Convert docs to docsy

site/themes/docsy/assets/vendor/bootstrap/build/.eslintrc.json

@@ -0,0 +1,20 @@
+{
+  "env": {
+    "browser": false,
+    "node": true
+  },
+  "parserOptions": {
+    "sourceType": "script"
+  },
+  "extends": "../.eslintrc.json",
+  "rules": {
+    "consistent-return": "off",
+    "func-style": "off",
+    "no-console": "off",
+    "no-magic-numbers": "off",
+    "no-process-env": "off",
+    "no-process-exit": "off",
+    "no-sync": "off",
+    "spaced-comment": "off"
+  }
+}

site/themes/docsy/assets/vendor/bootstrap/build/.htmllintrc

@@ -0,0 +1,44 @@
+{
+  "attr-bans": ["align", "background", "bgcolor", "border", "frameborder", "longdesc", "marginwidth", "marginheight", "scrolling"],
+  "attr-name-style": false,
+  "attr-no-dup": true,
+  "attr-no-unsafe-char": true,
+  "attr-quote-style": "double",
+  "attr-req-value": true,
+  "attr-validate": false,
+  "class-no-dup": true,
+  "class-style": "none",
+  "doctype-first": true,
+  "doctype-html5": true,
+  "fig-req-figcaption": false,
+  "focusable-tabindex-style": true,
+  "head-req-title": true,
+  "head-valid-content-model": false,
+  "href-style": false,
+  "html-req-lang": true,
+  "html-valid-content-model": false,
+  "id-class-ignore-regex": "(onclick|content|[a-z]+([A-Z][a-z])+)",
+  "id-class-no-ad": true,
+  "id-class-style": false,
+  "id-no-dup": true,
+  "img-req-alt": "allownull",
+  "img-req-src": false,
+  "indent-style": "spaces",
+  "indent-width": 2,
+  "input-radio-req-name": false,
+  "input-req-label": false,
+  "label-req-for": true,
+  "lang-style": "case",
+  "line-no-trailing-whitespace": false,
+  "line-end-style": "lf",
+  "spec-char-escape": false,
+  "table-req-header": false,
+  "tag-bans": ["b", "i"],
+  "tag-close": true,
+  "tag-name-lowercase": true,
+  "tag-name-match": true,
+  "tag-self-close": false,
+  "text-ignore-regex": false,
+  "title-max-len": 70,
+  "title-no-dup": true
+}

site/themes/docsy/assets/vendor/bootstrap/build/build-plugins.js

@@ -0,0 +1,81 @@
+/*!
+ * Script to build our plugins to use them separately.
+ * Copyright 2018 The Bootstrap Authors
+ * Copyright 2018 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ */
+
+'use strict'
+
+const rollup  = require('rollup')
+const path    = require('path')
+const babel   = require('rollup-plugin-babel')
+const TEST    = process.env.NODE_ENV === 'test'
+
+const plugins = [
+  babel({
+    exclude: 'node_modules/**', // Only transpile our source code
+    externalHelpersWhitelist: [ // Include only required helpers
+      'defineProperties',
+      'createClass',
+      'inheritsLoose',
+      'defineProperty',
+      'objectSpread'
+    ]
+  })
+]
+
+const format = 'umd'
+const rootPath = !TEST ? '../js/dist/' : '../js/coverage/dist/'
+const bsPlugins = {
+  Alert: path.resolve(__dirname, '../js/src/alert.js'),
+  Button: path.resolve(__dirname, '../js/src/button.js'),
+  Carousel: path.resolve(__dirname, '../js/src/carousel.js'),
+  Collapse: path.resolve(__dirname, '../js/src/collapse.js'),
+  Dropdown: path.resolve(__dirname, '../js/src/dropdown.js'),
+  Modal: path.resolve(__dirname, '../js/src/modal.js'),
+  Popover: path.resolve(__dirname, '../js/src/popover.js'),
+  ScrollSpy: path.resolve(__dirname, '../js/src/scrollspy.js'),
+  Tab: path.resolve(__dirname, '../js/src/tab.js'),
+  Tooltip: path.resolve(__dirname, '../js/src/tooltip.js'),
+  Util: path.resolve(__dirname, '../js/src/util.js')
+}
+
+Object.keys(bsPlugins)
+  .forEach((pluginKey) => {
+    console.log(`Building ${pluginKey} plugin...`)
+
+    const external = ['jquery', 'popper.js']
+    const globals = {
+      jquery: 'jQuery', // Ensure we use jQuery which is always available even in noConflict mode
+      'popper.js': 'Popper'
+    }
+
+    // Do not bundle Util in plugins
+    if (pluginKey !== 'Util') {
+      external.push(bsPlugins.Util)
+      globals[bsPlugins.Util] = 'Util'
+    }
+
+    // Do not bundle Tooltip in Popover
+    if (pluginKey === 'Popover') {
+      external.push(bsPlugins.Tooltip)
+      globals[bsPlugins.Tooltip] = 'Tooltip'
+    }
+
+    rollup.rollup({
+      input: bsPlugins[pluginKey],
+      plugins,
+      external
+    }).then((bundle) => {
+      bundle.write({
+        format,
+        name: pluginKey,
+        sourcemap: true,
+        globals,
+        file: path.resolve(__dirname, `${rootPath}${pluginKey.toLowerCase()}.js`)
+      })
+        .then(() => console.log(`Building ${pluginKey} plugin... Done !`))
+        .catch((err) => console.error(`${pluginKey}: ${err}`))
+    })
+  })

site/themes/docsy/assets/vendor/bootstrap/build/change-version.js

@@ -0,0 +1,104 @@
+#!/usr/bin/env node
+
+/*!
+ * Script to update version number references in the project.
+ * Copyright 2017-2018 The Bootstrap Authors
+ * Copyright 2017-2018 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ */
+
+'use strict'
+
+const fs = require('fs')
+const path = require('path')
+const sh = require('shelljs')
+
+sh.config.fatal = true
+
+// Blame TC39... https://github.com/benjamingr/RegExp.escape/issues/37
+function regExpQuote(string) {
+  return string.replace(/[-\\^$*+?.()|[\]{}]/g, '\\$&')
+}
+
+function regExpQuoteReplacement(string) {
+  return string.replace(/[$]/g, '$$')
+}
+
+const DRY_RUN = false
+
+function walkAsync(directory, excludedDirectories, fileCallback, errback) {
+  if (excludedDirectories.has(path.parse(directory).base)) {
+    return
+  }
+  fs.readdir(directory, (err, names) => {
+    if (err) {
+      errback(err)
+      return
+    }
+    names.forEach((name) => {
+      const filepath = path.join(directory, name)
+      fs.lstat(filepath, (err, stats) => {
+        if (err) {
+          process.nextTick(errback, err)
+          return
+        }
+        if (stats.isDirectory()) {
+          process.nextTick(walkAsync, filepath, excludedDirectories, fileCallback, errback)
+        } else if (stats.isFile()) {
+          process.nextTick(fileCallback, filepath)
+        }
+      })
+    })
+  })
+}
+
+function replaceRecursively(directory, excludedDirectories, allowedExtensions, original, replacement) {
+  original = new RegExp(regExpQuote(original), 'g')
+  replacement = regExpQuoteReplacement(replacement)
+  const updateFile = DRY_RUN ? (filepath) => {
+    if (allowedExtensions.has(path.parse(filepath).ext)) {
+      console.log(`FILE: ${filepath}`)
+    } else {
+      console.log(`EXCLUDED:${filepath}`)
+    }
+  } : (filepath) => {
+    if (allowedExtensions.has(path.parse(filepath).ext)) {
+      sh.sed('-i', original, replacement, filepath)
+    }
+  }
+  walkAsync(directory, excludedDirectories, updateFile, (err) => {
+    console.error('ERROR while traversing directory!:')
+    console.error(err)
+    process.exit(1)
+  })
+}
+
+function main(args) {
+  if (args.length !== 2) {
+    console.error('USAGE: change-version old_version new_version')
+    console.error('Got arguments:', args)
+    process.exit(1)
+  }
+  const oldVersion = args[0]
+  const newVersion = args[1]
+  const EXCLUDED_DIRS = new Set([
+    '.git',
+    'node_modules',
+    'vendor'
+  ])
+  const INCLUDED_EXTENSIONS = new Set([
+    // This extension whitelist is how we avoid modifying binary files
+    '',
+    '.css',
+    '.html',
+    '.js',
+    '.json',
+    '.md',
+    '.scss',
+    '.txt',
+    '.yml'
+  ])
+  replaceRecursively('.', EXCLUDED_DIRS, INCLUDED_EXTENSIONS, oldVersion, newVersion)
+}
+
+main(process.argv.slice(2))

site/themes/docsy/assets/vendor/bootstrap/build/generate-sri.js

@@ -0,0 +1,60 @@
+#!/usr/bin/env node
+
+/*!
+ * Script to generate SRI hashes for use in our docs.
+ * Remember to use the same vendor files as the CDN ones,
+ * otherwise the hashes won't match!
+ *
+ * Copyright 2017-2018 The Bootstrap Authors
+ * Copyright 2017-2018 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ */
+
+'use strict'
+
+const fs = require('fs')
+const path = require('path')
+const sriToolbox = require('sri-toolbox')
+const sh = require('shelljs')
+
+sh.config.fatal = true
+
+const configFile = path.join(__dirname, '../_config.yml')
+
+// Array of objects which holds the files to generate SRI hashes for.
+// `file` is the path from the root folder
+// `configPropertyName` is the _config.yml variable's name of the file
+const files = [
+  {
+    file: 'dist/css/bootstrap.min.css',
+    configPropertyName: 'css_hash'
+  },
+  {
+    file: 'dist/js/bootstrap.min.js',
+    configPropertyName: 'js_hash'
+  },
+  {
+    file: 'site/docs/4.1/assets/js/vendor/jquery-slim.min.js',
+    configPropertyName: 'jquery_hash'
+  },
+  {
+    file: 'site/docs/4.1/assets/js/vendor/popper.min.js',
+    configPropertyName: 'popper_hash'
+  }
+]
+
+files.forEach((file) => {
+  fs.readFile(file.file, 'utf8', (err, data) => {
+    if (err) {
+      throw err
+    }
+
+    const integrity = sriToolbox.generate({
+      algorithms: ['sha384']
+    }, data)
+
+    console.log(`${file.configPropertyName}: ${integrity}`)
+
+    sh.sed('-i', new RegExp(`(\\s${file.configPropertyName}:\\s+"|')(\\S+)("|')`), `$1${integrity}$3`, configFile)
+  })
+})

site/themes/docsy/assets/vendor/bootstrap/build/lint-vars.js

@@ -0,0 +1,82 @@
+#!/usr/bin/env node
+
+/*!
+ * Script to find unused Sass variables.
+ * Copyright 2017-2018 The Bootstrap Authors
+ * Copyright 2017-2018 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ */
+
+'use strict'
+
+const fs = require('fs')
+const path = require('path')
+const glob = require('glob')
+
+// Blame TC39... https://github.com/benjamingr/RegExp.escape/issues/37
+function regExpQuote(str) {
+  return str.replace(/[-\\^$*+?.()|[\]{}]/g, '\\$&')
+}
+
+let globalSuccess = true
+
+function findUnusedVars(dir) {
+  if (!(fs.existsSync(dir) && fs.statSync(dir).isDirectory())) {
+    console.log(`"${dir}": Not a valid directory!`)
+    process.exit(1)
+  }
+
+  console.log(`Finding unused variables in "${dir}"...`)
+
+  // A variable to handle success/failure message in this function
+  let unusedVarsFound = false
+
+  // Array of all Sass files' content
+  const sassFiles = glob.sync(path.join(dir, '**/*.scss'))
+  // String of all Sass files' content
+  let sassFilesString = ''
+
+  sassFiles.forEach((file) => {
+    sassFilesString += fs.readFileSync(file, 'utf8')
+  })
+
+  // Array of all Sass variables
+  const variables = sassFilesString.match(/(^\$[a-zA-Z0-9_-]+[^:])/gm)
+
+  console.log(`Found ${variables.length} total variables.`)
+
+  // Loop through each variable
+  variables.forEach((variable) => {
+    const re = new RegExp(regExpQuote(variable), 'g')
+    const count = (sassFilesString.match(re) || []).length
+
+    if (count === 1) {
+      console.log(`Variable "${variable}" is not being used.`)
+      unusedVarsFound = true
+      globalSuccess = false
+    }
+  })
+
+  if (unusedVarsFound === false) {
+    console.log(`No unused variables found in "${dir}".`)
+  }
+}
+
+function main(args) {
+  if (args.length < 1) {
+    console.log('Wrong arguments!')
+    console.log('Usage: lint-vars.js folder [, folder2...]')
+    process.exit(1)
+  }
+
+  args.forEach((arg) => {
+    findUnusedVars(arg)
+  })
+
+  if (globalSuccess === false) {
+    process.exit(1)
+  }
+}
+
+// The first and second args are: path/to/node script.js
+main(process.argv.slice(2))

site/themes/docsy/assets/vendor/bootstrap/build/postcss.config.js

@@ -0,0 +1,14 @@
+'use strict'
+
+module.exports = (ctx) => ({
+  map: ctx.file.dirname.includes('examples') ? false : {
+    inline: false,
+    annotation: true,
+    sourcesContent: true
+  },
+  plugins: {
+    autoprefixer: {
+      cascade: false
+    }
+  }
+})

site/themes/docsy/assets/vendor/bootstrap/build/rollup.config.js

@@ -0,0 +1,53 @@
+'use strict'
+
+const path    = require('path')
+const babel   = require('rollup-plugin-babel')
+const resolve = require('rollup-plugin-node-resolve')
+
+const pkg     = require(path.resolve(__dirname, '../package.json'))
+const BUNDLE  = process.env.BUNDLE === 'true'
+const year    = new Date().getFullYear()
+
+let fileDest  = 'bootstrap.js'
+const external = ['jquery', 'popper.js']
+const plugins = [
+  babel({
+    exclude: 'node_modules/**', // Only transpile our source code
+    externalHelpersWhitelist: [ // Include only required helpers
+      'defineProperties',
+      'createClass',
+      'inheritsLoose',
+      'defineProperty',
+      'objectSpread'
+    ]
+  })
+]
+const globals = {
+  jquery: 'jQuery', // Ensure we use jQuery which is always available even in noConflict mode
+  'popper.js': 'Popper'
+}
+
+if (BUNDLE) {
+  fileDest = 'bootstrap.bundle.js'
+  // Remove last entry in external array to bundle Popper
+  external.pop()
+  delete globals['popper.js']
+  plugins.push(resolve())
+}
+
+module.exports = {
+  input: path.resolve(__dirname, '../js/src/index.js'),
+  output: {
+    banner: `/*!
+  * Bootstrap v${pkg.version} (${pkg.homepage})
+  * Copyright 2011-${year} ${pkg.author}
+  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+  */`,
+    file: path.resolve(__dirname, `../dist/js/${fileDest}`),
+    format: 'umd',
+    globals,
+    name: 'bootstrap'
+  },
+  external,
+  plugins
+}

site/themes/docsy/assets/vendor/bootstrap/build/sauce_browsers.json

@@ -0,0 +1,65 @@
+[
+  {
+    "browserName": "safari",
+    "platform": "OS X 10.11",
+    "version": "latest"
+  },
+  {
+    "browserName": "chrome",
+    "platform": "OS X 10.11",
+    "version": "latest"
+  },
+  {
+    "browserName": "firefox",
+    "platform": "OS X 10.11",
+    "version": "latest"
+  },
+  {
+    "browserName": "MicrosoftEdge",
+    "platform": "Windows 10",
+    "version": "latest"
+  },
+  {
+    "browserName": "internet explorer",
+    "version": "11",
+    "platform": "Windows 8.1"
+  },
+  {
+    "browserName": "internet explorer",
+    "version": "10",
+    "platform": "Windows 8"
+  },
+  {
+    "browserName": "chrome",
+    "platform": "Windows 10",
+    "version": "latest"
+  },
+  {
+    "browserName": "firefox",
+    "platform": "Windows 10",
+    "version": "latest"
+  },
+  {
+    "browserName": "iphone",
+    "deviceName": "iPhone Simulator",
+    "platformName": "OS X 10.11",
+    "version": "9.3"
+  },
+  {
+    "browserName": "chrome",
+    "platform": "Linux",
+    "version": "latest"
+  },
+  {
+    "browserName": "firefox",
+    "platform": "Linux",
+    "version": "latest"
+  },
+  {
+    "platform": "Linux",
+    "browserName": "android",
+    "deviceName": "Android Emulator",
+    "version": "latest",
+    "deviceType": "phone"
+  }
+]

site/themes/docsy/assets/vendor/bootstrap/build/saucelabs-unit-test.js

@@ -0,0 +1,116 @@
+/*!
+ * Script to run our Sauce Labs tests.
+ * Copyright 2017-2018 The Bootstrap Authors
+ * Copyright 2017-2018 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ */
+
+/*
+Docs: https://wiki.saucelabs.com/display/DOCS/Platform+Configurator
+Mac Opera is not currently supported by Sauce Labs
+Win Opera 15+ is not currently supported by Sauce Labs
+iOS Chrome is not currently supported by Sauce Labs
+*/
+
+'use strict'
+
+const path = require('path')
+const JSUnitSaucelabs = require('jsunitsaucelabs')
+
+const jsUnitSaucelabs = new JSUnitSaucelabs({
+  username: process.env.SAUCE_USERNAME,
+  password: process.env.SAUCE_ACCESS_KEY,
+  build: process.env.TRAVIS_JOB_ID
+})
+
+const testURL = 'http://localhost:3000/js/tests/index.html?hidepassed'
+const browsersFile = require(path.resolve(__dirname, './sauce_browsers.json'))
+const errorMessages = [
+  'Test exceeded maximum duration',
+  'Test exceeded maximum duration after 180 seconds'
+]
+let jobsDone = 0
+let jobsSucceeded = 0
+
+const waitingCallback = (error, body, id) => {
+  if (error) {
+    console.error(error)
+    process.exit(1)
+  }
+
+  if (typeof body !== 'undefined') {
+    if (!body.completed) {
+      setTimeout(() => {
+        jsUnitSaucelabs.getStatus(id, (error, body) => {
+          waitingCallback(error, body, id)
+        })
+      }, 2000)
+    } else {
+      const test = body['js tests'][0]
+      const platform = test.platform.join(', ')
+      let passed = false
+      let errorStr = false
+
+      if (test.result !== null) {
+        if (typeof test.result === 'string' && errorMessages.includes(test.result)) {
+          errorStr = test.result
+        } else {
+          passed = test.result.total === test.result.passed
+        }
+      }
+
+      console.log(`Tested ${testURL}`)
+      console.log(`Platform: ${platform}`)
+      console.log(`Passed: ${passed}`)
+      console.log(`URL: ${test.url}\n`)
+
+      if (errorStr) {
+        console.error(`${platform}: ${errorStr}`)
+      }
+
+      if (passed) {
+        jobsSucceeded++
+      }
+      jobsDone++
+
+      // Exit
+      if (jobsDone === browsersFile.length - 1) {
+        jsUnitSaucelabs.stop()
+        if (jobsDone > jobsSucceeded) {
+          const failedTests = jobsDone - jobsSucceeded
+          throw new Error(`${failedTests} test${failedTests > 1 ? 's' : ''} failed.`)
+        }
+
+        console.log('All tests passed')
+        process.exit(0)
+      }
+    }
+  }
+}
+
+jsUnitSaucelabs.on('tunnelCreated', () => {
+  browsersFile.forEach((tmpBrowser) => {
+    const browsersPlatform = typeof tmpBrowser.platform === 'undefined' ? tmpBrowser.platformName : tmpBrowser.platform
+    const browsersArray = [browsersPlatform, tmpBrowser.browserName, tmpBrowser.version]
+
+    jsUnitSaucelabs.start([browsersArray], testURL, 'qunit', (error, success) => {
+      if (typeof success !== 'undefined') {
+        const taskIds = success['js tests']
+
+        if (!taskIds || taskIds.length === 0) {
+          throw new Error('Error starting tests through Sauce Labs API')
+        }
+
+        taskIds.forEach((id) => {
+          jsUnitSaucelabs.getStatus(id, (error, body) => {
+            waitingCallback(error, body, id)
+          })
+        })
+      } else {
+        console.error(error)
+      }
+    })
+  })
+})
+
+jsUnitSaucelabs.initTunnel()

site/themes/docsy/assets/vendor/bootstrap/build/ship.sh

@@ -0,0 +1,70 @@
+#!/usr/bin/env bash
+#
+# Usage
+# ---------------
+# 1. Clone second version of Bootstrap in sibling directory named `bs-docs`.
+# 2. Within `bs-docs` copy, switch to `gh-pages` branch.
+# 3. Pull latest, re-bundle, re-npm.
+# 4. Run script.
+
+red=$'\e[1;31m'
+green=$'\e[1;32m'
+#blue=$'\e[1;34m'
+magenta=$'\e[1;35m'
+#cyan=$'\e[1;36m'
+end=$'\e[0m'
+
+# Get current version from package.json
+current_version=$(node -p "require('./package.json').version")
+
+if [[ $# -lt 1 ]]; then
+  printf "\n%s⚠️  Shipping aborted. You must specify a version.\n%s" $red $end
+  exit 1
+fi
+
+# Pulling latest changes, just to be sure
+printf "\n%s=======================================================%s" $magenta $end
+printf "\n%sPulling latest changes...%s" $magenta $end
+printf "\n%s=======================================================\n\n%s" $magenta $end
+git pull origin v4-dev
+
+# Update version number
+printf "\n%s=======================================================%s" $magenta $end
+printf "\n%sUpdating version number...%s" $magenta $end
+printf "\n%s=======================================================\n%s" $magenta $end
+npm run release-version "$current_version" "$1"
+
+# Compile latest CSS and JS
+printf "\n%s=======================================================%s" $magenta $end
+printf "\n%sCompile latest CSS and JS...%s" $magenta $end
+printf "\n%s=======================================================\n%s" $magenta $end
+npm run dist
+
+# Generate the SRI hashes
+printf "\n%s=======================================================%s" $magenta $end
+printf "\n%sGenerate the SRI hashes...%s" $magenta $end
+printf "\n%s=======================================================\n%s" $magenta $end
+npm run release-sri
+
+# Compress the dist files
+printf "\n%s=======================================================%s" $magenta $end
+printf "\n%sCompressing the dist files...%s" $magenta $end
+printf "\n%s=======================================================\n%s" $magenta $end
+npm run release-zip
+
+# Compile the docs
+printf "\n%s=======================================================%s" $magenta $end
+printf "\n%sCompile hosted documentation...%s" $magenta $end
+printf "\n%s=======================================================\n%s" $magenta $end
+npm run docs-github
+
+# Copy the contents of the built docs site over to `bs-docs` repo
+printf "\n%s=======================================================%s" $magenta $end
+printf "\n%sCopy it over...%s" $magenta $end
+printf "\n%s=======================================================\n%s" $magenta $end
+cp -rf _gh_pages/. ../bs-docs/
+printf "\nDone!\n"
+
+printf "\n%s=======================================================%s" $green $end
+printf "\n%sSuccess, $1 is ready to review and publish.%s" $green $end
+printf "\n%s=======================================================\n\n%s" $green $end

site/themes/docsy/assets/vendor/bootstrap/build/vnu-jar.js

@@ -0,0 +1,68 @@
+#!/usr/bin/env node
+
+/*!
+ * Script to run vnu-jar if Java is available.
+ * Copyright 2017-2018 The Bootstrap Authors
+ * Copyright 2017-2018 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ */
+
+'use strict'
+
+const childProcess = require('child_process')
+const vnu = require('vnu-jar')
+
+childProcess.exec('java -version', (error, stdout, stderr) => {
+  if (error) {
+    console.error('Skipping vnu-jar test; Java is missing.')
+    return
+  }
+
+  const is32bitJava = !stderr.match(/64-Bit/)
+
+  // vnu-jar accepts multiple ignores joined with a `|`.
+  // Also note that the ignores are regular expressions.
+  const ignores = [
+    // "autocomplete" is included in <button> and checkboxes and radio <input>s due to
+    // Firefox's non-standard autocomplete behavior - see https://bugzilla.mozilla.org/show_bug.cgi?id=654072
+    'Attribute “autocomplete” is only allowed when the input type is.*',
+    'Attribute “autocomplete” not allowed on element “button” at this point.',
+    // We use holder.js with `data-src` and no `src` to avoid 404 errors;
+    // we could work around this, but I'm not sure it's worth it.
+    'Element “img” is missing required attribute “src”.',
+    // Markup used in Components → Forms → Layout → Form grid → Horizontal form is currently invalid,
+    // but used this way due to lack of support for flexbox layout on <fieldset> element in most browsers
+    'Element “legend” not allowed as child of element “div” in this context.*',
+    // Content → Reboot uses various date/time inputs as a visual example.
+    // Documentation does not rely on them being usable.
+    'The “date” input type is not supported in all browsers.*',
+    'The “time” input type is not supported in all browsers.*',
+    // IE11 doesn't recognise <main> / give the element an implicit "main" landmark.
+    // Explicit role="main" is redundant for other modern browsers, but still valid.
+    'The “main” role is unnecessary for element “main”.',
+    // Ignore the wrong lanuage code warnings for now; they happen randomly.
+    'This document appears to be written in.*'
+  ].join('|')
+
+  const args = [
+    '-jar',
+    vnu,
+    '--asciiquotes',
+    '--skip-non-html',
+    '--Werror',
+    `--filterpattern "${ignores}"`,
+    '_gh_pages/',
+    'js/tests/'
+  ]
+
+  // For the 32-bit Java we need to pass `-Xss512k`
+  if (is32bitJava) {
+    args.splice(0, 0, '-Xss512k')
+  }
+
+  return childProcess.spawn('java', args, {
+    shell: true,
+    stdio: 'inherit'
+  })
+    .on('exit', process.exit)
+})

site/themes/docsy/assets/vendor/bootstrap/build/workbox.config.json

@@ -0,0 +1,8 @@
+{
+  "globDirectory": "./",
+  "globPatterns": [
+    "_gh_pages/**/*.{html,css,js,json,png,svg}"
+  ],
+  "swSrc": "./site/sw.js",
+  "swDest": "./_gh_pages/sw.js"
+}

site/themes/docsy/assets/vendor/bootstrap/build/workbox.js

@@ -0,0 +1,58 @@
+/*!
+ * Script to generate our docs service worker.
+ * Copyright 2017-2018 The Bootstrap Authors
+ * Copyright 2017-2018 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ */
+
+'use strict'
+
+const fs = require('fs')
+const path = require('path')
+const swBuild = require('workbox-build')
+const config = require('./workbox.config.json')
+
+const buildPrefix = '_gh_pages/'
+
+const workboxSWSrcPath = require.resolve('workbox-sw')
+const wbFileName = path.basename(workboxSWSrcPath)
+const workboxSWDestPath = `${buildPrefix}docs/4.1/assets/js/vendor/${wbFileName}`
+const workboxSWSrcMapPath = `${workboxSWSrcPath}.map`
+const workboxSWDestMapPath = `${workboxSWDestPath}.map`
+
+fs.createReadStream(workboxSWSrcPath).pipe(fs.createWriteStream(workboxSWDestPath))
+fs.createReadStream(workboxSWSrcMapPath).pipe(fs.createWriteStream(workboxSWDestMapPath))
+
+const updateUrl = (manifestEntries) => {
+  const manifest = manifestEntries.map((entry) => {
+    if (entry.url.startsWith(buildPrefix)) {
+      const regex = new RegExp(buildPrefix, 'g')
+      entry.url = entry.url.replace(regex, '')
+    }
+    return entry
+  })
+  return {
+    manifest,
+    warnings: []
+  }
+}
+
+config.manifestTransforms = [updateUrl]
+
+swBuild.injectManifest(config).then(({
+  count,
+  size
+}) => {
+  const wbSwRegex = /{fileName}/g
+  fs.readFile(config.swDest, 'utf8', (err, data) => {
+    if (err) {
+      throw err
+    }
+    const swFileContents = data.replace(wbSwRegex, wbFileName)
+    fs.writeFile(config.swDest, swFileContents, () => {
+      console.log(`Pre-cache Manifest generated. Pre-cached ${count} files, totalling ${size} bytes.`)
+    })
+  })
+}).catch((error) => {
+  console.error(`Something went wrong: ${error}`)
+})