node: '6.0'
+      node: '5.0'
   - provider: releases
     api_key:
       secure: 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

index.js

@@ -8,16 +8,38 @@
 
 'use strict';
 
-/* eslint-env commonjs */
-
-/*
- * Dependencies.
- */
-
+/* Dependencies. */
 var toString = require('mdast-util-to-string');
 var visit = require('unist-util-visit');
 var slugs = require('github-slugger')();
 
+/* Expose. */
+module.exports = attacher;
+
+/* Attacher. */
+function attacher() {
+  return transformer;
+}
+
+/* Patch slugs on heading nodes. */
+function transformer(ast) {
+  slugs.reset();
+
+  visit(ast, 'heading', function (node) {
+    var id = slugs.slug(toString(node));
+    var data = patch(node, 'data', {});
+
+    /* Non-html */
+    patch(data, 'id', id);
+    /* Legacy remark-html */
+    patch(data, 'htmlAttributes', {});
+    /* Current remark-html */
+    patch(data, 'hProperties', {});
+    patch(data.htmlAttributes, 'id', id);
+    patch(data.hProperties, 'id', id);
+  });
+}
+
 /**
  * Patch `value` on `context` at `key`, if
  * `context[key]` does not already exist.
@@ -27,50 +49,9 @@ var slugs = require('github-slugger')();
  * @param {*} value - Value to patch.
  */
 function patch(context, key, value) {
-    if (!context[key]) {
-        context[key] = value;
-    }
-
-    return context[key];
-}
-
-/**
- * Patch slugs on heading nodes.
- *
- * Transformer is invoked for every file, so there’s no need
- * to specify extra logic to get per-file slug pools.
- *
- * @param {Node} ast - Root node.
- */
-function transformer(ast) {
-    slugs.reset();
+  if (!context[key]) {
+    context[key] = value;
+  }
 
-    visit(ast, 'heading', function (node) {
-        var id = slugs.slug(toString(node));
-        var data = patch(node, 'data', {});
-
-        /* Non-html */
-        patch(data, 'id', id);
-        /* Legacy remark-html */
-        patch(data, 'htmlAttributes', {});
-        /* Current remark-html */
-        patch(data, 'hProperties', {});
-        patch(data.htmlAttributes, 'id', id);
-        patch(data.hProperties, 'id', id);
-    });
+  return context[key];
 }
-
-/**
- * Attacher.
- *
- * @return {Function} - Transformer.
- */
-function attacher() {
-    return transformer;
-}
-
-/*
- * Expose.
- */
-
-module.exports = attacher;

package.json

@@ -31,32 +31,34 @@
   ],
   "devDependencies": {
     "browserify": "^13.0.0",
-    "eslint": "^3.0.0",
     "esmangle": "^1.0.0",
-    "istanbul": "^0.4.0",
-    "jscs": "^3.0.0",
-    "jscs-jsdoc": "^2.0.0",
+    "nyc": "^8.1.0",
     "remark": "^6.0.0",
-    "remark-cli": "^1.0.0",
-    "remark-comment-config": "^4.0.0",
-    "remark-github": "^5.0.0",
-    "remark-html": "^3.0.0",
-    "remark-lint": "^4.0.0",
-    "remark-usage": "^4.0.0",
-    "remark-validate-links": "^4.0.0",
+    "remark-cli": "^2.0.0",
+    "remark-preset-wooorm": "^1.0.0",
     "tape": "^4.0.0",
-    "unist-util-remove-position": "^1.1.0"
+    "unist-builder": "^1.0.2",
+    "unist-util-remove-position": "^1.1.0",
+    "xo": "^0.16.0"
   },
   "scripts": {
     "build-bundle": "browserify index.js --no-builtins -s remarkSlug > remark-slug.js",
     "build-mangle": "esmangle remark-slug.js > remark-slug.min.js",
     "build-md": "remark . --quiet --frail",
     "build": "npm run build-md && npm run build-bundle && npm run build-mangle",
-    "lint-api": "eslint .",
-    "lint-style": "jscs --reporter inline .",
-    "lint": "npm run lint-api && npm run lint-style",
+    "lint": "xo",
     "test-api": "node test.js",
-    "test-coverage": "istanbul cover test.js",
+    "test-coverage": "nyc --reporter lcov tape test.js",
     "test": "npm run build && npm run lint && npm run test-coverage"
+  },
+  "xo": {
+    "space": true,
+    "ignores": [
+      "remark-slug.js"
+    ]
+  },
+  "remarkConfig": {
+    "output": true,
+    "presets": "wooorm"
   }
 }

readme.md

@@ -46,7 +46,7 @@ Yields:
 
 Adds slugs to markdown headings.
 
-Sets `data.id`, `data.hProperties.id` on heading nodes. The first can be
+Sets `data.id`, `data.hProperties.id` on heading nodes.  The first can be
 used by any plugin as a unique identifier, the second tells **remark-html**
 to use its value as an `id` attribute. **remark-slug** does not overwrite
 these values when they already exist.