Merge pull request #186 from squidfunk/chore/flow-type-checking

Integrate static type-checking with JSDoc and Flow

.eslintignore

@@ -23,6 +23,10 @@
 /material
 /site
 
+# Files used and generated by flow
+/lib/declarations
+/tmp
+
 # Files generated by visual tests
 /gemini-report
 /tests/visual/data

.eslintrc

@@ -169,7 +169,7 @@
     "space-unary-ops": 2,
     "spaced-comment": [2, "always", {
       "line": {
-        "markers": ["/"],
+        "markers": ["/", ":"],
         "exceptions": ["-", "+"]
       },
       "block": {

.flowconfig

@@ -0,0 +1,8 @@
+[ignore]
+.*/node_modules/.*
+
+[libs]
+lib/declarations/
+
+[options]
+strip_root=true

.githooks/pre-commit/check.sh

@@ -45,17 +45,25 @@ git checkout -- .
 FILES=$(git diff --cached --name-only --diff-filter=ACMR | \
   grep "\.\(js\|jsx\|scss\)$")
 
-# Run the check and print indicator
+# Run check and print indicator
 if [ "$FILES" ]; then
-  npm run lint --silent
 
-  # If we're on master, abort commit
+  # If linter terminated with errors, abort commit
   if [ $? -gt 0 ]; then
     echo -e "\x1B[31m✗\x1B[0m Linter - \x1B[31m$MESSAGE\x1B[0m"
     exit 1
   else
     echo -e "\x1B[32m✓\x1B[0m Linter"
   fi
+
+  # If flow terminated with errors, abort commit
+  npm run flow --silent > /dev/null
+  if [ $? -gt 0 ]; then
+    echo -e "\x1B[31m✗\x1B[0m Flow - \x1B[31m$MESSAGE\x1B[0m"
+    exit 1
+  else
+    echo -e "\x1B[32m✓\x1B[0m Flow"
+  fi
 fi
 
 # We're good

.gitignore

@@ -24,6 +24,7 @@
 # NPM-related
 /node_modules
 /npm-debug.log*
+/yarn-error.log
 
 # Files generated by build
 /build
@@ -31,6 +32,9 @@
 /MANIFEST
 /site
 
+# Files generated by flow typechecker
+/tmp
+
 # Files generated by visual tests
 /gemini-report
 /tests/visual/baseline/local

Gulpfile.babel.js

@@ -55,9 +55,11 @@ let args = yargs
   .default("sourcemaps", false)        /* Create sourcemaps */
   .argv
 
-/* Only use the last value seen, so overrides are possible */
+/* Only use the last seen value if boolean, so overrides are possible */
 args = Object.keys(args).reduce((result, arg) => {
-  result[arg] = [].concat(args[arg]).pop()
+  result[arg] = Array.isArray(args[arg]) && typeof args[arg][0] === "boolean"
+    ? [].concat(args[arg]).pop()
+    : args[arg]
   return result
 }, {})
 
@@ -147,19 +149,28 @@ gulp.task("assets:images:clean",
 
 /*
  * Build application logic
+ *
+ * When revisioning, the build must be serialized due to race conditions
+ * happening when two tasks try to write manifest.json simultaneously
  */
-gulp.task("assets:javascripts:build:application",
+gulp.task("assets:javascripts:build:application", args.revision ? [
-  load("assets/javascripts/build/application"))
+  "assets:stylesheets:build"
+] : [], load("assets/javascripts/build/application"))
 
 /*
  * Build custom modernizr
+ *
+ * When revisioning, the build must be serialized due to race conditions
+ * happening when two tasks try to write manifest.json simultaneously
  */
 gulp.task("assets:javascripts:build:modernizr", [
   "assets:stylesheets:build"
-], load("assets/javascripts/build/modernizr"))
+].concat(args.revision ? [
+  "assets:javascripts:build:application"
+] : []), load("assets/javascripts/build/modernizr"))
 
 /*
- * Build application logic and modernizr
+ * Build application logic and Modernizr
  */
 gulp.task("assets:javascripts:build", (args.clean ? [
   "assets:javascripts:clean"
@@ -178,6 +189,12 @@ gulp.task("assets:javascripts:build", (args.clean ? [
 gulp.task("assets:javascripts:clean",
   load("assets/javascripts/clean"))
 
+/*
+ * Annotate JavaScript
+ */
+gulp.task("assets:javascripts:annotate",
+  load("assets/javascripts/annotate"))
+
 /*
  * Lint JavaScript
  */

lib/declarations/fastclick.js

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2016-2017 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/* ----------------------------------------------------------------------------
+ * Declarations
+ * ------------------------------------------------------------------------- */
+
+declare module "fastclick" {
+
+  /* Type: FastClick */
+  declare type FastClick = {
+    attach(name: HTMLElement): void
+  }
+
+  /* Exports */
+  declare export default FastClick
+}

lib/declarations/js-cookie.js

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2016-2017 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/* ----------------------------------------------------------------------------
+ * Declarations
+ * ------------------------------------------------------------------------- */
+
+declare module "js-cookie" {
+
+  /* Type: Options for setting cookie values */
+  declare type Options = {
+    path?: string,
+    expires?: number | string
+  }
+
+  /* Type: Cookie */
+  declare type Cookie = {
+    getJSON(json: string): Object,
+    set(key: string, value: string, options?: Options): string
+  }
+
+  /* Exports */
+  declare export default Cookie
+}

lib/declarations/jsx.js

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2016-2017 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/* ----------------------------------------------------------------------------
+ * Declarations
+ * ------------------------------------------------------------------------- */
+
+declare class Jsx {
+  static createElement(tag: string, properties?: Object,
+    ...children?: Array<string | number | Array<HTMLElement>>
+  ): HTMLElement
+}
+
+/* Exports */
+declare export default Jsx

lib/declarations/lunr.js

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2016-2017 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/* ----------------------------------------------------------------------------
+ * Declarations
+ * ------------------------------------------------------------------------- */
+
+/*
+ * Currently, it's not possible to export a function that returns a class type,
+ * as the imports just don't correctly work with flow. As a workaround we
+ * export an object until this error is fixed.
+ */
+declare module "lunr" {
+  declare function exports(name: () => void): Object
+}

lib/declarations/modernizr.js

@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2016-2017 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/* ----------------------------------------------------------------------------
+ * Declarations
+ * ------------------------------------------------------------------------- */
+
+declare class Modernizr {
+  static addTest(name: string, test: () => boolean): void
+}
+
+/* Exports */
+declare export default Modernizr

lib/providers/jsx.js

@@ -24,13 +24,13 @@
  * Module
  * ------------------------------------------------------------------------- */
 
-export default /* JSX */ {
+export default /* Jsx */ {
 
   /**
    * Create a native DOM node from JSX's intermediate representation
    *
    * @param {string} tag - Tag name
-   * @param {object} properties - Properties
+   * @param {?Object} properties - Properties
    * @param {...(string|number|Array)} children - Child nodes
    * @return {HTMLElement} Native DOM node
    */

lib/tasks/assets/javascripts/annotate.js

@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2016-2017 Martin Donath <martin.donath@squidfunk.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+import { transform } from "babel-core"
+import jsdoc2flow from "flow-jsdoc"
+import through from "through2"
+
+/* ----------------------------------------------------------------------------
+ * Task: annotate JavaScript
+ * ------------------------------------------------------------------------- */
+
+export default (gulp, config) => {
+  return () => {
+    return gulp.src(`${config.assets.src}/javascripts/**/*.{js,jsx}`)
+
+      /* Linting */
+      .pipe(
+        through.obj(function(file, enc, done) {
+          if (file.isNull() || file.isStream())
+            return done()
+
+          /* Perform Babel transformation to resolve JSX calls */
+          const transformed = transform(file.contents.toString(), {
+            plugins: [
+              ["transform-react-jsx", {
+                "pragma": "Jsx.createElement"
+              }]
+            ]
+          })
+
+          /* Annotate contents */
+          file.contents = new Buffer(jsdoc2flow(
+            `/* @flow */\n\n${transformed.code}`
+          ).toString())
+
+          /* Push file to next stage */
+          this.push(file)
+          done()
+        }))
+
+      /* Print errors */
+      .pipe(gulp.dest("tmp/assets/javascripts"))
+  }
+}

lib/tasks/assets/javascripts/build/application.js

@@ -70,7 +70,7 @@ export default (gulp, config, args) => {
 
             /* Provide JSX helper */
             new webpack.ProvidePlugin({
-              JSX: path.join(process.cwd(), `${config.lib}/providers/jsx.js`)
+              Jsx: path.join(process.cwd(), `${config.lib}/providers/jsx.js`)
             })
           ].concat(
 

lib/tasks/assets/javascripts/lint.js

@@ -39,7 +39,7 @@ const format = eslint.getFormatter()
 
 export default (gulp, config) => {
   return () => {
-    return gulp.src(`${config.assets.src}/javascripts/**/*.js`)
+    return gulp.src(`${config.assets.src}/javascripts/**/*.{js,jsx}`)
 
       /* Linting */
       .pipe(

material/base.html

@@ -141,7 +141,7 @@
       {% endblock %}
     </div>
     {% block scripts %}
-      <script src="{{ base_url }}/assets/javascripts/application-0dae3d4464.js"></script>
+      <script src="{{ base_url }}/assets/javascripts/application-8dc3dfc020.js"></script>
       <script>app.initialize({url:{base:"{{ base_url }}"}})</script>
       {% for path in extra_javascript %}
         <script src="{{ path }}"></script>

material/partials/search.html

@@ -3,7 +3,7 @@
   <div class="md-search__overlay"></div>
   <div class="md-search__inner">
     <form class="md-search__form" name="search">
-      <input type="text" class="md-search__input" name="query" placeholder="{{ lang.t('search.placeholder') }}" accesskey="s" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false">
+      <input type="text" class="md-search__input" name="query" placeholder="{{ lang.t('search.placeholder') }}" accesskey="s" autocapitalize="off" autocorrect="off" autocomplete="off" spellcheck="false" data-md-component="query">
       <label class="md-icon md-search__icon" for="search"></label>
     </form>
     <div class="md-search__output">

package.json

@@ -25,6 +25,7 @@
   "scripts": {
     "build": "scripts/build",
     "clean": "scripts/clean",
+    "flow": "scripts/flow",
     "lint": "scripts/lint",
     "start": "scripts/start",
     "test:visual:run": "scripts/test/visual/run",
@@ -34,7 +35,7 @@
   "dependencies": {},
   "devDependencies": {
     "autoprefixer": "^6.7.3",
-    "babel-core": "^6.0.0",
+    "babel-core": "^6.23.0",
     "babel-eslint": "^7.1.1",
     "babel-loader": "^6.3.1",
     "babel-plugin-add-module-exports": "^0.2.1",
@@ -48,8 +49,10 @@
     "custom-event-polyfill": "^0.3.0",
     "del": "^2.2.2",
     "ecstatic": "^2.1.0",
-    "eslint": "^3.14.0",
+    "eslint": "^3.16.0",
     "fastclick": "^1.0.6",
+    "flow-bin": "^0.39.0",
+    "flow-jsdoc": "^0.2.2",
     "git-hooks": "^1.1.7",
     "gulp": "^3.9.1",
     "gulp-changed": "^2.0.0",
@@ -93,14 +96,6 @@
     "chai": "^3.5.0",
     "eslint-plugin-mocha": "^4.8.0",
     "gemini": "^4.14.3",
-    "karma": "^1.3.0",
-    "karma-chrome-launcher": "^2.0.0",
-    "karma-coverage": "^1.1.1",
-    "karma-mocha": "^1.3.0",
-    "karma-notify-reporter": "^1.0.1",
-    "karma-sourcemap-loader": "^0.3.7",
-    "karma-spec-reporter": "0.0.26",
-    "karma-webpack": "^2.0.1",
     "mocha": "^3.2.0",
     "moniker": "^0.1.2",
     "saucelabs": "^1.4.0",

scripts/flow

@@ -0,0 +1,44 @@
+#!/bin/bash
+
+# Copyright (c) 2016-2017 Martin Donath <martin.donath@squidfunk.com>
+
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to
+# deal in the Software without restriction, including without limitation the
+# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+# sell copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+# IN THE SOFTWARE.
+
+# Check if "npm install" was executed
+if [[ ! -d `npm bin` ]]; then
+  echo "\"node_modules\" not found:"
+  echo "npm install"
+  exit 1
+fi
+
+# Annotate source files
+`npm bin`/gulp assets:javascripts:annotate "$@"
+FLOW_JSDOC=$?
+
+# Run flow typecheck
+`npm bin`/flow check tmp
+FLOW=$?
+
+# If one command failed, exit with error
+if [ $FLOW_JSDOC -gt 0 ] || [ $FLOW -gt 0 ]; then
+  exit 1
+fi;
+
+# Otherwise return with success
+exit 0

src/.babelrc

@@ -4,7 +4,7 @@
   ],
   "plugins": [
     ["transform-react-jsx", {
-      "pragma": "JSX.createElement"
+      "pragma": "Jsx.createElement"
     }]
   ]
 }

src/assets/javascripts/application.js

@@ -27,24 +27,26 @@ import Material from "./components/Material"
  * Application
  * ------------------------------------------------------------------------- */
 
-export const initialize = config => {
+/**
+ * Initialize Material for MkDocs
+ *
+ * @param {Object} config - Configuration
+ */
+function initialize(config) { // eslint-disable-line func-style
 
   /* Initialize Modernizr and FastClick */
   new Material.Event.Listener(document, "DOMContentLoaded", () => {
+    if (!(document.body instanceof HTMLElement))
+      throw new ReferenceError
+
+    /* Attach FastClick to mitigate 300ms delay on touch devices */
+    FastClick.attach(document.body)
 
     /* Test for iOS */
     Modernizr.addTest("ios", () => {
       return !!navigator.userAgent.match(/(iPad|iPhone|iPod)/g)
     })
 
-    /* Test for web application context */
-    Modernizr.addTest("standalone", () => {
-      return !!navigator.standalone
-    })
-
-    /* Attach FastClick to mitigate 300ms delay on touch devices */
-    FastClick.attach(document.body)
-
     /* Wrap all data tables for better overflow scrolling */
     const tables = document.querySelectorAll("table:not([class])")
     Array.prototype.forEach.call(tables, table => {
@@ -119,7 +121,7 @@ export const initialize = config => {
       new Material.Search.Lock("[data-md-toggle=search]")))
 
   /* Component: search results */
-  new Material.Event.Listener(document.forms.search.query, [
+  new Material.Event.Listener("[data-md-component=query]", [
     "focus", "keyup"
   ], new Material.Search.Result("[data-md-component=result]", () => {
     return fetch(`${config.url.base}/mkdocs/search_index.json`, {
@@ -143,6 +145,8 @@ export const initialize = config => {
     new Material.Event.Listener("[data-md-component=navigation] [href^='#']",
       "click", () => {
         const toggle = document.querySelector("[data-md-toggle=drawer]")
+        if (!(toggle instanceof HTMLInputElement))
+          throw new ReferenceError
         if (toggle.checked) {
           toggle.checked = false
           toggle.dispatchEvent(new CustomEvent("change"))
@@ -152,16 +156,23 @@ export const initialize = config => {
   /* Listener: focus input after opening search */
   new Material.Event.Listener("[data-md-toggle=search]", "change", ev => {
     setTimeout(toggle => {
-      const query = document.forms.search.query
+      if (!(toggle instanceof HTMLInputElement))
-      if (toggle.checked)
+        throw new ReferenceError
+      if (toggle.checked) {
+        const query = document.querySelector("[data-md-component=query]")
+        if (!(query instanceof HTMLInputElement))
+          throw new ReferenceError
         query.focus()
+      }
     }, 400, ev.target)
   }).listen()
 
   /* Listener: open search on focus */
   new Material.Event.MatchMedia("(min-width: 960px)",
-    new Material.Event.Listener(document.forms.search.query, "focus", () => {
+    new Material.Event.Listener("[data-md-component=query]", "focus", () => {
       const toggle = document.querySelector("[data-md-toggle=search]")
+      if (!(toggle instanceof HTMLInputElement))
+        throw new ReferenceError
       if (!toggle.checked) {
         toggle.checked = true
         toggle.dispatchEvent(new CustomEvent("change"))
@@ -172,6 +183,8 @@ export const initialize = config => {
   new Material.Event.MatchMedia("(min-width: 960px)",
     new Material.Event.Listener(document.body, "click", () => {
       const toggle = document.querySelector("[data-md-toggle=search]")
+      if (!(toggle instanceof HTMLInputElement))
+        throw new ReferenceError
       if (toggle.checked) {
         toggle.checked = false
         toggle.dispatchEvent(new CustomEvent("change"))
@@ -183,10 +196,15 @@ export const initialize = config => {
     const code = ev.keyCode || ev.which
     if (code === 27) {
       const toggle = document.querySelector("[data-md-toggle=search]")
+      if (!(toggle instanceof HTMLInputElement))
+        throw new ReferenceError
       if (toggle.checked) {
         toggle.checked = false
         toggle.dispatchEvent(new CustomEvent("change"))
-        document.forms.search.query.blur()
+        const query = document.querySelector("[data-md-component=query]")
+        if (!(query instanceof HTMLInputElement))
+          throw new ReferenceError
+        query.focus()
       }
     }
   }).listen()
@@ -204,13 +222,16 @@ export const initialize = config => {
   /* Retrieve facts for the given repository type */
   ;(() => {
     const el = document.querySelector("[data-md-source]")
-    if (!el) return Promise.resolve([])
+    if (!el)
+      return Promise.resolve([])
+    else if (!(el instanceof HTMLAnchorElement))
+      throw new ReferenceError
     switch (el.dataset.mdSource) {
       case "github": return new Material.Source.Adapter.GitHub(el).fetch()
       default: return Promise.resolve([])
     }
 
-  /* Render repository source information */
+  /* Render repository information */
   })().then(facts => {
     const sources = document.querySelectorAll("[data-md-source]")
     Array.prototype.forEach.call(sources, source => {
@@ -219,3 +240,11 @@ export const initialize = config => {
     })
   })
 }
+
+/* ----------------------------------------------------------------------------
+ * Exports
+ * ------------------------------------------------------------------------- */
+
+export {
+  initialize
+}

src/assets/javascripts/components/Material/Event/Listener.js

@@ -30,14 +30,22 @@ export default class Listener {
    * Generic event listener
    *
    * @constructor
-   * @param {(string|NodeList<HTMLElement>)} els - Selector or HTML elements
+   *
-   * @param {Array.<string>} events - Event names
+   * @property {(Array<EventTarget>)} els_ - Event targets
-   * @param {(object|function)} handler - Handler to be invoked
+   * @property {Object} handler_- Event handlers
+   * @property {Array<string>} events_ - Event names
+   * @property {Function} update_ - Update handler
+   *
+   * @param {?(string|EventTarget|NodeList<EventTarget>)} els -
+   *   Selector or Event targets
+   * @param {(string|Array<string>)} events - Event names
+   * @param {(Object|Function)} handler - Handler to be invoked
    */
   constructor(els, events, handler) {
-    this.els_ = (typeof els === "string")
+    this.els_ = Array.prototype.slice.call(
+      (typeof els === "string")
         ? document.querySelectorAll(els)
-      : [].concat(els)
+        : [].concat(els))
 
     /* Set handler as function or directly as object */
     this.handler_ = typeof handler === "function"
@@ -53,7 +61,7 @@ export default class Listener {
    * Register listener for all relevant events
    */
   listen() {
-    Array.prototype.forEach.call(this.els_, el => {
+    this.els_.forEach(el => {
       this.events_.forEach(event => {
         el.addEventListener(event, this.update_, false)
       })
@@ -68,7 +76,7 @@ export default class Listener {
    * Unregister listener for all relevant events
    */
   unlisten() {
-    Array.prototype.forEach.call(this.els_, el => {
+    this.els_.forEach(el => {
       this.events_.forEach(event => {
         el.removeEventListener(event, this.update_)
       })

src/assets/javascripts/components/Material/Event/MatchMedia.js

@@ -20,6 +20,8 @@
  * IN THE SOFTWARE.
  */
 
+import Listener from "./Listener" // eslint-disable-line no-unused-vars
+
 /* ----------------------------------------------------------------------------
  * Class
  * ------------------------------------------------------------------------- */
@@ -33,6 +35,9 @@ export default class MatchMedia {
    * switches the given listeners on or off.
    *
    * @constructor
+   *
+   * @property {Function} handler_ - Media query event handler
+   *
    * @param {string} query - Media query to test for
    * @param {Listener} listener - Event listener
    */

src/assets/javascripts/components/Material/Nav/Blur.js

@@ -27,9 +27,16 @@
 export default class Blur {
 
   /**
-   * Blur anchors within the navigation above current page y-offset
+   * Blur links within the table of contents above current page y-offset
    *
    * @constructor
+   *
+   * @property {NodeList<HTMLElement>} els_ - Table of contents links
+   * @property {Array<HTMLElement>} anchors_ - Referenced anchor nodes
+   * @property {number} index_ - Current link index
+   * @property {number} offset_ - Current page y-offset
+   * @property {boolean} dir_ - Scroll direction change
+   *
    * @param {(string|NodeList<HTMLElement>)} els - Selector or HTML elements
    */
   constructor(els) {
@@ -45,20 +52,21 @@ export default class Blur {
     this.dir_ = false
 
     /* Index anchor node offsets for fast lookup */
-    this.anchors_ = [].map.call(this.els_, el => {
+    this.anchors_ = [].reduce.call(this.els_, (anchors, el) => {
-      return document.getElementById(el.hash.substring(1))
+      return anchors.concat(
-    })
+        document.getElementById(el.hash.substring(1)) || [])
+    }, [])
   }
 
   /**
-   * Initialize anchor states
+   * Initialize blur states
    */
   setup() {
     this.update()
   }
 
   /**
-   * Update anchor states
+   * Update blur states
    *
    * Deduct the static offset of the header (56px) and sidebar offset (24px),
    * see _permalinks.scss for more information.
@@ -67,7 +75,7 @@ export default class Blur {
     const offset = window.pageYOffset
     const dir = this.offset_ - offset < 0
 
-    /* Hack: reset index if direction changed, to catch very fast scrolling,
+    /* Hack: reset index if direction changed to catch very fast scrolling,
        because otherwise we would have to register a timer and that sucks */
     if (this.dir_ !== dir)
       this.index_ = dir
@@ -109,7 +117,7 @@ export default class Blur {
   }
 
   /**
-   * Reset anchor states
+   * Reset blur states
    */
   reset() {
     Array.prototype.forEach.call(this.els_, el => {

src/assets/javascripts/components/Material/Nav/Collapse.js

@@ -30,12 +30,18 @@ export default class Collapse {
    * Expand or collapse navigation on toggle
    *
    * @constructor
+   *
+   * @property {HTMLElement} el_ - Navigation list
+   *
    * @param {(string|HTMLElement)} el - Selector or HTML element
    */
   constructor(el) {
-    this.el_ = (typeof el === "string")
+    const ref = (typeof el === "string")
       ? document.querySelector(el)
       : el
+    if (!(ref instanceof HTMLElement))
+      throw new ReferenceError
+    this.el_ = ref
   }
 
   /**
@@ -75,11 +81,16 @@ export default class Collapse {
 
     /* Remove state on end of transition */
     const end = ev => {
-      ev.target.removeAttribute("data-md-state")
+      const target = ev.target
-      ev.target.style.maxHeight = ""
+      if (!(target instanceof HTMLElement))
+        throw new ReferenceError
+
+      /* Reset height and state */
+      target.removeAttribute("data-md-state")
+      target.style.maxHeight = ""
 
       /* Only fire once, so directly remove event listener */
-      ev.target.removeEventListener("transitionend", end)
+      target.removeEventListener("transitionend", end)
     }
     this.el_.addEventListener("transitionend", end, false)
   }

src/assets/javascripts/components/Material/Nav/Scrolling.js

@@ -30,12 +30,18 @@ export default class Scrolling {
    * Set overflow scrolling on the current active pane (for iOS)
    *
    * @constructor
+   *
+   * @property {HTMLElement} el_ - Primary navigation
+   *
    * @param {(string|HTMLElement)} el - Selector or HTML element
    */
   constructor(el) {
-    this.el_ = (typeof el === "string")
+    const ref = (typeof el === "string")
       ? document.querySelector(el)
       : el
+    if (!(ref instanceof HTMLElement))
+      throw new ReferenceError
+    this.el_ = ref
   }
 
   /**
@@ -49,13 +55,22 @@ export default class Scrolling {
     /* Find all toggles and check which one is active */
     const toggles = this.el_.querySelectorAll("[data-md-toggle]")
     Array.prototype.forEach.call(toggles, toggle => {
+      if (!(toggle instanceof HTMLInputElement))
+        throw new ReferenceError
       if (toggle.checked) {
 
         /* Find corresponding navigational pane */
         let pane = toggle.nextElementSibling
-        while (pane.tagName !== "NAV")
+        if (!(pane instanceof HTMLElement))
+          throw new ReferenceError
+        while (pane.tagName !== "NAV" && pane.nextElementSibling)
           pane = pane.nextElementSibling
 
+        /* Check references */
+        if (!(toggle.parentNode instanceof HTMLElement) ||
+            !(toggle.parentNode.parentNode instanceof HTMLElement))
+          throw new ReferenceError
+
         /* Find current and parent list elements */
         const parent = toggle.parentNode.parentNode
         const target = pane.children[pane.children.length - 1]
@@ -73,34 +88,48 @@ export default class Scrolling {
    * @param {Event} ev - Change event
    */
   update(ev) {
+    const target = ev.target
+    if (!(target instanceof HTMLElement))
+      throw new ReferenceError
 
     /* Find corresponding navigational pane */
-    let pane = ev.target.nextElementSibling
+    let pane = target.nextElementSibling
-    while (pane.tagName !== "NAV")
+    if (!(pane instanceof HTMLElement))
+      throw new ReferenceError
+    while (pane.tagName !== "NAV" && pane.nextElementSibling)
       pane = pane.nextElementSibling
 
-    /* Find current and parent list elements */
+    /* Check references */
-    const parent = ev.target.parentNode.parentNode
+    if (!(target.parentNode instanceof HTMLElement) ||
-    const target = pane.children[pane.children.length - 1]
+        !(target.parentNode.parentNode instanceof HTMLElement))
+      throw new ReferenceError
+
+    /* Find parent and active panes */
+    const parent = target.parentNode.parentNode
+    const active = pane.children[pane.children.length - 1]
 
     /* Always reset all lists when transitioning */
     parent.style.webkitOverflowScrolling = ""
-    target.style.webkitOverflowScrolling = ""
+    active.style.webkitOverflowScrolling = ""
 
-    /* Set overflow scrolling on parent */
+    /* Set overflow scrolling on parent pane */
-    if (!ev.target.checked) {
+    if (!target.checked) {
       const end = () => {
+        if (pane instanceof HTMLElement) {
           parent.style.webkitOverflowScrolling = "touch"
           pane.removeEventListener("transitionend", end)
         }
+      }
       pane.addEventListener("transitionend", end, false)
     }
 
-    /* Set overflow scrolling on target */
+    /* Set overflow scrolling on active pane */
-    if (ev.target.checked) {
+    if (target.checked) {
       const end = () => {
-        target.style.webkitOverflowScrolling = "touch"
+        if (pane instanceof HTMLElement) {
-        pane.removeEventListener("transitionend", end, false)
+          active.style.webkitOverflowScrolling = "touch"
+          pane.removeEventListener("transitionend", end)
+        }
       }
       pane.addEventListener("transitionend", end, false)
     }
@@ -117,20 +146,29 @@ export default class Scrolling {
     /* Find all toggles and check which one is active */
     const toggles = this.el_.querySelectorAll("[data-md-toggle]")
     Array.prototype.forEach.call(toggles, toggle => {
+      if (!(toggle instanceof HTMLInputElement))
+        throw new ReferenceError
       if (toggle.checked) {
 
         /* Find corresponding navigational pane */
         let pane = toggle.nextElementSibling
-        while (pane.tagName !== "NAV")
+        if (!(pane instanceof HTMLElement))
+          throw new ReferenceError
+        while (pane.tagName !== "NAV" && pane.nextElementSibling)
           pane = pane.nextElementSibling
 
-        /* Find current and parent list elements */
+        /* Check references */
+        if (!(toggle.parentNode instanceof HTMLElement) ||
+            !(toggle.parentNode.parentNode instanceof HTMLElement))
+          throw new ReferenceError
+
+        /* Find parent and active panes */
         const parent = toggle.parentNode.parentNode
-        const target = pane.children[pane.children.length - 1]
+        const active = pane.children[pane.children.length - 1]
 
         /* Always reset all lists when transitioning */
         parent.style.webkitOverflowScrolling = ""
-        target.style.webkitOverflowScrolling = ""
+        active.style.webkitOverflowScrolling = ""
       }
     })
   }

src/assets/javascripts/components/Material/Search/Lock.js

@@ -30,12 +30,25 @@ export default class Lock {
    * Lock body for full-screen search modal
    *
    * @constructor
+   *
+   * @property {HTMLInputElement} el_ - Lock toggle
+   * @property {HTMLElement} lock_ - Element to lock (document body)
+   * @property {number} offset_ - Current page y-offset
+   *
    * @param {(string|HTMLElement)} el - Selector or HTML element
    */
   constructor(el) {
-    this.el_ = (typeof el === "string")
+    const ref = (typeof el === "string")
       ? document.querySelector(el)
       : el
+    if (!(ref instanceof HTMLInputElement))
+      throw new ReferenceError
+    this.el_ = ref
+
+    /* Retrieve element to lock (= body) */
+    if (!document.body)
+      throw new ReferenceError
+    this.lock_ = document.body
   }
 
   /**
@@ -60,13 +73,13 @@ export default class Lock {
 
         /* Lock body after finishing transition */
         if (this.el_.checked) {
-          document.body.dataset.mdState = "lock"
+          this.lock_.dataset.mdState = "lock"
         }
       }, 400)
 
     /* Exiting search mode */
     } else {
-      document.body.dataset.mdState = ""
+      this.lock_.dataset.mdState = ""
 
       /* Scroll to former position, but wait for 100ms to prevent flashes on
          iOS. A short timeout seems to do the trick */
@@ -81,8 +94,8 @@ export default class Lock {
    * Reset locked state and page y-offset
    */
   reset() {
-    if (document.body.dataset.mdState === "lock")
+    if (this.lock_.dataset.mdState === "lock")
       window.scrollTo(0, this.offset_)
-    document.body.dataset.mdState = ""
+    this.lock_.dataset.mdState = ""
   }
 }

src/assets/javascripts/components/Material/Search/Result.jsx

@@ -32,13 +32,24 @@ export default class Result {
    * Perform search and update results on keyboard events
    *
    * @constructor
+   *
+   * @property {HTMLElement} el_ - Search result container
+   * @property {(Array<Object>|Function)} data_ - Raw document data
+   * @property {Object} docs_ - Indexed documents
+   * @property {HTMLElement} meta_ - Search meta information
+   * @property {HTMLElement} list_ - Search result list
+   * @property {Object} index_ - Search index
+   *
    * @param {(string|HTMLElement)} el - Selector or HTML element
-   * @param {(Array.<object>|Function)} data - Promise or array providing data
+   * @param {(Array<Object>|Function)} data - Function providing data or array
    */
   constructor(el, data) {
-    this.el_ = (typeof el === "string")
+    const ref = (typeof el === "string")
       ? document.querySelector(el)
       : el
+    if (!(ref instanceof HTMLElement))
+      throw new ReferenceError
+    this.el_ = ref
 
     /* Set data and create metadata and list elements */
     this.data_ = data
@@ -54,12 +65,20 @@ export default class Result {
     /* Inject created elements */
     this.el_.appendChild(this.meta_)
     this.el_.appendChild(this.list_)
+  }
 
-    /* Truncate a string after the given number of characters - this is not
+  /**
-       a reasonable approach, since the summaries kind of suck. It would be
+   * Truncate a string after the given number of character
-       better to create something more intelligent, highlighting the search
+   *
-       occurrences and making a better summary out of it */
+   * This is not a reasonable approach, since the summaries kind of suck. It
-    this.truncate_ = function(string, n) {
+   * would be better to create something more intelligent, highlighting the
+   * search occurrences and making a better summary out of it
+   *
+   * @param {string} string - String to be truncated
+   * @param {number} n - Number of characters
+   * @return {string} Truncated string
+   */
+  truncate_(string, n) {
     let i = n
     if (string.length > i) {
       while (string[i] !== " " && --i > 0);
@@ -67,7 +86,6 @@ export default class Result {
     }
     return string
   }
-  }
 
   /**
    * Update search results
@@ -90,7 +108,7 @@ export default class Result {
         })
 
         /* Index documents */
-        this.data_ = data.reduce((docs, doc) => {
+        this.docs_ = data.reduce((docs, doc) => {
           this.index_.add(doc)
           docs[doc.location] = doc
           return docs
@@ -104,15 +122,20 @@ export default class Result {
           : init(this.data_)
       }, 250)
 
-    /* Execute search on new input event after clearing current list */
+    /* Execute search on new input event */
     } else if (ev.type === "keyup") {
+      const target = ev.target
+      if (!(target instanceof HTMLInputElement))
+        throw new ReferenceError
+
+      /* Clear current list */
       while (this.list_.firstChild)
         this.list_.removeChild(this.list_.firstChild)
 
       /* Perform search on index and render documents */
-      const result = this.index_.search(ev.target.value)
+      const result = this.index_.search(target.value)
       result.forEach(item => {
-        const doc = this.data_[item.ref]
+        const doc = this.docs_[item.ref]
 
         /* Check if it's a anchor link on the current page */
         let [pathname] = doc.location.split("#")
@@ -143,6 +166,8 @@ export default class Result {
       Array.prototype.forEach.call(anchors, anchor => {
         anchor.addEventListener("click", ev2 => {
           const toggle = document.querySelector("[data-md-toggle=search]")
+          if (!(toggle instanceof HTMLInputElement))
+            throw new ReferenceError
           if (toggle.checked) {
             toggle.checked = false
             toggle.dispatchEvent(new CustomEvent("change"))

src/assets/javascripts/components/Material/Sidebar/Position.js

@@ -30,15 +30,25 @@ export default class Position {
    * Set sidebars to locked state and limit height to parent node
    *
    * @constructor
+   *
+   * @property {HTMLElement} el_ - Sidebar
+   * @property {HTMLElement} parent_ - Sidebar container
+   * @property {number} height_ - Current sidebar height
+   * @property {number} offset_ - Current page y-offset
+   *
    * @param {(string|HTMLElement)} el - Selector or HTML element
    */
   constructor(el) {
-    this.el_ = (typeof el === "string")
+    const ref = (typeof el === "string")
       ? document.querySelector(el)
       : el
+    if (!(ref instanceof HTMLElement) ||
+        !(ref.parentNode instanceof HTMLElement))
+      throw new ReferenceError
+    this.el_ = ref
 
     /* Initialize parent container and current height */
-    this.parent_ = this.el_.parentNode
+    this.parent_ = ref.parentNode
     this.height_ = 0
   }
 
@@ -65,15 +75,15 @@ export default class Position {
     const visible = window.innerHeight
 
     /* Calculate bounds of sidebar container  */
-    this.bounds_ = {
+    const bounds = {
       top: this.parent_.offsetTop,
       bottom: this.parent_.offsetTop + this.parent_.offsetHeight
     }
 
     /* Calculate new offset and height */
-    const height = visible - this.bounds_.top
+    const height = visible - bounds.top
                  - Math.max(0, this.offset_ - offset)
-                 - Math.max(0, offset + visible - this.bounds_.bottom)
+                 - Math.max(0, offset + visible - bounds.bottom)
 
     /* If height changed, update element */
     if (height !== this.height_)

src/assets/javascripts/components/Material/Source/Adapter/Abstract.js

@@ -29,16 +29,25 @@ import Cookies from "js-cookie"
 export default class Abstract {
 
   /**
-   * Retrieve source information
+   * Retrieve repository information
    *
    * @constructor
-   * @param {(string|HTMLElement)} el - Selector or HTML element
+   *
+   * @property {HTMLAnchorElement} el_ - Link to repository
+   * @property {string} base_ - API base URL
+   * @property {number} salt_ - Unique identifier
+   *
+   * @param {(string|HTMLAnchorElement)} el - Selector or HTML element
    */
   constructor(el) {
-    this.el_ = (typeof el === "string")
+    const ref = (typeof el === "string")
       ? document.querySelector(el)
       : el
 
+    if (!(ref instanceof HTMLAnchorElement))
+      throw new ReferenceError
+    this.el_ = ref
+
     /* Retrieve base URL */
     this.base_ = this.el_.href
     this.salt_ = this.hash_(this.base_)
@@ -47,7 +56,7 @@ export default class Abstract {
   /**
    * Retrieve data from Cookie or fetch from respective API
    *
-   * @return {Promise} Promise that returns an array of facts
+   * @return {Promise<Array<string>>} Promise that returns an array of facts
    */
   fetch() {
     return new Promise(resolve => {
@@ -70,7 +79,6 @@ export default class Abstract {
    * Abstract private function that fetches relevant repository information
    *
    * @abstract
-   * @return {Promise} Promise that provides the facts in an array
    */
   fetch_() {
     throw new Error("fetch_(): Not implemented")
@@ -79,15 +87,15 @@ export default class Abstract {
   /**
    * Format a number with suffix
    *
-   * @param {Number} number - Number to format
+   * @param {number} number - Number to format
-   * @return {Number} Formatted number
+   * @return {string} Formatted number
    */
   format_(number) {
     if (number > 10000)
       return `${(number / 1000).toFixed(0)}k`
     else if (number > 1000)
       return `${(number / 1000).toFixed(1)}k`
-    return number
+    return `${number}`
   }
 
   /**
@@ -96,7 +104,7 @@ export default class Abstract {
    * Taken from http://stackoverflow.com/a/7616484/1065584
    *
    * @param {string} str - Input string
-   * @return {string} Hashed string
+   * @return {number} Hashed string
    */
   hash_(str) {
     let hash = 0

src/assets/javascripts/components/Material/Source/Adapter/GitHub.js

@@ -29,10 +29,10 @@ import Abstract from "./Abstract"
 export default class GitHub extends Abstract {
 
   /**
-   * Retrieve source information from GitHub
+   * Retrieve repository information from GitHub
    *
    * @constructor
-   * @param {(string|HTMLElement)} el - Selector or HTML element
+   * @param {(string|HTMLAnchorElement)} el - Selector or HTML element
    */
   constructor(el) {
     super(el)
@@ -42,9 +42,9 @@ export default class GitHub extends Abstract {
   }
 
   /**
-   * Fetch relevant source information from GitHub
+   * Fetch relevant repository information from GitHub
    *
-   * @return {function} Promise returning an array of facts
+   * @return {Promise<Array<string>>} Promise returning an array of facts
    */
   fetch_() {
     return fetch(this.base_)

src/assets/javascripts/components/Material/Source/Repository.jsx

@@ -30,21 +30,27 @@ export default class Repository {
    * Render repository information
    *
    * @constructor
+   *
+   * @property {HTMLElement} el_ - Repository information
+   *
    * @param {(string|HTMLElement)} el - Selector or HTML element
    */
   constructor(el) {
-    this.el_ = (typeof el === "string")
+    const ref = (typeof el === "string")
       ? document.querySelector(el)
       : el
+    if (!(ref instanceof HTMLElement))
+      throw new ReferenceError
+    this.el_ = ref
   }
 
   /**
-   * Initialize the source repository
+   * Initialize the repository
    *
-   * @param {Array.<string>} facts - Facts to be rendered
+   * @param {Array<string>} facts - Facts to be rendered
    */
   initialize(facts) {
-    if (facts.length)
+    if (facts.length && this.el_.children.length)
       this.el_.children[this.el_.children.length - 1].appendChild(
         <ul class="md-source__facts">
           {facts.map(fact => <li class="md-source__fact">{fact}</li>)}

src/assets/stylesheets/layout/_source.scss

@@ -64,7 +64,7 @@
   line-height: 1.2;
   white-space: nowrap;
 
-  // Hovered source information
+  // Hovered source container
   &:hover {
     opacity: 0.7;
   }

src/partials/search.html

@@ -30,7 +30,7 @@
       <input type="text" class="md-search__input" name="query"
           placeholder="{{ lang.t('search.placeholder') }}"
           accesskey="s" autocapitalize="off" autocorrect="off"
-          autocomplete="off" spellcheck="false" />
+          autocomplete="off" spellcheck="false" data-md-component="query" />
       <label class="md-icon md-search__icon" for="search"></label>
     </form>
     <div class="md-search__output">