diff --git a/package.json b/package.json
index 35bfcbc..c9bbeed 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,9 @@
     "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)",
     "Jason Switzer <jswitzer@gmail.com>"
   ],
+  "types": "types/index.d.ts",
   "files": [
+    "types/index.d.ts",
     "lib",
     "index.js"
   ],
@@ -36,8 +38,9 @@
   "devDependencies": {
     "browserify": "^16.0.0",
     "deepmerge": "^4.0.0",
+    "dtslint": "^3.6.12",
     "hast-util-to-html": "^7.0.0",
-    "hastscript": "^5.0.0",
+    "hastscript": "^6.0.0",
     "nyc": "^15.0.0",
     "prettier": "^2.0.0",
     "remark-cli": "^8.0.0",
@@ -54,7 +57,8 @@
     "build": "npm run build-bundle && npm run build-mangle",
     "test-api": "node test",
     "test-coverage": "nyc --reporter lcov tape test.js",
-    "test": "npm run format && npm run build && npm run test-coverage"
+    "test-types": "dtslint types",
+    "test": "npm run format && npm run build && npm run test-coverage && npm run test-types"
   },
   "nyc": {
     "check-coverage": true,
diff --git a/types/hast-util-sanitize-tests.ts b/types/hast-util-sanitize-tests.ts
new file mode 100644
index 0000000..fae0780
--- /dev/null
+++ b/types/hast-util-sanitize-tests.ts
@@ -0,0 +1,204 @@
+import h = require('hastscript')
+import u = require('unist-builder')
+import merge = require('deepmerge')
+import sanitize = require('hast-util-sanitize')
+
+// Taken from Readme
+const tree = h('div', {onmouseover: 'alert("alpha")'}, [
+  h(
+    'a',
+    {href: 'jAva script:alert("bravo")', onclick: 'alert("charlie")'},
+    'delta'
+  ),
+  u('text', '\n'),
+  h('script', 'alert("charlie")'),
+  u('text', '\n'),
+  h('img', {src: 'x', onerror: 'alert("delta")'}),
+  u('text', '\n'),
+  // eslint-disable-next-line no-script-url
+  h('iframe', {src: 'javascript:alert("echo")'}),
+  u('text', '\n'),
+  h('math', h('mi', {'xlink:href': 'data:x,<script>alert("foxtrot")</script>'}))
+])
+
+const gh: sanitize.Schema = {
+  strip: ['script'],
+  clobberPrefix: 'user-content-',
+  clobber: ['name', 'id'],
+  ancestors: {
+    tbody: ['table'],
+    tfoot: ['table'],
+    thead: ['table'],
+    td: ['table'],
+    th: ['table'],
+    tr: ['table']
+  },
+  protocols: {
+    href: ['http', 'https', 'mailto', 'xmpp', 'irc', 'ircs'],
+    cite: ['http', 'https'],
+    src: ['http', 'https'],
+    longDesc: ['http', 'https']
+  },
+  tagNames: [
+    'h1',
+    'h2',
+    'h3',
+    'h4',
+    'h5',
+    'h6',
+    'br',
+    'b',
+    'i',
+    'strong',
+    'em',
+    'a',
+    'pre',
+    'code',
+    'img',
+    'tt',
+    'div',
+    'ins',
+    'del',
+    'sup',
+    'sub',
+    'p',
+    'ol',
+    'ul',
+    'table',
+    'thead',
+    'tbody',
+    'tfoot',
+    'blockquote',
+    'dl',
+    'dt',
+    'dd',
+    'kbd',
+    'q',
+    'samp',
+    'var',
+    'hr',
+    'ruby',
+    'rt',
+    'rp',
+    'li',
+    'tr',
+    'td',
+    'th',
+    's',
+    'strike',
+    'summary',
+    'details',
+    'caption',
+    'figure',
+    'figcaption',
+    'abbr',
+    'bdo',
+    'cite',
+    'dfn',
+    'mark',
+    'small',
+    'span',
+    'time',
+    'wbr',
+    'input'
+  ],
+  attributes: {
+    a: ['href'],
+    img: ['src', 'longDesc'],
+    input: [
+      ['type', 'checkbox'],
+      ['disabled', true]
+    ],
+    li: [['className', 'task-list-item']],
+    div: ['itemScope', 'itemType'],
+    blockquote: ['cite'],
+    del: ['cite'],
+    ins: ['cite'],
+    q: ['cite'],
+    '*': [
+      'abbr',
+      'accept',
+      'acceptCharset',
+      'accessKey',
+      'action',
+      'align',
+      'alt',
+      'ariaDescribedBy',
+      'ariaHidden',
+      'ariaLabel',
+      'ariaLabelledBy',
+      'axis',
+      'border',
+      'cellPadding',
+      'cellSpacing',
+      'char',
+      'charOff',
+      'charSet',
+      'checked',
+      'clear',
+      'cols',
+      'colSpan',
+      'color',
+      'compact',
+      'coords',
+      'dateTime',
+      'dir',
+      'disabled',
+      'encType',
+      'htmlFor',
+      'frame',
+      'headers',
+      'height',
+      'hrefLang',
+      'hSpace',
+      'isMap',
+      'id',
+      'label',
+      'lang',
+      'maxLength',
+      'media',
+      'method',
+      'multiple',
+      'name',
+      'noHref',
+      'noShade',
+      'noWrap',
+      'open',
+      'prompt',
+      'readOnly',
+      'rel',
+      'rev',
+      'rows',
+      'rowSpan',
+      'rules',
+      'scope',
+      'selected',
+      'shape',
+      'size',
+      'span',
+      'start',
+      'summary',
+      'tabIndex',
+      'target',
+      'title',
+      'type',
+      'useMap',
+      'vAlign',
+      'value',
+      'vSpace',
+      'width',
+      'itemProp'
+    ]
+  },
+  required: {
+    input: {
+      type: 'checkbox',
+      disabled: true
+    }
+  }
+}
+
+const schema = merge(gh, {attributes: {'*': ['className']}})
+
+sanitize(tree)
+sanitize(tree, schema)
diff --git a/types/index.d.ts b/types/index.d.ts
new file mode 100644
index 0000000..aded122
--- /dev/null
+++ b/types/index.d.ts
@@ -0,0 +1,77 @@
+import {Node} from 'unist'
+
+declare namespace sanitize {
+  /**
+   * Possible HTML attribute values
+   */
+  type HTMLValue = string | number | boolean
+
+  /**
+   * Sanitization configuration
+   */
+  interface Schema {
+    /**
+     * Map of tag names to allowed property names
+     *
+     * The special '*' key defines property names allowed on all elements
+     */
+    attributes?: {
+      [key: string]: Array<string | [string, ...HTMLValue[]]>
+    }
+
+    /**
+     * Map of tag names to required property names and their default property value
+     */
+    required?: {[key: string]: {[key: string]: HTMLValue}}
+
+    /**
+     * List of allowed tag names
+     */
+    tagNames?: string[]
+
+    /**
+     * Map of protocols to allow in property values
+     */
+    protocols?: {[key: string]: string[]}
+
+    /**
+     * Map of tag names to their required ancestor elements
+     */
+    ancestors?: {[key: string]: string[]}
+
+    /**
+     * List of allowed property names which can clobber
+     */
+    clobber?: string[]
+
+    /**
+     * Prefix to use before potentially clobbering property names
+     */
+    clobberPrefix?: string
+
+    /**
+     * Names of elements to strip from the tree
+     */
+    strip?: string[]
+
+    /**
+     * Whether to allow comments
+     */
+    allowComments?: boolean
+
+    /**
+     * Whether to allow doctypes
+     */
+    allowDoctypes?: boolean
+  }
+}
+
+/**
+ * Hast utility to sanitize a tree
+ *
+ * @param tree Hast tree to sanitize
+ * @param schema Schema defining how to sanitize - defaults to Github style sanitation
+ */
+declare function sanitize(tree: Node, schema?: sanitize.Schema): Node
+
+export = sanitize
diff --git a/types/tsconfig.json b/types/tsconfig.json
new file mode 100644
index 0000000..3cecfb1
--- /dev/null
+++ b/types/tsconfig.json
@@ -0,0 +1,11 @@
+{
+  "compilerOptions": {
+    "lib": ["es2015"],
+    "strict": true,
+    "baseUrl": ".",
+    "resolveJsonModule": true,
+    "paths": {
+      "hast-util-sanitize": ["index.d.ts"]
+    }
+  }
+}
diff --git a/types/tslint.json b/types/tslint.json
new file mode 100644
index 0000000..70c4494
--- /dev/null
+++ b/types/tslint.json
@@ -0,0 +1,7 @@
+{
+  "extends": "dtslint/dtslint.json",
+  "rules": {
+    "semicolon": false,
+    "whitespace": false
+  }
+}