feat: major refactor, cleanup and jest tests

.babelrc

@@ -1,8 +1,3 @@
 {
-  "presets": ["@babel/preset-env"],
+  "presets": ["@babel/preset-env"]
-  "env": {
-    "test": {
-      "plugins": ["istanbul"]
-    }
-  }
 }

.eslintrc

@@ -0,0 +1,13 @@
+{
+  "root": true,
+  "parserOptions": {
+    "parser": "babel-eslint",
+    "sourceType": "module"
+  },
+  "extends": [
+    "@nuxtjs"
+  ],
+  "globals": {
+    "Vue": "readable"
+  }
+}

.gitignore

@@ -38,3 +38,7 @@ jspm_packages
 
 # built code
 lib
+
+# yarn
+yarn.lock
+yarn-error.log

README.md

@@ -847,4 +847,6 @@ If this were not the case, you would have to instruct Babel to convert `default`
 
 # Examples
 
-To run the examples; clone this repository & run `npm install` in the root directory, and then run `npm run dev`. Head to http://localhost:8080.
+To run the examples; clone this repository & run `cd examples && npm install` in the root directory, and then run `npm run start`. Head to http://localhost:8080.
+
+If you would like to help to develop vue-meta then run `npm install` both in the root and examples dir and run `npm run dev`

examples/.babelrc

@@ -0,0 +1,3 @@
+{
+  "presets": ["@babel/preset-env"]
+}

examples/package.json

@@ -0,0 +1,39 @@
+{
+  "name": "vue-meta-examples",
+  "version": "1.0.0",
+  "description": "Examples for vue-meta",
+  "main": "server.js",
+  "private": true,
+  "scripts": {
+    "dev": "cross-env NODE_ENV=dev babel-node server.js",
+    "start": "babel-node server.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/nuxt/vue-meta.git"
+  },
+  "author": "",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/nuxt/vue-meta/issues"
+  },
+  "homepage": "https://github.com/nuxt/vue-meta#readme",
+  "devDependencies": {
+    "@babel/core": "^7.2.2",
+    "@babel/node": "^7.2.2",
+    "@babel/preset-env": "^7.3.1",
+    "babel-loader": "^8.0.5",
+    "cross-env": "^5.2.0",
+    "express": "^4.16.4",
+    "express-urlrewrite": "^1.2.0",
+    "vue": "^2.6.3",
+    "vue-loader": "^15.6.2",
+    "vue-meta": "^1.5.8",
+    "vue-router": "^3.0.2",
+    "vue-template-compiler": "^2.6.3",
+    "vuex": "^3.1.0",
+    "webpack": "^4.26.1",
+    "webpack-dev-server": "^3.1.10",
+    "webpackbar": "^3.1.5"
+  }
+}

examples/server.js

@@ -24,7 +24,9 @@ fs.readdirSync(__dirname).forEach(file => {
 
 app.use(express.static(__dirname))
 
+const host = process.env.HOST || 'localhost'
 const port = process.env.PORT || 8080
-module.exports = app.listen(port, () => {
+
-  console.log(`Server listening on http://localhost:${port}, Ctrl+C to stop`)
+module.exports = app.listen(port, host, () => {
+  console.log(`Server listening on http://${host}:${port}, Ctrl+C to stop`)
 })

examples/ssr.js

@@ -1,6 +1,6 @@
 const Vue = require('vue')
 const renderer = require('vue-server-renderer').createRenderer()
-const VueMeta = require('../')
+const VueMeta = require(process.env.NODE_ENV === 'development' ? '../' : 'vue-meta')
 
 Vue.use(VueMeta, {
   tagIDKeyName: 'hid'

examples/ssr.tagid.js

@@ -1,6 +1,6 @@
 const Vue = require('vue')
 const renderer = require('vue-server-renderer').createRenderer()
-const VueMeta = require('../')
+const VueMeta = require(process.env.NODE_ENV === 'development' ? '../' : 'vue-meta')
 
 Vue.use(VueMeta, {
   tagIDKeyName: 'hid'

examples/vue-router/app.js

@@ -1,4 +1,3 @@
-import assign from 'object-assign'
 import Vue from 'vue'
 import VueMeta from 'vue-meta'
 import Router from 'vue-router'
@@ -41,6 +40,7 @@ const router = new Router({
 })
 
 const App = {
+  router,
   template: `
     <div id="app">
       <h1>vue-router</h1>
@@ -54,6 +54,6 @@ const App = {
   `
 }
 
-const app = new Vue(assign(App, { router }))
+const app = new Vue(App)
 
 app.$mount('#app')

examples/vuex-async/app.js

@@ -1,9 +1,9 @@
-import assign from 'object-assign'
 import Vue from 'vue'
 import store from './store'
 import router from './router'
 import App from './App.vue'
 
-const app = new Vue(assign(App, { router, store }))
+App.router = router
+App.store = store
 
-app.$mount('#app')
+new Vue(App).$mount('#app')

examples/vuex/app.js

@@ -1,9 +1,9 @@
-import assign from 'object-assign'
 import Vue from 'vue'
 import store from './store'
 import router from './router'
 import App from './App.vue'
 
-const app = new Vue(assign(App, { router, store }))
+App.router = router
+App.store = store
 
-app.$mount('#app')
+new Vue(App).$mount('#app')

examples/webpack.config.babel.js

@@ -1,6 +1,8 @@
 import fs from 'fs'
 import path from 'path'
 import webpack from 'webpack'
+import WebpackBar from 'webpackbar'
+import VueLoaderPlugin from 'vue-loader/lib/plugin'
 
 export default {
   devtool: 'inline-source-map',
@@ -28,7 +30,7 @@ export default {
   resolve: {
     alias: {
       'vue': 'vue/dist/vue.js',
-      'vue-meta': path.join(__dirname, '..', 'src')
+      'vue-meta': process.env.NODE_ENV === 'development' ? path.join(__dirname, '..', 'src') : 'vue-meta'
     }
   },
   // Expose __dirname to allow automatically setting basename.
@@ -37,7 +39,8 @@ export default {
     __dirname: true
   },
   plugins: [
-    // new webpack.optimize.CommonsChunkPlugin('shared.js'),
+    new WebpackBar(),
+    new VueLoaderPlugin(),
     new webpack.DefinePlugin({
       'process.env.NODE_ENV': JSON.stringify(process.env.NODE_ENV || 'development')
     })

jest.config.js

@@ -0,0 +1,47 @@
+module.exports = {
+  testEnvironment: 'node',
+
+  expand: true,
+
+  forceExit: false,
+
+  // https://github.com/facebook/jest/pull/6747 fix warning here
+  // But its performance overhead is pretty bad (30+%).
+  // detectOpenHandles: true
+
+  setupFilesAfterEnv: ['./test/utils/setup'],
+
+  coverageDirectory: './coverage',
+
+  collectCoverageFrom: [
+    '**/src/**/*.js'
+  ],
+
+  coveragePathIgnorePatterns: [
+    'node_modules'
+  ],
+
+  testPathIgnorePatterns: [
+    'node_modules',
+    'old'
+  ],
+
+  transformIgnorePatterns: [
+    'node_modules'
+  ],
+
+  transform: {
+    '^.+\\.js$': 'babel-jest',
+    '.*\\.(vue)$': 'vue-jest'
+  },
+
+  moduleFileExtensions: [
+    'ts',
+    'js',
+    'json'
+  ],
+
+  reporters: [
+    'default'
+  ].concat(process.env.JEST_JUNIT_OUTPUT ? ['jest-junit'] : [])
+}

karma.conf.babel.js

@@ -1,33 +0,0 @@
-import webpackConfig from './examples/webpack.config.babel'
-
-delete webpackConfig.entry
-
-export default (config) => {
-  config.set({
-    browsers: ['PhantomJS'],
-    frameworks: ['mocha', 'chai'],
-    reporters: ['mocha', 'coverage'],
-    files: ['test/index.js'],
-    preprocessors: {
-      'test/index.js': ['webpack', 'sourcemap']
-    },
-    coverageReporter: {
-      reporters: [
-        { type: 'lcov' },
-        { type: 'text' }
-      ],
-      includeAllSources: true,
-      dir: 'coverage',
-      subdir: '.'
-    },
-    webpack: webpackConfig,
-    webpackMiddleware: {
-      noInfo: true
-    },
-    mochaReporter: {
-      showDiff: true,
-      output: 'full'
-    },
-    singleRun: true
-  })
-}

karma.conf.js

@@ -1,2 +0,0 @@
-require('@babel/register')
-module.exports = require('./karma.conf.babel').default

package.json

@@ -1,87 +1,73 @@
 {
   "name": "vue-meta",
-  "description": "manage page meta info in Vue 2.0 server-rendered apps",
+  "description": "Manage page meta info in Vue 2.0 server-rendered apps",
   "version": "1.5.8",
   "author": "Declan de Wet <declandewet@me.com>",
-  "bugs": "https://github.com/declandewet/vue-meta/issues",
+  "bugs": "https://github.com/nuxt/vue-meta/issues",
   "scripts": {
-    "build": "rollup -c",
+    "build": "rimraf lib && rollup -c",
     "codecov": "codecov",
     "deploy": "npm version",
-    "dev": "babel-node examples/server.js",
+    "dev": "cd examples && npm run dev && cd ..",
-    "lint": "standard --verbose | snazzy",
+    "lint": "eslint src test",
-    "minify": "uglifyjs lib/vue-meta.js -cm --comments -o lib/vue-meta.min.js",
-    "postbuild": "npm run minify",
     "postdeploy": "git push origin master --follow-tags && npm run release",
     "postversion": "npm run update-cdn && git add . && git commit -m \":ship: CDN update\"",
-    "prebuild": "rimraf lib",
     "predeploy": "git checkout master && git pull -r",
     "prerelease": "npm run build",
-    "pretest": "npm run lint",
     "preversion": "npm run toc",
     "release": "npm publish",
-    "test": "cross-env NODE_ENV=test karma start karma.conf.js",
+    "test": "jest",
     "toc": "doctoc README.md --title '# Table of Contents'",
     "update-cdn": "babel-node scripts/update-cdn.js"
   },
   "dependencies": {
     "deepmerge": "^3.0.0",
     "lodash.isplainobject": "^4.0.6",
-    "lodash.uniqueid": "^4.0.1",
+    "lodash.uniqueid": "^4.0.1"
-    "object-assign": "^4.1.1"
   },
   "devDependencies": {
-    "@babel/cli": "^7.1.5",
     "@babel/core": "^7.1.6",
-    "@babel/node": "^7.0.0",
+    "@babel/node": "^7.2.2",
     "@babel/preset-env": "^7.1.6",
-    "@babel/register": "^7.0.0",
+    "@nuxtjs/eslint-config": "^0.0.1",
+    "@vue/server-test-utils": "^1.0.0-beta.29",
+    "@vue/test-utils": "^1.0.0-beta.29",
+    "babel-core": "^7.0.0-bridge",
+    "babel-eslint": "^10.0.1",
+    "babel-jest": "^24.1.0",
     "babel-loader": "^8.0.4",
-    "babel-plugin-istanbul": "^5.1.0",
-    "chai": "^4.2.0",
     "codecov": "^3.1.0",
-    "cross-env": "^5.2.0",
-    "css-loader": "^2.0.0",
     "doctoc": "^1.4.0",
-    "es6-promise": "^4.2.5",
+    "eslint": "^5.13.0",
-    "express": "^4.16.4",
+    "eslint-config-standard": "^12.0.0",
-    "express-urlrewrite": "^1.2.0",
+    "eslint-plugin-import": "^2.16.0",
-    "file-loader": "^3.0.0",
+    "eslint-plugin-jest": "^22.2.2",
-    "karma": "^3.1.1",
+    "eslint-plugin-node": "^8.0.1",
-    "karma-chai": "^0.1.0",
+    "eslint-plugin-promise": "^4.0.1",
-    "karma-coverage": "^1.1.2",
+    "eslint-plugin-standard": "^4.0.0",
-    "karma-mocha": "^1.3.0",
+    "eslint-plugin-vue": "^5.1.0",
-    "karma-mocha-reporter": "^2.2.5",
+    "jest": "^24.1.0",
-    "karma-phantomjs-launcher": "^1.0.4",
+    "jsdom": "^13.2.0",
-    "karma-sourcemap-loader": "^0.3.7",
+    "jsdom-global": "^3.0.2",
-    "karma-webpack": "^3.0.5",
-    "mocha": "^5.2.0",
-    "phantomjs-prebuilt": "^2.1.16",
     "rimraf": "^2.6.2",
     "rollup": "^1.0.0",
     "rollup-plugin-buble": "^0.19.4",
     "rollup-plugin-commonjs": "^9.2.0",
     "rollup-plugin-json": "^3.1.0",
     "rollup-plugin-node-resolve": "^4.0.0",
-    "snazzy": "^8.0.0",
+    "rollup-plugin-terser": "^4.0.4",
-    "standard": "^12.0.1",
-    "uglify-js": "^3.4.9",
     "update-section": "^0.3.3",
-    "vue": "^2.5.17",
+    "vue": "^2.6.3",
-    "vue-loader": "^15.4.2",
+    "vue-jest": "^3.0.2",
-    "vue-router": "^3.0.2",
+    "vue-server-renderer": "^2.6.3",
-    "vue-server-renderer": "^2.5.17",
+    "vue-template-compiler": "^2.6.3"
-    "vue-template-compiler": "^2.5.17",
-    "vuex": "^3.0.1",
-    "webpack": "^4.26.1",
-    "webpack-dev-server": "^3.1.10"
   },
   "files": [
     "lib",
     "types/index.d.ts",
     "types/vue.d.ts"
   ],
-  "homepage": "https://github.com/declandewet/vue-meta",
+  "homepage": "https://github.com/nuxt/vue-meta",
   "keywords": [
     "attribute",
     "google",
@@ -97,28 +83,12 @@
     "vue"
   ],
   "license": "MIT",
-  "main": "lib/vue-meta.js",
+  "main": "lib/vue-meta.common.js",
+  "web": "lib/vue-meta.js",
+  "module": "src/index.js",
   "typings": "types/index.d.ts",
-  "nyc": {
-    "exclude": [
-      "test/**/*.js"
-    ]
-  },
   "repository": {
-    "url": "git@github.com:declandewet/vue-meta.git",
+    "url": "git@github.com/nuxt/vue-meta.git",
     "type": "git"
-  },
-  "standard": {
-    "globals": [
-      "Vue",
-      "define",
-      "describe",
-      "it",
-      "expect",
-      "before",
-      "beforeEach",
-      "after",
-      "afterEach"
-    ]
   }
 }

rollup.config.js

@@ -1,27 +1,53 @@
-import commonjs from 'rollup-plugin-commonjs'
+import commonJs from 'rollup-plugin-commonjs'
 import nodeResolve from 'rollup-plugin-node-resolve'
 import json from 'rollup-plugin-json'
 import buble from 'rollup-plugin-buble'
+import { terser } from 'rollup-plugin-terser'
 
 const pkg = require('./package.json')
 
-export default {
+const banner =  `/**
-  input: './src/index.js',
-  output: {
-    file: pkg.main,
-    format: 'umd',
-    name: 'VueMeta',
-    banner: `/**
  * vue-meta v${pkg.version}
  * (c) ${new Date().getFullYear()} Declan de Wet & Sébastien Chopin (@Atinux)
  * @license MIT
  */
 `.replace(/ {4}/gm, '').trim()
+
+const baseConfig = {
+  input: './src/index.js',
+  output: {
+    file: pkg.web,
+    format: 'umd',
+    name: 'VueMeta',
+    sourcemap: false,
+    banner
   },
   plugins: [
     json(),
-    nodeResolve({ jsnext: true }),
+    nodeResolve(),
-    commonjs(),
+    commonJs(),
-    buble()
+    buble(),
   ]
 }
+
+export default [{
+  ...baseConfig,
+}, {
+  ...baseConfig,
+  output: {
+    ...baseConfig.output,
+    file: pkg.web.replace('.js', '.min.js'),
+  },
+  plugins: [
+    ...baseConfig.plugins,
+    terser()
+  ]
+}, {
+  ...baseConfig,
+  output: {
+    ...baseConfig.output,
+    file: pkg.main,
+    format: 'cjs'
+  },
+  external: Object.keys(pkg.dependencies)
+}]

src/client/batchUpdate.js

@@ -1,6 +1,6 @@
 // fallback to timers if rAF not present
 const stopUpdate = (typeof window !== 'undefined' ? window.cancelAnimationFrame : null) || clearTimeout
-const startUpdate = (typeof window !== 'undefined' ? window.requestAnimationFrame : null) || ((cb) => setTimeout(cb, 0))
+const startUpdate = (typeof window !== 'undefined' ? window.requestAnimationFrame : null) || (cb => setTimeout(cb, 0))
 
 /**
  * Performs a batched update. Uses requestAnimationFrame to prevent
@@ -12,7 +12,7 @@ const startUpdate = (typeof window !== 'undefined' ? window.requestAnimationFram
  * @param  {Function} callback - the update to perform
  * @return {Number} id - a new ID
  */
-export default function batchUpdate (id, callback) {
+export default function batchUpdate(id, callback) {
   stopUpdate(id)
   return startUpdate(() => {
     id = null

src/client/refresh.js

@@ -1,7 +1,7 @@
 import getMetaInfo from '../shared/getMetaInfo'
 import updateClientMetaInfo from './updateClientMetaInfo'
 
-export default function _refresh (options = {}) {
+export default function _refresh(options = {}) {
   /**
    * When called, will update the current meta info with new meta info.
    * Useful when updating meta info as the result of an asynchronous
@@ -12,9 +12,16 @@ export default function _refresh (options = {}) {
    *
    * @return {Object} - new meta info
    */
-  return function refresh () {
+  return function refresh() {
-    const info = getMetaInfo(options)(this.$root)
+    const metaInfo = getMetaInfo(options, this.$root)
-    updateClientMetaInfo(options).call(this, info)
+
-    return info
+    const tags = updateClientMetaInfo(options, metaInfo)
+
+    // emit "event" with new info
+    if (tags && typeof metaInfo.changed === 'function') {
+      metaInfo.changed.call(this, metaInfo, tags.addedTags, tags.removedTags)
+    }
+
+    return metaInfo
   }
 }

src/client/updateClientMetaInfo.js

@@ -1,64 +1,75 @@
-import updateTitle from './updaters/updateTitle'
+import { updateAttribute, updateTag, updateTitle } from './updaters'
-import updateTagAttributes from './updaters/updateTagAttributes'
-import updateTags from './updaters/updateTags'
 
-export default function _updateClientMetaInfo (options = {}) {
+const getTag = (tags, tag) => {
+  if (!tags[tag]) {
+    tags[tag] = document.getElementsByTagName(tag)[0]
+  }
+
+  return tags[tag]
+}
+
+/**
+ * Performs client-side updates when new meta info is received
+ *
+ * @param  {Object} newInfo - the meta info to update to
+ */
+export default function updateClientMetaInfo(options = {}, newInfo) {
   const { ssrAttribute } = options
 
-  /**
+  // only cache tags for current update
-   * Performs client-side updates when new meta info is received
+  const tags = {}
-   *
-   * @param  {Object} newInfo - the meta info to update to
-   */
-  return function updateClientMetaInfo (newInfo) {
-    const htmlTag = document.getElementsByTagName('html')[0]
-    // if this is not a server render, then update
-    if (htmlTag.getAttribute(ssrAttribute) === null) {
-      // initialize tracked changes
-      const addedTags = {}
-      const removedTags = {}
 
-      Object.keys(newInfo).forEach((key) => {
+  const htmlTag = getTag(tags, 'html')
-        switch (key) {
-          // update the title
-          case 'title':
-            updateTitle(options)(newInfo.title)
-            break
-          // update attributes
-          case 'htmlAttrs':
-            updateTagAttributes(options)(newInfo[key], htmlTag)
-            break
-          case 'bodyAttrs':
-            updateTagAttributes(options)(newInfo[key], document.getElementsByTagName('body')[0])
-            break
-          case 'headAttrs':
-            updateTagAttributes(options)(newInfo[key], document.getElementsByTagName('head')[0])
-            break
-          // ignore these
-          case 'titleChunk':
-          case 'titleTemplate':
-          case 'changed':
-          case '__dangerouslyDisableSanitizers':
-            break
-          // catch-all update tags
-          default:
-            const headTag = document.getElementsByTagName('head')[0]
-            const bodyTag = document.getElementsByTagName('body')[0]
-            const { oldTags, newTags } = updateTags(options)(key, newInfo[key], headTag, bodyTag)
-            if (newTags.length) {
-              addedTags[key] = newTags
-              removedTags[key] = oldTags
-            }
-        }
-      })
 
-      // emit "event" with new info
+  // if this is not a server render, then update
-      if (typeof newInfo.changed === 'function') {
+  if (htmlTag.getAttribute(ssrAttribute) === null) {
-        newInfo.changed.call(this, newInfo, addedTags, removedTags)
+    // initialize tracked changes
+    const addedTags = {}
+    const removedTags = {}
+
+    Object.keys(newInfo).forEach((type) => {
+      // ignore these
+      if ([
+        'titleChunk',
+        'titleTemplate',
+        'changed',
+        '__dangerouslyDisableSanitizers',
+        '__dangerouslyDisableSanitizersByTagID'
+      ].includes(type)) {
+        return
       }
-    } else {
+
-      // remove the server render attribute so we can update on changes
+      if (type === 'title') {
-      htmlTag.removeAttribute(ssrAttribute)
+        // update the title
-    }
+        updateTitle(newInfo.title)
+        return
+      }
+
+      if (['htmlAttrs', 'headAttrs', 'bodyAttrs'].includes(type)) {
+        const tagName = type.substr(0, 4)
+        updateAttribute(options, newInfo[type], getTag(tags, tagName))
+        return
+      }
+
+      const { oldTags, newTags } = updateTag(
+        options,
+        type,
+        newInfo[type],
+        getTag(tags, 'head'),
+        getTag(tags, 'body')
+      )
+
+      if (newTags.length) {
+        addedTags[type] = newTags
+        removedTags[type] = oldTags
+      }
+    })
+
+    return { addedTags, removedTags }
+  } else {
+    // remove the server render attribute so we can update on changes
+    htmlTag.removeAttribute(ssrAttribute)
   }
+
+  return false
 }

src/client/updaters/attribute.js

@@ -0,0 +1,35 @@
+/**
+ * Updates the document's html tag attributes
+ *
+ * @param  {Object} attrs - the new document html attributes
+ * @param  {HTMLElement} tag - the HTMLElement tag to update with new attrs
+ */
+export default function updateAttribute({ attribute } = {}, attrs, tag) {
+  const vueMetaAttrString = tag.getAttribute(attribute)
+  const vueMetaAttrs = vueMetaAttrString ? vueMetaAttrString.split(',') : []
+  const toRemove = [].concat(vueMetaAttrs)
+
+  for (const attr in attrs) {
+    if (attrs.hasOwnProperty(attr)) {
+      const val = attrs[attr] || ''
+      tag.setAttribute(attr, val)
+
+      if (vueMetaAttrs.indexOf(attr) === -1) {
+        vueMetaAttrs.push(attr)
+      }
+
+      const keepIndex = toRemove.indexOf(attr)
+      if (keepIndex !== -1) {
+        toRemove.splice(keepIndex, 1)
+      }
+    }
+  }
+
+  toRemove.forEach(attr => tag.removeAttribute(attr))
+
+  if (vueMetaAttrs.length === toRemove.length) {
+    tag.removeAttribute(attribute)
+  } else {
+    tag.setAttribute(attribute, (vueMetaAttrs.sort()).join(','))
+  }
+}

src/client/updaters/index.js

@@ -0,0 +1,3 @@
+export { default as updateAttribute } from './attribute'
+export { default as updateTitle } from './title'
+export { default as updateTag } from './tag'

src/client/updaters/tag.js

@@ -0,0 +1,84 @@
+// borrow the slice method
+const toArray = Function.prototype.call.bind(Array.prototype.slice)
+
+/**
+ * Updates meta tags inside <head> and <body> on the client. Borrowed from `react-helmet`:
+ * https://github.com/nfl/react-helmet/blob/004d448f8de5f823d10f838b02317521180f34da/src/Helmet.js#L195-L245
+ *
+ * @param  {('meta'|'base'|'link'|'style'|'script'|'noscript')} type - the name of the tag
+ * @param  {(Array<Object>|Object)} tags - an array of tag objects or a single object in case of base
+ * @return {Object} - a representation of what tags changed
+ */
+export default function updateTag({ attribute, tagIDKeyName } = {}, type, tags, headTag, bodyTag) {
+  const oldHeadTags = toArray(headTag.querySelectorAll(`${type}[${attribute}]`))
+  const oldBodyTags = toArray(bodyTag.querySelectorAll(`${type}[${attribute}][data-body="true"]`))
+  const newTags = []
+
+  if (tags.length > 1) {
+    // remove duplicates that could have been found by merging tags
+    // which include a mixin with metaInfo and that mixin is used
+    // by multiple components on the same page
+    const found = []
+    tags = tags.filter((x) => {
+      const k = JSON.stringify(x)
+      const res = !found.includes(k)
+      found.push(k)
+      return res
+    })
+  }
+
+  if (tags && tags.length) {
+    tags.forEach((tag) => {
+      const newElement = document.createElement(type)
+      newElement.setAttribute(attribute, 'true')
+
+      const oldTags = tag.body !== true ? oldHeadTags : oldBodyTags
+
+      for (const attr in tag) {
+        if (tag.hasOwnProperty(attr)) {
+          if (attr === 'innerHTML') {
+            newElement.innerHTML = tag.innerHTML
+          } else if (attr === 'cssText') {
+            if (newElement.styleSheet) {
+              newElement.styleSheet.cssText = tag.cssText
+            } else {
+              newElement.appendChild(document.createTextNode(tag.cssText))
+            }
+          } else if ([tagIDKeyName, 'body'].indexOf(attr) !== -1) {
+            const _attr = `data-${attr}`
+            const value = (typeof tag[attr] === 'undefined') ? '' : tag[attr]
+            newElement.setAttribute(_attr, value)
+          } else {
+            const value = (typeof tag[attr] === 'undefined') ? '' : tag[attr]
+            newElement.setAttribute(attr, value)
+          }
+        }
+      }
+
+      // Remove a duplicate tag from domTagstoRemove, so it isn't cleared.
+      let indexToDelete
+      const hasEqualElement = oldTags.some((existingTag, index) => {
+        indexToDelete = index
+        return newElement.isEqualNode(existingTag)
+      })
+
+      if (hasEqualElement && (indexToDelete || indexToDelete === 0)) {
+        oldTags.splice(indexToDelete, 1)
+      } else {
+        newTags.push(newElement)
+      }
+    })
+  }
+
+  const oldTags = oldHeadTags.concat(oldBodyTags)
+  oldTags.forEach(tag => tag.parentNode.removeChild(tag))
+  newTags.forEach((tag) => {
+    if (tag.getAttribute('data-body') === 'true') {
+      bodyTag.appendChild(tag)
+    } else {
+      headTag.appendChild(tag)
+    }
+  })
+
+  return { oldTags, newTags }
+}

src/client/updaters/title.js

@@ -0,0 +1,8 @@
+/**
+ * Updates the document title
+ *
+ * @param  {String} title - the new title of the document
+ */
+export default function updateTitle(title = document.title) {
+  document.title = title
+}

src/client/updaters/updateTagAttributes.js

@@ -1,37 +0,0 @@
-export default function _updateTagAttributes (options = {}) {
-  const { attribute } = options
-
-  /**
-   * Updates the document's html tag attributes
-   *
-   * @param  {Object} attrs - the new document html attributes
-   * @param  {HTMLElement} tag - the HTMLElement tag to update with new attrs
-   */
-  return function updateTagAttributes (attrs, tag) {
-    const vueMetaAttrString = tag.getAttribute(attribute)
-    const vueMetaAttrs = vueMetaAttrString ? vueMetaAttrString.split(',') : []
-    const toRemove = [].concat(vueMetaAttrs)
-    for (let attr in attrs) {
-      if (attrs.hasOwnProperty(attr)) {
-        const val = attrs[attr] || ''
-        tag.setAttribute(attr, val)
-        if (vueMetaAttrs.indexOf(attr) === -1) {
-          vueMetaAttrs.push(attr)
-        }
-        const saveIndex = toRemove.indexOf(attr)
-        if (saveIndex !== -1) {
-          toRemove.splice(saveIndex, 1)
-        }
-      }
-    }
-    let i = toRemove.length - 1
-    for (; i >= 0; i--) {
-      tag.removeAttribute(toRemove[i])
-    }
-    if (vueMetaAttrs.length === toRemove.length) {
-      tag.removeAttribute(attribute)
-    } else {
-      tag.setAttribute(attribute, vueMetaAttrs.join(','))
-    }
-  }
-}

src/client/updaters/updateTags.js

@@ -1,86 +0,0 @@
-// borrow the slice method
-const toArray = Function.prototype.call.bind(Array.prototype.slice)
-
-export default function _updateTags (options = {}) {
-  const { attribute } = options
-
-  /**
-   * Updates meta tags inside <head> and <body> on the client. Borrowed from `react-helmet`:
-   * https://github.com/nfl/react-helmet/blob/004d448f8de5f823d10f838b02317521180f34da/src/Helmet.js#L195-L245
-   *
-   * @param  {('meta'|'base'|'link'|'style'|'script'|'noscript')} type - the name of the tag
-   * @param  {(Array<Object>|Object)} tags - an array of tag objects or a single object in case of base
-   * @return {Object} - a representation of what tags changed
-   */
-  return function updateTags (type, tags, headTag, bodyTag) {
-    const oldHeadTags = toArray(headTag.querySelectorAll(`${type}[${attribute}]`))
-    const oldBodyTags = toArray(bodyTag.querySelectorAll(`${type}[${attribute}][data-body="true"]`))
-    const newTags = []
-    let indexToDelete
-
-    if (tags.length > 1) {
-      // remove duplicates that could have been found by merging tags
-      // which include a mixin with metaInfo and that mixin is used
-      // by multiple components on the same page
-      const found = []
-      tags = tags.map(x => {
-        const k = JSON.stringify(x)
-        if (found.indexOf(k) < 0) {
-          found.push(k)
-          return x
-        }
-      }).filter(x => x)
-    }
-
-    if (tags && tags.length) {
-      tags.forEach((tag) => {
-        const newElement = document.createElement(type)
-        const oldTags = tag.body !== true ? oldHeadTags : oldBodyTags
-
-        for (const attr in tag) {
-          if (tag.hasOwnProperty(attr)) {
-            if (attr === 'innerHTML') {
-              newElement.innerHTML = tag.innerHTML
-            } else if (attr === 'cssText') {
-              if (newElement.styleSheet) {
-                newElement.styleSheet.cssText = tag.cssText
-              } else {
-                newElement.appendChild(document.createTextNode(tag.cssText))
-              }
-            } else if ([options.tagIDKeyName, 'body'].indexOf(attr) !== -1) {
-              const _attr = `data-${attr}`
-              const value = (typeof tag[attr] === 'undefined') ? '' : tag[attr]
-              newElement.setAttribute(_attr, value)
-            } else {
-              const value = (typeof tag[attr] === 'undefined') ? '' : tag[attr]
-              newElement.setAttribute(attr, value)
-            }
-          }
-        }
-
-        newElement.setAttribute(attribute, 'true')
-
-        // Remove a duplicate tag from domTagstoRemove, so it isn't cleared.
-        if (oldTags.some((existingTag, index) => {
-          indexToDelete = index
-          return newElement.isEqualNode(existingTag)
-        })) {
-          oldTags.splice(indexToDelete, 1)
-        } else {
-          newTags.push(newElement)
-        }
-      })
-    }
-    const oldTags = oldHeadTags.concat(oldBodyTags)
-    oldTags.forEach((tag) => tag.parentNode.removeChild(tag))
-    newTags.forEach((tag) => {
-      if (tag.getAttribute('data-body') === 'true') {
-        bodyTag.appendChild(tag)
-      } else {
-        headTag.appendChild(tag)
-      }
-    })
-
-    return { oldTags, newTags }
-  }
-}

src/client/updaters/updateTitle.js

@@ -1,10 +0,0 @@
-export default function _updateTitle () {
-  /**
-   * Updates the document title
-   *
-   * @param  {String} title - the new title of the document
-   */
-  return function updateTitle (title = document.title) {
-    document.title = title
-  }
-}

src/index.js

@@ -1,5 +1,5 @@
-import install from './shared/plugin'
 import { version } from '../package.json'
+import install from './shared/plugin'
 
 install.version = version
 

src/server/generateServerInjector.js

@@ -1,25 +1,21 @@
-import titleGenerator from './generators/titleGenerator'
+import { titleGenerator, attributeGenerator, tagGenerator } from './generators'
-import attrsGenerator from './generators/attrsGenerator'
-import tagGenerator from './generators/tagGenerator'
 
-export default function _generateServerInjector (options = {}) {
+/**
-  /**
+ * Converts a meta info property to one that can be stringified on the server
-   * Converts a meta info property to one that can be stringified on the server
+ *
-   *
+ * @param  {String} type - the type of data to convert
-   * @param  {String} type - the type of data to convert
+ * @param  {(String|Object|Array<Object>)} data - the data value
-   * @param  {(String|Object|Array<Object>)} data - the data value
+ * @return {Object} - the new injector
-   * @return {Object} - the new injector
+ */
-   */
+
-  return function generateServerInjector (type, data) {
+export default function generateServerInjector(options, type, data) {
-    switch (type) {
+  if (type === 'title') {
-      case 'title':
+    return titleGenerator(options, type, data)
-        return titleGenerator(options)(type, data)
-      case 'htmlAttrs':
-      case 'bodyAttrs':
-      case 'headAttrs':
-        return attrsGenerator(options)(type, data)
-      default:
-        return tagGenerator(options)(type, data)
-    }
   }
+
+  if (['htmlAttrs', 'headAttrs', 'bodyAttrs'].includes(type)) {
+    return attributeGenerator(options, type, data)
+  }
+
+  return tagGenerator(options, type, data)
 }

src/server/generators/attribute.js

@@ -0,0 +1,30 @@
+/**
+ * Generates tag attributes for use on the server.
+ *
+ * @param  {('bodyAttrs'|'htmlAttrs'|'headAttrs')} type - the type of attributes to generate
+ * @param  {Object} data - the attributes to generate
+ * @return {Object} - the attribute generator
+ */
+export default function attributeGenerator({ attribute } = {}, type, data) {
+  return {
+    text() {
+      let attributeStr = ''
+      const watchedAttrs = []
+
+      for (const attr in data) {
+        if (data.hasOwnProperty(attr)) {
+          watchedAttrs.push(attr)
+
+          attributeStr += typeof data[attr] !== 'undefined'
+            ? `${attr}="${data[attr]}"`
+            : attr
+
+          attributeStr += ' '
+        }
+      }
+
+      attributeStr += `${attribute}="${(watchedAttrs.sort()).join(',')}"`
+      return attributeStr
+    }
+  }
+}

src/server/generators/attrsGenerator.js

@@ -1,31 +0,0 @@
-export default function _attrsGenerator (options = {}) {
-  const { attribute } = options
-
-  /**
-   * Generates tag attributes for use on the server.
-   *
-   * @param  {('bodyAttrs'|'htmlAttrs'|'headAttrs')} type - the type of attributes to generate
-   * @param  {Object} data - the attributes to generate
-   * @return {Object} - the attribute generator
-   */
-  return function attrsGenerator (type, data) {
-    return {
-      text () {
-        let attributeStr = ''
-        let watchedAttrs = []
-        for (let attr in data) {
-          if (data.hasOwnProperty(attr)) {
-            watchedAttrs.push(attr)
-            attributeStr += `${
-              typeof data[attr] !== 'undefined'
-                ? `${attr}="${data[attr]}"`
-                : attr
-            } `
-          }
-        }
-        attributeStr += `${attribute}="${watchedAttrs.join(',')}"`
-        return attributeStr.trim()
-      }
-    }
-  }
-}

src/server/generators/index.js

@@ -0,0 +1,3 @@
+export { default as attributeGenerator } from './attribute'
+export { default as titleGenerator } from './title'
+export { default as tagGenerator } from './tag'

src/server/generators/tag.js

@@ -0,0 +1,60 @@
+/**
+ * Generates meta, base, link, style, script, noscript tags for use on the server
+ *
+ * @param  {('meta'|'base'|'link'|'style'|'script'|'noscript')} the name of the tag
+ * @param  {(Array<Object>|Object)} tags - an array of tag objects or a single object in case of base
+ * @return {Object} - the tag generator
+ */
+export default function tagGenerator({ attribute, tagIDKeyName } = {}, type, tags) {
+  return {
+    text({ body = false } = {}) {
+      // build a string containing all tags of this type
+      return tags.reduce((tagsStr, tag) => {
+        if (Object.keys(tag).length === 0) {
+          return tagsStr // Bail on empty tag object
+        }
+
+        if (Boolean(tag.body) !== body) {
+          return tagsStr
+        }
+
+        // build a string containing all attributes of this tag
+        const attrs = Object.keys(tag).reduce((attrsStr, attr) => {
+          // these attributes are treated as children on the tag
+          if (['innerHTML', 'cssText', 'once'].includes(attr)) {
+            return attrsStr
+          }
+
+          // these form the attribute list for this tag
+          let prefix = ''
+          if ([tagIDKeyName, 'body'].includes(attr)) {
+            prefix = 'data-'
+          }
+
+          return typeof tag[attr] === 'undefined'
+            ? `${attrsStr} ${prefix}${attr}`
+            : `${attrsStr} ${prefix}${attr}="${tag[attr]}"`
+        }, '')
+
+        // grab child content from one of these attributes, if possible
+        const content = tag.innerHTML || tag.cssText || ''
+
+        // generate tag exactly without any other redundant attribute
+        const observeTag = tag.once
+          ? ''
+          : `${attribute}="true"`
+
+        // these tags have no end tag
+        const hasEndTag = !['base', 'meta', 'link'].includes(type)
+
+        // these tag types will have content inserted
+        const hasContent = hasEndTag && ['noscript', 'script', 'style'].includes(type)
+
+        // the final string for this specific tag
+        return !hasContent
+          ? `${tagsStr}<${type} ${observeTag}${attrs}${hasEndTag ? '/' : ''}>`
+          : `${tagsStr}<${type} ${observeTag}${attrs}>${content}</${type}>`
+      }, '')
+    }
+  }
+}

src/server/generators/tagGenerator.js

@@ -1,59 +0,0 @@
-export default function _tagGenerator (options = {}) {
-  const { attribute } = options
-
-  /**
-   * Generates meta, base, link, style, script, noscript tags for use on the server
-   *
-   * @param  {('meta'|'base'|'link'|'style'|'script'|'noscript')} the name of the tag
-   * @param  {(Array<Object>|Object)} tags - an array of tag objects or a single object in case of base
-   * @return {Object} - the tag generator
-   */
-  return function tagGenerator (type, tags) {
-    return {
-      text ({ body = false } = {}) {
-        // build a string containing all tags of this type
-        return tags.reduce((tagsStr, tag) => {
-          if (Object.keys(tag).length === 0) return tagsStr // Bail on empty tag object
-          if (!!tag.body !== body) return tagsStr
-          // build a string containing all attributes of this tag
-          const attrs = Object.keys(tag).reduce((attrsStr, attr) => {
-            switch (attr) {
-              // these attributes are treated as children on the tag
-              case 'innerHTML':
-              case 'cssText':
-              case 'once':
-                return attrsStr
-              // these form the attribute list for this tag
-              default:
-                if ([options.tagIDKeyName, 'body'].indexOf(attr) !== -1) {
-                  return `${attrsStr} data-${attr}="${tag[attr]}"`
-                }
-                return typeof tag[attr] === 'undefined'
-                  ? `${attrsStr} ${attr}`
-                  : `${attrsStr} ${attr}="${tag[attr]}"`
-            }
-          }, '').trim()
-
-          // grab child content from one of these attributes, if possible
-          const content = tag.innerHTML || tag.cssText || ''
-
-          // generate tag exactly without any other redundant attribute
-          const observeTag = tag.once
-            ? ''
-            : `${attribute}="true" `
-
-          // these tags have no end tag
-          const hasEndTag = !['base', 'meta', 'link'].includes(type)
-
-          // these tag types will have content inserted
-          const hasContent = hasEndTag && ['noscript', 'script', 'style'].includes(type)
-
-          // the final string for this specific tag
-          return !hasContent
-            ? `${tagsStr}<${type} ${observeTag}${attrs}${hasEndTag ? '/' : ''}>`
-            : `${tagsStr}<${type} ${observeTag}${attrs}>${content}</${type}>`
-        }, '')
-      }
-    }
-  }
-}

src/server/generators/title.js

@@ -0,0 +1,14 @@
+/**
+ * Generates title output for the server
+ *
+ * @param  {'title'} type - the string "title"
+ * @param  {String} data - the title text
+ * @return {Object} - the title generator
+ */
+export default function titleGenerator({ attribute } = {}, type, data) {
+  return {
+    text() {
+      return `<${type} ${attribute}="true">${data}</${type}>`
+    }
+  }
+}

src/server/generators/titleGenerator.js

@@ -1,18 +0,0 @@
-export default function _titleGenerator (options = {}) {
-  const { attribute } = options
-
-  /**
-   * Generates title output for the server
-   *
-   * @param  {'title'} type - the string "title"
-   * @param  {String} data - the title text
-   * @return {Object} - the title generator
-   */
-  return function titleGenerator (type, data) {
-    return {
-      text () {
-        return `<${type} ${attribute}="true">${data}</${type}>`
-      }
-    }
-  }
-}

src/server/inject.js

@@ -1,7 +1,7 @@
 import getMetaInfo from '../shared/getMetaInfo'
 import generateServerInjector from './generateServerInjector'
 
-export default function _inject (options = {}) {
+export default function _inject(options = {}) {
   /**
    * Converts the state of the meta info object such that each item
    * can be compiled to a tag string on the server
@@ -9,17 +9,18 @@ export default function _inject (options = {}) {
    * @this {Object} - Vue instance - ideally the root component
    * @return {Object} - server meta info with `toString` methods
    */
-  return function inject () {
+
+  return function inject() {
     // get meta info with sensible defaults
-    const info = getMetaInfo(options)(this.$root)
+    const metaInfo = getMetaInfo(options, this.$root)
 
     // generate server injectors
-    for (let key in info) {
+    for (const key in metaInfo) {
-      if (info.hasOwnProperty(key) && key !== 'titleTemplate' && key !== 'titleChunk') {
+      if (!['titleTemplate', 'titleChunk'].includes(key) && metaInfo.hasOwnProperty(key)) {
-        info[key] = generateServerInjector(options)(key, info[key])
+        metaInfo[key] = generateServerInjector(options, key, metaInfo[key])
       }
     }
 
-    return info
+    return metaInfo
   }
 }

src/shared/$meta.js

@@ -1,13 +1,13 @@
 import inject from '../server/inject'
 import refresh from '../client/refresh'
 
-export default function _$meta (options = {}) {
+export default function _$meta(options = {}) {
   /**
    * Returns an injector for server-side rendering.
    * @this {Object} - the Vue instance (a root component)
    * @return {Object} - injector
    */
-  return function $meta () {
+  return function $meta() {
     return {
       inject: inject(options).bind(this),
       refresh: refresh(options).bind(this)

src/shared/getComponentOption.js

@@ -1,6 +1,6 @@
 import deepmerge from 'deepmerge'
-import uniqBy from './uniqBy'
 import uniqueId from 'lodash.uniqueid'
+import uniqBy from './uniqBy'
 
 /**
  * Returns the `opts.option` $option value of the given `opts.component`.
@@ -10,21 +10,22 @@ import uniqueId from 'lodash.uniqueid'
  *
  * @param  {Object} opts - options
  * @param  {Object} opts.component - Vue component to fetch option data from
- * @param  {String} opts.option - what option to look for
  * @param  {Boolean} opts.deep - look for data in child components as well?
  * @param  {Function} opts.arrayMerge - how should arrays be merged?
+ * @param  {String} opts.keyName - the name of the option to look for
  * @param  {Object} [result={}] - result so far
  * @return {Object} result - final aggregated result
  */
-export default function getComponentOption (opts, result = {}) {
+export default function getComponentOption({ component, deep, arrayMerge, keyName, metaTemplateKeyName, tagIDKeyName, contentKeyName } = {}, result = {}) {
-  const { component, option, deep, arrayMerge, metaTemplateKeyName, tagIDKeyName, contentKeyName } = opts
   const { $options } = component
 
-  if (component._inactive) return result
+  if (component._inactive) {
+    return result
+  }
 
   // only collect option data if it exists
-  if (typeof $options[option] !== 'undefined' && $options[option] !== null) {
+  if (typeof $options[keyName] !== 'undefined' && $options[keyName] !== null) {
-    let data = $options[option]
+    let data = $options[keyName]
 
     // if option is a function, replace it with it's result
     if (typeof data === 'function') {
@@ -44,14 +45,15 @@ export default function getComponentOption (opts, result = {}) {
     component.$children.forEach((childComponent) => {
       result = getComponentOption({
         component: childComponent,
-        option,
+        keyName,
         deep,
         arrayMerge
       }, result)
     })
   }
+
   if (metaTemplateKeyName && result.hasOwnProperty('meta')) {
-    result.meta = Object.keys(result.meta).map(metaKey => {
+    result.meta = Object.keys(result.meta).map((metaKey) => {
       const metaObject = result.meta[metaKey]
       if (!metaObject.hasOwnProperty(metaTemplateKeyName) || !metaObject.hasOwnProperty(contentKeyName) || typeof metaObject[metaTemplateKeyName] === 'undefined') {
         return result.meta[metaKey]

src/shared/getMetaInfo.js

@@ -3,7 +3,7 @@ import isPlainObject from 'lodash.isplainobject'
 import isArray from './isArray'
 import getComponentOption from './getComponentOption'
 
-const escapeHTML = (str) => typeof window === 'undefined'
+const escapeHTML = str => typeof window === 'undefined'
   // server-side escape sequence
   ? String(str)
     .replace(/&/g, '&')
@@ -19,138 +19,145 @@ const escapeHTML = (str) => typeof window === 'undefined'
     .replace(/"/g, '\u0022')
     .replace(/'/g, '\u0027')
 
-export default function _getMetaInfo (options = {}) {
+const applyTemplate = (component, template, chunk) =>
-  const { keyName, tagIDKeyName, metaTemplateKeyName, contentKeyName } = options
+  typeof template === 'function' ? template.call(component, chunk) : template.replace(/%s/g, chunk)
-  /**
-   * Returns the correct meta info for the given component
-   * (child components will overwrite parent meta info)
-   *
-   * @param  {Object} component - the Vue instance to get meta info from
-   * @return {Object} - returned meta info
-   */
-  return function getMetaInfo (component) {
-    // set some sane defaults
-    const defaultInfo = {
-      title: '',
-      titleChunk: '',
-      titleTemplate: '%s',
-      htmlAttrs: {},
-      bodyAttrs: {},
-      headAttrs: {},
-      meta: [],
-      base: [],
-      link: [],
-      style: [],
-      script: [],
-      noscript: [],
-      __dangerouslyDisableSanitizers: [],
-      __dangerouslyDisableSanitizersByTagID: {}
-    }
 
-    // collect & aggregate all metaInfo $options
+/**
-    let info = getComponentOption({
+ * Returns the correct meta info for the given component
-      component,
+ * (child components will overwrite parent meta info)
-      option: keyName,
+ *
-      deep: true,
+ * @param  {Object} component - the Vue instance to get meta info from
-      metaTemplateKeyName,
+ * @return {Object} - returned meta info
-      tagIDKeyName,
+ */
-      contentKeyName,
+export default function getMetaInfo({ keyName, tagIDKeyName, metaTemplateKeyName, contentKeyName } = {}, component) {
-      arrayMerge (target, source) {
+  // set some sane defaults
-        // we concat the arrays without merging objects contained in,
+  const defaultInfo = {
-        // but we check for a `vmid` property on each object in the array
+    title: '',
-        // using an O(1) lookup associative array exploit
+    titleChunk: '',
-        // note the use of "for in" - we are looping through arrays here, not
+    titleTemplate: '%s',
-        // plain objects
+    htmlAttrs: {},
-        const destination = []
+    bodyAttrs: {},
-        for (let targetIndex in target) {
+    headAttrs: {},
-          const targetItem = target[targetIndex]
+    meta: [],
-          let shared = false
+    base: [],
-          for (let sourceIndex in source) {
+    link: [],
-            const sourceItem = source[sourceIndex]
+    style: [],
-            if (targetItem[tagIDKeyName] && targetItem[tagIDKeyName] === sourceItem[tagIDKeyName]) {
+    script: [],
-              const targetTemplate = targetItem[metaTemplateKeyName]
+    noscript: [],
-              const sourceTemplate = sourceItem[metaTemplateKeyName]
+    __dangerouslyDisableSanitizers: [],
-              if (targetTemplate && !sourceTemplate) {
+    __dangerouslyDisableSanitizersByTagID: {}
-                sourceItem[contentKeyName] = applyTemplate(component)(targetTemplate)(sourceItem[contentKeyName])
+  }
-              }
+
-              // If template defined in child but content in parent
+  // collect & aggregate all metaInfo $options
-              if (targetTemplate && sourceTemplate && !sourceItem[contentKeyName]) {
+  let info = getComponentOption({
-                sourceItem[contentKeyName] = applyTemplate(component)(sourceTemplate)(targetItem[contentKeyName])
+    deep: true,
-                delete sourceItem[metaTemplateKeyName]
+    component,
-              }
+    keyName,
-              shared = true
+    metaTemplateKeyName,
-              break
+    tagIDKeyName,
+    contentKeyName,
+    arrayMerge(target, source) {
+      // we concat the arrays without merging objects contained in,
+      // but we check for a `vmid` property on each object in the array
+      // using an O(1) lookup associative array exploit
+      // note the use of "for in" - we are looping through arrays here, not
+      // plain objects
+      const destination = []
+
+      for (const targetIndex in target) {
+        const targetItem = target[targetIndex]
+        let shared = false
+
+        for (const sourceIndex in source) {
+          const sourceItem = source[sourceIndex]
+
+          if (targetItem[tagIDKeyName] && targetItem[tagIDKeyName] === sourceItem[tagIDKeyName]) {
+            const targetTemplate = targetItem[metaTemplateKeyName]
+            const sourceTemplate = sourceItem[metaTemplateKeyName]
+
+            if (targetTemplate && !sourceTemplate) {
+              sourceItem[contentKeyName] = applyTemplate(component, targetTemplate, sourceItem[contentKeyName])
             }
-          }
 
-          if (!shared) {
+            // If template defined in child but content in parent
-            destination.push(targetItem)
+            if (targetTemplate && sourceTemplate && !sourceItem[contentKeyName]) {
+              sourceItem[contentKeyName] = applyTemplate(component, sourceTemplate, targetItem[contentKeyName])
+              delete sourceItem[metaTemplateKeyName]
+            }
+
+            shared = true
+            break
           }
         }
 
-        return destination.concat(source)
+        if (!shared) {
-      }
+          destination.push(targetItem)
-    })
-
-    // Remove all "template" tags from meta
-
-    // backup the title chunk in case user wants access to it
-    if (info.title) {
-      info.titleChunk = info.title
-    }
-
-    // replace title with populated template
-    if (info.titleTemplate) {
-      info.title = applyTemplate(component)(info.titleTemplate)(info.titleChunk || '')
-    }
-
-    // convert base tag to an array so it can be handled the same way
-    // as the other tags
-    if (info.base) {
-      info.base = Object.keys(info.base).length ? [info.base] : []
-    }
-
-    const ref = info.__dangerouslyDisableSanitizers
-    const refByTagID = info.__dangerouslyDisableSanitizersByTagID
-
-    // sanitizes potentially dangerous characters
-    const escape = (info) => Object.keys(info).reduce((escaped, key) => {
-      let isDisabled = ref && ref.indexOf(key) > -1
-      const tagID = info[tagIDKeyName]
-      if (!isDisabled && tagID) {
-        isDisabled = refByTagID && refByTagID[tagID] && refByTagID[tagID].indexOf(key) > -1
-      }
-      const val = info[key]
-      escaped[key] = val
-      if (key === '__dangerouslyDisableSanitizers' || key === '__dangerouslyDisableSanitizersByTagID') {
-        return escaped
-      }
-      if (!isDisabled) {
-        if (typeof val === 'string') {
-          escaped[key] = escapeHTML(val)
-        } else if (isPlainObject(val)) {
-          escaped[key] = escape(val)
-        } else if (isArray(val)) {
-          escaped[key] = val.map(escape)
-        } else {
-          escaped[key] = val
         }
+      }
+
+      return destination.concat(source)
+    }
+  })
+
+  // Remove all "template" tags from meta
+
+  // backup the title chunk in case user wants access to it
+  if (info.title) {
+    info.titleChunk = info.title
+  }
+
+  // replace title with populated template
+  if (info.titleTemplate) {
+    info.title = applyTemplate(component, info.titleTemplate, info.titleChunk || '')
+  }
+
+  // convert base tag to an array so it can be handled the same way
+  // as the other tags
+  if (info.base) {
+    info.base = Object.keys(info.base).length ? [info.base] : []
+  }
+
+  const ref = info.__dangerouslyDisableSanitizers
+  const refByTagID = info.__dangerouslyDisableSanitizersByTagID
+
+  // sanitizes potentially dangerous characters
+  const escape = info => Object.keys(info).reduce((escaped, key) => {
+    let isDisabled = ref && ref.indexOf(key) > -1
+    const tagID = info[tagIDKeyName]
+
+    if (!isDisabled && tagID) {
+      isDisabled = refByTagID && refByTagID[tagID] && refByTagID[tagID].indexOf(key) > -1
+    }
+
+    const val = info[key]
+    escaped[key] = val
+
+    if (key === '__dangerouslyDisableSanitizers' || key === '__dangerouslyDisableSanitizersByTagID') {
+      return escaped
+    }
+
+    if (!isDisabled) {
+      if (typeof val === 'string') {
+        escaped[key] = escapeHTML(val)
+      } else if (isPlainObject(val)) {
+        escaped[key] = escape(val)
+      } else if (isArray(val)) {
+        escaped[key] = val.map(escape)
       } else {
         escaped[key] = val
       }
+    } else {
+      escaped[key] = val
+    }
 
-      return escaped
+    return escaped
-    }, {})
+  }, {})
 
-    // merge with defaults
+  // merge with defaults
-    info = deepmerge(defaultInfo, info)
+  info = deepmerge(defaultInfo, info)
 
-    // begin sanitization
+  // begin sanitization
-    info = escape(info)
+  info = escape(info)
 
-    return info
+  return info
-  }
 }
-
-const applyTemplate = component => template => chunk =>
-  typeof template === 'function' ? template.call(component, chunk) : template.replace(/%s/g, chunk)

src/shared/isArray.js

@@ -3,7 +3,7 @@
  * @param  {any}  arr - the object to check
  * @return {Boolean} - true if `arr` is an array
  */
-export default function isArray (arr) {
+export default function isArray(arr) {
   return Array.isArray
     ? Array.isArray(arr)
     : Object.prototype.toString.call(arr) === '[object Array]'

src/shared/plugin.js

@@ -1,6 +1,5 @@
-import assign from 'object-assign'
-import $meta from './$meta'
 import batchUpdate from '../client/batchUpdate'
+import $meta from './$meta'
 
 import {
   VUE_META_KEY_NAME,
@@ -19,7 +18,7 @@ if (typeof window !== 'undefined' && typeof window.Vue !== 'undefined') {
  * Plugin install function.
  * @param {Function} Vue - the Vue constructor.
  */
-export default function VueMeta (Vue, options = {}) {
+export default function VueMeta(Vue, options = {}) {
   // set some default options
   const defaultOptions = {
     keyName: VUE_META_KEY_NAME,
@@ -29,8 +28,15 @@ export default function VueMeta (Vue, options = {}) {
     ssrAttribute: VUE_META_SERVER_RENDERED_ATTRIBUTE,
     tagIDKeyName: VUE_META_TAG_LIST_ID_KEY_NAME
   }
+
   // combine options
-  options = assign(defaultOptions, options)
+  options = typeof options === 'object' ? options : {}
+
+  for (const key in defaultOptions) {
+    if (!options[key]) {
+      options[key] = defaultOptions[key]
+    }
+  }
 
   // bind the $meta method to this component instance
   Vue.prototype.$meta = $meta(options)
@@ -38,66 +44,115 @@ export default function VueMeta (Vue, options = {}) {
   // store an id to keep track of DOM updates
   let batchID = null
 
+  const triggerUpdate = (vm) => {
+    // batch potential DOM updates to prevent extraneous re-rendering
+    batchID = batchUpdate(batchID, () => vm.$meta().refresh())
+  }
+
   // watch for client side component updates
   Vue.mixin({
-    beforeCreate () {
+    beforeCreate() {
       // Add a marker to know if it uses metaInfo
       // _vnode is used to know that it's attached to a real component
       // useful if we use some mixin to add some meta tags (like nuxt-i18n)
-      if (typeof this.$options[options.keyName] !== 'undefined') {
+      if (typeof this.$options[options.keyName] !== 'undefined' && this.$options[options.keyName] !== null) {
         this._hasMetaInfo = true
-      }
+
-      // coerce function-style metaInfo to a computed prop so we can observe
+        // coerce function-style metaInfo to a computed prop so we can observe
-      // it on creation
+        // it on creation
-      if (typeof this.$options[options.keyName] === 'function') {
+        if (typeof this.$options[options.keyName] === 'function') {
-        if (typeof this.$options.computed === 'undefined') {
+          if (typeof this.$options.computed === 'undefined') {
-          this.$options.computed = {}
+            this.$options.computed = {}
+          }
+          this.$options.computed.$metaInfo = this.$options[options.keyName]
+
+          if (!this.$isServer) {
+            // if computed $metaInfo exists, watch it for updates & trigger a refresh
+            // when it changes (i.e. automatically handle async actions that affect metaInfo)
+            // credit for this suggestion goes to [Sébastien Chopin](https://github.com/Atinux)
+            this.$options.created = this.$options.created || []
+            this.$options.created.push(() => {
+              this.$watch('$metaInfo', () => triggerUpdate(this))
+            })
+          }
+        }
+
+        ['activated', 'deactivated', 'beforeMount'].forEach((lifecycleHook) => {
+          this.$options[lifecycleHook] = this.$options[lifecycleHook] || []
+          this.$options[lifecycleHook].push(() => triggerUpdate(this))
+        })
+
+        // do not trigger refresh on the server side
+        if (!this.$isServer) {
+          // re-render meta data when returning from a child component to parent
+          this.$options.destroyed = this.$options.destroyed || []
+          this.$options.destroyed.push(() => {
+            // Wait that element is hidden before refreshing meta tags (to support animations)
+            const interval = setInterval(() => {
+              if (this.$el && this.$el.offsetParent !== null) {
+                return
+              }
+
+              clearInterval(interval)
+
+              if (!this.$parent) {
+                return
+              }
+
+              triggerUpdate(this)
+            }, 50)
+          })
         }
-        this.$options.computed.$metaInfo = this.$options[options.keyName]
       }
-    },
+    }
-    created () {
+    /* Not yet removed
+    created() {
       // if computed $metaInfo exists, watch it for updates & trigger a refresh
       // when it changes (i.e. automatically handle async actions that affect metaInfo)
       // credit for this suggestion goes to [Sébastien Chopin](https://github.com/Atinux)
       if (!this.$isServer && this.$metaInfo) {
-        this.$watch('$metaInfo', () => {
+        this.$watch('$metaInfo', () => triggerUpdate(this))
-          // batch potential DOM updates to prevent extraneous re-rendering
-          batchID = batchUpdate(batchID, () => this.$meta().refresh())
-        })
       }
+
     },
-    activated () {
+    activated() {
       if (this._hasMetaInfo) {
-        // batch potential DOM updates to prevent extraneous re-rendering
+        triggerUpdate(this)
-        batchID = batchUpdate(batchID, () => this.$meta().refresh())
       }
     },
-    deactivated () {
+    deactivated() {
       if (this._hasMetaInfo) {
-        // batch potential DOM updates to prevent extraneous re-rendering
+        triggerUpdate(this)
-        batchID = batchUpdate(batchID, () => this.$meta().refresh())
       }
     },
-    beforeMount () {
+    beforeMount() {
-      // batch potential DOM updates to prevent extraneous re-rendering
       if (this._hasMetaInfo) {
-        batchID = batchUpdate(batchID, () => this.$meta().refresh())
+        triggerUpdate(this)
       }
     },
-    destroyed () {
+    destroyed() {
       // do not trigger refresh on the server side
-      if (this.$isServer) return
+      if (this.$isServer) {
+        return
+      }
+
       // re-render meta data when returning from a child component to parent
       if (this._hasMetaInfo) {
         // Wait that element is hidden before refreshing meta tags (to support animations)
         const interval = setInterval(() => {
-          if (this.$el && this.$el.offsetParent !== null) return
+          if (this.$el && this.$el.offsetParent !== null) {
+            return
+          }
+
           clearInterval(interval)
-          if (!this.$parent) return
+
-          batchID = batchUpdate(batchID, () => this.$meta().refresh())
+          if (!this.$parent) {
+            return
+          }
+
+          triggerUpdate(this)
         }, 50)
       }
-    }
+    }/**/
   })
 }

src/shared/uniqBy.js

@@ -1,4 +1,4 @@
-export default function uniqBy (inputArray, predicate) {
+export default function uniqBy(inputArray, predicate) {
   return inputArray
     .filter((x, i, arr) => i === arr.length - 1
       ? true

test/components.test.js

@@ -0,0 +1,79 @@
+import _getMetaInfo from '../src/shared/getMetaInfo'
+import { mount, defaultOptions, loadVueMetaPlugin } from './utils'
+
+import GoodbyeWorld from './fixtures/goodbye-world.vue'
+import HelloWorld from './fixtures/hello-world.vue'
+import KeepAlive from './fixtures/keep-alive.vue'
+
+const getMetaInfo = component => _getMetaInfo(defaultOptions, component)
+
+describe('client', () => {
+  let Vue
+
+  beforeAll(() => (Vue = loadVueMetaPlugin()))
+
+  test('meta-info refreshed on component\'s data change', () => {
+    const wrapper = mount(HelloWorld, { localVue: Vue })
+
+    let metaInfo = getMetaInfo(wrapper.vm)
+    expect(metaInfo.title).toEqual('Hello World')
+    wrapper.setData({ title: 'Goodbye World' })
+
+    metaInfo = getMetaInfo(wrapper.vm)
+    expect(metaInfo.title).toEqual('Goodbye World')
+  })
+
+  test('child meta-info removed when child is toggled', () => {
+    const wrapper = mount(GoodbyeWorld, { localVue: Vue })
+
+    let metaInfo = getMetaInfo(wrapper.vm)
+    expect(metaInfo.title).toEqual('Hello World')
+
+    wrapper.setData({ childVisible: false })
+
+    metaInfo = getMetaInfo(wrapper.vm)
+    expect(metaInfo.title).toEqual('Goodbye World')
+
+    wrapper.setData({ childVisible: true })
+
+    metaInfo = getMetaInfo(wrapper.vm)
+    expect(metaInfo.title).toEqual('Hello World')
+  })
+
+  test('child meta-info removed when keep-alive child is toggled', () => {
+    const wrapper = mount(KeepAlive, { localVue: Vue })
+
+    let metaInfo = getMetaInfo(wrapper.vm)
+    expect(metaInfo.title).toEqual('Hello World')
+
+    wrapper.setData({ childVisible: false })
+
+    metaInfo = getMetaInfo(wrapper.vm)
+    expect(metaInfo.title).toEqual('Alive World')
+
+    wrapper.setData({ childVisible: true })
+
+    metaInfo = getMetaInfo(wrapper.vm)
+    expect(metaInfo.title).toEqual('Hello World')
+  })
+
+  test('meta-info is removed when destroyed', () => {
+    const parentComponent = new Vue({ render: h => h('div') })
+    const wrapper = mount(HelloWorld, { localVue: Vue, parentComponent })
+
+    let metaInfo = getMetaInfo(wrapper.vm.$parent)
+    expect(metaInfo.title).toEqual('Hello World')
+    wrapper.destroy()
+
+    jest.runAllTimers()
+    metaInfo = getMetaInfo(wrapper.vm.$parent)
+    expect(metaInfo.title).toEqual('')
+  })
+
+  test('meta-info can be rendered with inject', () => {
+    const wrapper = mount(HelloWorld, { localVue: Vue })
+
+    const metaInfo = wrapper.vm.$meta().inject()
+    expect(metaInfo.title.text()).toEqual('<title data-vue-meta="true">Hello World</title>')
+  })
+})

test/fixtures/app.vue

@@ -0,0 +1,33 @@
+<template>
+  <html {{ head.headAttrs.text() }}>
+    <head></head>
+    bla
+  </html>
+</template>
+
+
+<script>
+export default {
+  metaInfo() {
+    return {
+      title: this.title
+    }
+  },
+  data() {
+    return {
+      title: 'Hello World',
+      htmlAttrs: {
+        lang: 'en'
+      },
+      meta: [
+        { charset: 'utf-8' }
+      ]
+    }
+  },
+  computed: {
+    head() {
+      return meta.inject()
+    }
+  }
+}
+</script>

test/fixtures/goodbye-world.vue

@@ -0,0 +1,26 @@
+<template>
+  <div>
+    <hello-world v-if="childVisible"></hello-world>
+  </div>
+</template>
+
+<script>
+import HelloWorld from './hello-world.vue'
+
+export default {
+  components: {
+    HelloWorld
+  },
+  metaInfo() {
+    return {
+      title: this.title,
+    }
+  },
+  data() {
+    return {
+      childVisible: true,
+      title: 'Goodbye World'
+    }
+  }
+}
+</script>

test/fixtures/hello-world.vue

@@ -0,0 +1,24 @@
+<template>
+  <div>Test</div>
+</template>
+
+<script>
+export default {
+  metaInfo() {
+    return {
+      title: this.title
+    }
+  },
+  data() {
+    return {
+      title: 'Hello World',
+      htmlAttrs: {
+        lang: 'en'
+      },
+      meta: [
+        { charset: 'utf-8' }
+      ]
+    }
+  }
+}
+</script>

test/fixtures/keep-alive.vue

@@ -0,0 +1,28 @@
+<template>
+  <div>
+    <keep-alive>
+      <hello-world v-if="childVisible"></hello-world>
+    </keep-alive>
+  </div>
+</template>
+
+<script>
+import HelloWorld from './hello-world.vue'
+
+export default {
+  components: {
+    HelloWorld
+  },
+  metaInfo() {
+    return {
+      title: this.title,
+    }
+  },
+  data() {
+    return {
+      childVisible: true,
+      title: 'Alive World'
+    }
+  }
+}
+</script>

test/generators.test.js

@@ -0,0 +1,61 @@
+import _generateServerInjector from '../src/server/generateServerInjector'
+import { defaultOptions } from './utils'
+import metaInfoData from './utils/meta-info-data'
+
+const generateServerInjector = (type, data) => _generateServerInjector(defaultOptions, type, data)
+
+describe('generators', () => {
+  Object.keys(metaInfoData).forEach((type) => {
+    const typeTests = metaInfoData[type]
+
+    const testCases = {
+      add: (tags) => {
+        let html = tags.text()
+
+        // ssr only returns the attributes, convert to full tag
+        if (['htmlAttrs', 'headAttrs', 'bodyAttrs'].includes(type)) {
+          html = `<${type.substr(0, 4)} ${html}>`
+        }
+
+        typeTests.add.expect.forEach((expected) => {
+          expect(html).toContain(expected)
+        })
+      }
+    }
+
+    describe(`${type} type tests`, () => {
+      Object.keys(typeTests).forEach((action) => {
+        const testInfo = typeTests[action]
+
+        // return when no test case available
+        if (!testCases[action] && !testInfo.test) {
+          return
+        }
+
+        const defaultTestFn = () => {
+          const tags = generateServerInjector(type, testInfo.data)
+          testCases[action](tags)
+          return tags
+        }
+
+        let testFn
+        if (testInfo.test) {
+          testFn = testInfo.test('server', defaultTestFn)
+
+          if (testFn === true) {
+            testFn = defaultTestFn
+          }
+        } else {
+          testFn = defaultTestFn
+        }
+
+        if (testFn && typeof testFn === 'function') {
+          test.only(`${action} a tag`, () => {
+            expect.hasAssertions()
+            testFn()
+          })
+        }
+      })
+    })
+  })
+})

test/getComponentOption.spec.js

@@ -1,76 +0,0 @@
-import Vue from 'vue'
-import getComponentOption from '../src/shared/getComponentOption'
-
-describe('getComponentOption', () => {
-  const container = document.createElement('div')
-  let component
-
-  afterEach(() => component.$destroy())
-
-  it('returns an empty object when no matching options are found', () => {
-    component = new Vue()
-    const mergedOption = getComponentOption({ component, option: 'noop' })
-    expect(mergedOption).to.eql({})
-  })
-
-  it('fetches the given option from the given component', () => {
-    component = new Vue({ someOption: 'foo' })
-    const mergedOption = getComponentOption({ component, option: 'someOption' })
-    expect(mergedOption).to.eql('foo')
-  })
-
-  it('calls a function option, injecting the component as context', () => {
-    component = new Vue({
-      name: 'foobar',
-      someFunc () {
-        return this.$options.name
-      }
-    })
-    const mergedOption = getComponentOption({ component, option: 'someFunc' })
-    expect(mergedOption).to.eql('foobar')
-  })
-
-  it('fetches deeply nested component options and merges them', () => {
-    Vue.component('merge-child', { template: '<div></div>', foo: { bar: 'baz' } })
-
-    component = new Vue({
-      foo: { fizz: 'buzz' },
-      render: (h) => h('div', null, [h('merge-child')]),
-      el: container
-    })
-
-    const mergedOption = getComponentOption({ component, option: 'foo', deep: true })
-    expect(mergedOption).to.eql({ bar: 'baz', fizz: 'buzz' })
-  })
-
-  it('allows for a custom array merge strategy', () => {
-    Vue.component('array-child', {
-      template: '<div></div>',
-      foo: [
-        { name: 'flower', content: 'rose' }
-      ]
-    })
-
-    component = new Vue({
-      render: (h) => h('div', null, [h('array-child')]),
-      foo: [
-        { name: 'flower', content: 'tulip' }
-      ],
-      el: container
-    })
-
-    const mergedOption = getComponentOption({
-      component,
-      option: 'foo',
-      deep: true,
-      arrayMerge (target, source) {
-        return target.concat(source)
-      }
-    })
-
-    expect(mergedOption).to.eql([
-      { name: 'flower', content: 'tulip' },
-      { name: 'flower', content: 'rose' }
-    ])
-  })
-})

test/getComponentOptions.test.js

@@ -0,0 +1,76 @@
+import getComponentOption from '../src/shared/getComponentOption'
+import { getVue } from './utils'
+
+describe('getComponentOption', () => {
+  let Vue
+
+  beforeAll(() => (Vue = getVue()))
+
+  it('returns an empty object when no matching options are found', () => {
+    const component = new Vue()
+    const mergedOption = getComponentOption({ component, keyName: 'noop' })
+    expect(mergedOption).toEqual({})
+  })
+
+  it('fetches the given option from the given component', () => {
+    const component = new Vue({ someOption: 'foo' })
+    const mergedOption = getComponentOption({ component, keyName: 'someOption' })
+    expect(mergedOption).toEqual('foo')
+  })
+
+  it('calls a function option, injecting the component as context', () => {
+    const component = new Vue({
+      name: 'Foobar',
+      someFunc() {
+        return this.$options.name
+      }
+    })
+    const mergedOption = getComponentOption({ component, keyName: 'someFunc' })
+    // TODO: Should this be foobar or Foobar
+    expect(mergedOption).toEqual('Foobar')
+  })
+
+  it('fetches deeply nested component options and merges them', () => {
+    Vue.component('merge-child', { render: h => h('div'), foo: { bar: 'baz' } })
+
+    const component = new Vue({
+      foo: { fizz: 'buzz' },
+      el: document.createElement('div'),
+      render: h => h('div', null, [h('merge-child')])
+    })
+
+    const mergedOption = getComponentOption({ component, keyName: 'foo', deep: true })
+    expect(mergedOption).toEqual({ bar: 'baz', fizz: 'buzz' })
+  })
+
+  it('allows for a custom array merge strategy', () => {
+    Vue.component('array-child', {
+      render: h => h('div'),
+      foo: [
+        { name: 'flower', content: 'rose' }
+      ]
+    })
+
+    const component = new Vue({
+      foo: [
+        { name: 'flower', content: 'tulip' }
+      ],
+      el: document.createElement('div'),
+      render: h => h('div', null, [h('array-child')])
+    })
+
+    const mergedOption = getComponentOption({
+      component,
+      keyName: 'foo',
+      deep: true,
+      arrayMerge(target, source) {
+        return target.concat(source)
+      }
+    })
+
+    expect(mergedOption).toEqual([
+      { name: 'flower', content: 'tulip' },
+      { name: 'flower', content: 'rose' }
+    ])
+  })
+})

test/getMetaInfo.test.js

@@ -1,35 +1,17 @@
-import Vue from 'vue'
 import _getMetaInfo from '../src/shared/getMetaInfo'
-import {
+import { defaultOptions, loadVueMetaPlugin } from './utils'
-  VUE_META_ATTRIBUTE,
-  VUE_META_CONTENT_KEY,
-  VUE_META_KEY_NAME,
-  VUE_META_SERVER_RENDERED_ATTRIBUTE,
-  VUE_META_TAG_LIST_ID_KEY_NAME,
-  VUE_META_TEMPLATE_KEY_NAME
-} from '../src/shared/constants'
 
-// set some default options
+const getMetaInfo = component => _getMetaInfo(defaultOptions, component)
-const defaultOptions = {
-  keyName: VUE_META_KEY_NAME,
-  attribute: VUE_META_ATTRIBUTE,
-  ssrAttribute: VUE_META_SERVER_RENDERED_ATTRIBUTE,
-  metaTemplateKeyName: VUE_META_TEMPLATE_KEY_NAME,
-  contentKeyName: VUE_META_CONTENT_KEY,
-  tagIDKeyName: VUE_META_TAG_LIST_ID_KEY_NAME
-}
-
-const getMetaInfo = _getMetaInfo(defaultOptions)
 
 describe('getMetaInfo', () => {
-  // const container = document.createElement('div')
+  let Vue
-  let component
 
-  afterEach(() => component.$destroy())
+  beforeAll(() => (Vue = loadVueMetaPlugin()))
 
-  it('returns appropriate defaults when no meta info is found', () => {
+  test('returns appropriate defaults when no meta info is found', () => {
-    component = new Vue()
+    const component = new Vue()
-    expect(getMetaInfo(component)).to.eql({
+
+    expect(getMetaInfo(component)).toEqual({
       title: '',
       titleChunk: '',
       titleTemplate: '%s',
@@ -47,8 +29,8 @@ describe('getMetaInfo', () => {
     })
   })
 
-  it('returns metaInfo when used in component', () => {
+  test('returns metaInfo when used in component', () => {
-    component = new Vue({
+    const component = new Vue({
       metaInfo: {
         title: 'Hello',
         meta: [
@@ -56,7 +38,8 @@ describe('getMetaInfo', () => {
         ]
       }
     })
-    expect(getMetaInfo(component)).to.eql({
+
+    expect(getMetaInfo(component)).toEqual({
       title: 'Hello',
       titleChunk: 'Hello',
       titleTemplate: '%s',
@@ -75,8 +58,37 @@ describe('getMetaInfo', () => {
       __dangerouslyDisableSanitizersByTagID: {}
     })
   })
-  it('removes duplicate metaInfo in same component', () => {
+
-    component = new Vue({
+  test('converts base tag to array', () => {
+    const component = new Vue({
+      metaInfo: {
+        title: 'Hello',
+        base: { href: 'href' }
+      }
+    })
+
+    expect(getMetaInfo(component)).toEqual({
+      title: 'Hello',
+      titleChunk: 'Hello',
+      titleTemplate: '%s',
+      htmlAttrs: {},
+      headAttrs: {},
+      bodyAttrs: {},
+      meta: [],
+      base: [
+        { href: 'href' }
+      ],
+      link: [],
+      style: [],
+      script: [],
+      noscript: [],
+      __dangerouslyDisableSanitizers: [],
+      __dangerouslyDisableSanitizersByTagID: {}
+    })
+  })
+
+  test('removes duplicate metaInfo in same component', () => {
+    const component = new Vue({
       metaInfo: {
         title: 'Hello',
         meta: [
@@ -93,7 +105,8 @@ describe('getMetaInfo', () => {
         ]
       }
     })
-    expect(getMetaInfo(component)).to.eql({
+
+    expect(getMetaInfo(component)).toEqual({
       title: 'Hello',
       titleChunk: 'Hello',
       titleTemplate: '%s',
@@ -117,8 +130,8 @@ describe('getMetaInfo', () => {
     })
   })
 
-  it('properly uses string titleTemplates', () => {
+  test('properly uses string titleTemplates', () => {
-    component = new Vue({
+    const component = new Vue({
       metaInfo: {
         title: 'Hello',
         titleTemplate: '%s World',
@@ -127,7 +140,8 @@ describe('getMetaInfo', () => {
         ]
       }
     })
-    expect(getMetaInfo(component)).to.eql({
+
+    expect(getMetaInfo(component)).toEqual({
       title: 'Hello World',
       titleChunk: 'Hello',
       titleTemplate: '%s World',
@@ -147,10 +161,10 @@ describe('getMetaInfo', () => {
     })
   })
 
-  it('properly uses function titleTemplates', () => {
+  test('properly uses function titleTemplates', () => {
     const titleTemplate = chunk => `${chunk} Function World`
 
-    component = new Vue({
+    const component = new Vue({
       metaInfo: {
         title: 'Hello',
         titleTemplate,
@@ -159,7 +173,8 @@ describe('getMetaInfo', () => {
         ]
       }
     })
-    expect(getMetaInfo(component)).to.eql({
+
+    expect(getMetaInfo(component)).toEqual({
       title: 'Hello Function World',
       titleChunk: 'Hello',
       titleTemplate,
@@ -179,12 +194,12 @@ describe('getMetaInfo', () => {
     })
   })
 
-  it('has the proper `this` binding when using function titleTemplates', () => {
+  test('has the proper `this` binding when using function titleTemplates', () => {
     const titleTemplate = function (chunk) {
       return `${chunk} ${this.helloWorldText}`
     }
 
-    component = new Vue({
+    const component = new Vue({
       metaInfo: {
         title: 'Hello',
         titleTemplate,
@@ -192,13 +207,14 @@ describe('getMetaInfo', () => {
           { charset: 'utf-8' }
         ]
       },
-      data () {
+      data() {
         return {
           helloWorldText: 'Function World'
         }
       }
     })
-    expect(getMetaInfo(component)).to.eql({
+
+    expect(getMetaInfo(component)).toEqual({
       title: 'Hello Function World',
       titleChunk: 'Hello',
       titleTemplate,
@@ -218,8 +234,8 @@ describe('getMetaInfo', () => {
     })
   })
 
-  it('properly uses string meta templates', () => {
+  test('properly uses string meta templates', () => {
-    component = new Vue({
+    const component = new Vue({
       metaInfo: {
         title: 'Hello',
         meta: [
@@ -232,7 +248,8 @@ describe('getMetaInfo', () => {
         ]
       }
     })
-    expect(getMetaInfo(component)).to.eql({
+
+    expect(getMetaInfo(component)).toEqual({
       title: 'Hello',
       titleChunk: 'Hello',
       titleTemplate: '%s',
@@ -256,8 +273,8 @@ describe('getMetaInfo', () => {
     })
   })
 
-  it('properly uses function meta templates', () => {
+  test('properly uses function meta templates', () => {
-    component = new Vue({
+    const component = new Vue({
       metaInfo: {
         title: 'Hello',
         meta: [
@@ -270,7 +287,8 @@ describe('getMetaInfo', () => {
         ]
       }
     })
-    expect(getMetaInfo(component)).to.eql({
+
+    expect(getMetaInfo(component)).toEqual({
       title: 'Hello',
       titleChunk: 'Hello',
       titleTemplate: '%s',
@@ -294,8 +312,8 @@ describe('getMetaInfo', () => {
     })
   })
 
-  it('properly uses content only if template is not defined', () => {
+  test('properly uses content only if template is not defined', () => {
-    component = new Vue({
+    const component = new Vue({
       metaInfo: {
         title: 'Hello',
         meta: [
@@ -307,7 +325,8 @@ describe('getMetaInfo', () => {
         ]
       }
     })
-    expect(getMetaInfo(component)).to.eql({
+
+    expect(getMetaInfo(component)).toEqual({
       title: 'Hello',
       titleChunk: 'Hello',
       titleTemplate: '%s',
@@ -331,8 +350,8 @@ describe('getMetaInfo', () => {
     })
   })
 
-  it('properly uses content only if template is null', () => {
+  test('properly uses content only if template is null', () => {
-    component = new Vue({
+    const component = new Vue({
       metaInfo: {
         title: 'Hello',
         meta: [
@@ -345,7 +364,8 @@ describe('getMetaInfo', () => {
         ]
       }
     })
-    expect(getMetaInfo(component)).to.eql({
+
+    expect(getMetaInfo(component)).toEqual({
       title: 'Hello',
       titleChunk: 'Hello',
       titleTemplate: '%s',
@@ -369,8 +389,8 @@ describe('getMetaInfo', () => {
     })
   })
 
-  it('properly uses content only if template is false', () => {
+  test('properly uses content only if template is false', () => {
-    component = new Vue({
+    const component = new Vue({
       metaInfo: {
         title: 'Hello',
         meta: [
@@ -383,7 +403,8 @@ describe('getMetaInfo', () => {
         ]
       }
     })
-    expect(getMetaInfo(component)).to.eql({
+
+    expect(getMetaInfo(component)).toEqual({
       title: 'Hello',
       titleChunk: 'Hello',
       titleTemplate: '%s',
@@ -407,9 +428,9 @@ describe('getMetaInfo', () => {
     })
   })
 
-  it('properly uses meta templates with one-level-deep nested children content', () => {
+  test('properly uses meta templates with one-level-deep nested children content', () => {
     Vue.component('merge-child', {
-      template: '<div></div>',
+      render: h => h('div'),
       metaInfo: {
         title: 'Hello',
         meta: [
@@ -422,7 +443,7 @@ describe('getMetaInfo', () => {
       }
     })
 
-    component = new Vue({
+    const component = new Vue({
       metaInfo: {
         meta: [
           {
@@ -433,11 +454,11 @@ describe('getMetaInfo', () => {
           }
         ]
       },
-      render: (h) => h('div', null, [h('merge-child')]),
+      el: document.createElement('div'),
-      el: document.createElement('div')
+      render: h => h('div', null, [h('merge-child')])
     })
 
-    expect(getMetaInfo(component)).to.eql({
+    expect(getMetaInfo(component)).toEqual({
       title: 'Hello',
       titleChunk: 'Hello',
       titleTemplate: '%s',
@@ -463,9 +484,9 @@ describe('getMetaInfo', () => {
 
   // TODO: Still failing :( Child template won't be applied if child has no content as well
 
-  it('properly uses meta templates with one-level-deep nested children template', () => {
+  test('properly uses meta templates with one-level-deep nested children template', () => {
     Vue.component('merge-child', {
-      template: '<div></div>',
+      render: h => h('div'),
       metaInfo: {
         title: 'Hello',
         meta: [
@@ -478,7 +499,7 @@ describe('getMetaInfo', () => {
       }
     })
 
-    component = new Vue({
+    const component = new Vue({
       metaInfo: {
         meta: [
           {
@@ -489,11 +510,11 @@ describe('getMetaInfo', () => {
           }
         ]
       },
-      render: (h) => h('div', null, [h('merge-child')]),
+      el: document.createElement('div'),
-      el: document.createElement('div')
+      render: h => h('div', null, [h('merge-child')])
     })
 
-    expect(getMetaInfo(component)).to.eql({
+    expect(getMetaInfo(component)).toEqual({
       title: 'Hello',
       titleChunk: 'Hello',
       titleTemplate: '%s',
@@ -517,9 +538,9 @@ describe('getMetaInfo', () => {
     })
   })
 
-  it('properly uses meta templates with one-level-deep nested children template and content', () => {
+  test('properly uses meta templates with one-level-deep nested children template and content', () => {
     Vue.component('merge-child', {
-      template: '<div></div>',
+      render: h => h('div'),
       metaInfo: {
         title: 'Hello',
         meta: [
@@ -533,7 +554,7 @@ describe('getMetaInfo', () => {
       }
     })
 
-    component = new Vue({
+    const component = new Vue({
       metaInfo: {
         meta: [
           {
@@ -544,11 +565,11 @@ describe('getMetaInfo', () => {
           }
         ]
       },
-      render: (h) => h('div', null, [h('merge-child')]),
+      el: document.createElement('div'),
-      el: document.createElement('div')
+      render: h => h('div', null, [h('merge-child')])
     })
 
-    expect(getMetaInfo(component)).to.eql({
+    expect(getMetaInfo(component)).toEqual({
       title: 'Hello',
       titleChunk: 'Hello',
       titleTemplate: '%s',

test/index.js

@@ -1,4 +0,0 @@
-const testsContext = require.context('.', true, /\.spec$/)
-const srcContext = require.context('../src', true, /\.js$/)
-testsContext.keys().forEach(testsContext)
-srcContext.keys().forEach(srcContext)

test/plugin.spec.js

@@ -1,33 +0,0 @@
-import Vue from 'vue'
-import VueMeta from '../src/shared/plugin'
-import {
-  VUE_META_KEY_NAME,
-  VUE_META_ATTRIBUTE,
-  VUE_META_SERVER_RENDERED_ATTRIBUTE,
-  VUE_META_TAG_LIST_ID_KEY_NAME
-} from '../src/shared/constants'
-
-describe('plugin', () => {
-  Vue.use(VueMeta, {
-    keyName: VUE_META_KEY_NAME,
-    attribute: VUE_META_ATTRIBUTE,
-    ssrAttribute: VUE_META_SERVER_RENDERED_ATTRIBUTE,
-    tagIDKeyName: VUE_META_TAG_LIST_ID_KEY_NAME
-  })
-
-  it('adds $meta() to Vue prototype', () => {
-    const instance = new Vue()
-    expect(instance.$meta).to.be.a('function')
-  })
-
-  it('components have _hasMetaInfo set to true', () => {
-    const Component = Vue.component('test-component', {
-      template: '<div>Test</div>',
-      [VUE_META_KEY_NAME]: {
-        title: 'helloworld'
-      }
-    })
-    const vm = new Vue(Component).$mount()
-    expect(vm._hasMetaInfo).to.equal(true)
-  })
-})

test/plugin.test.js

@@ -0,0 +1,32 @@
+import { mount, defaultOptions, VueMetaPlugin, loadVueMetaPlugin } from './utils'
+
+jest.mock('../package.json', () => ({
+  version: 'test-version'
+}))
+
+describe('plugin', () => {
+  let Vue
+
+  beforeAll(() => (Vue = loadVueMetaPlugin()))
+
+  test('is loaded', () => {
+    const instance = new Vue()
+    expect(instance.$meta).toEqual(expect.any(Function))
+  })
+
+  test('component has _hasMetaInfo set to true', () => {
+    const Component = Vue.component('test-component', {
+      template: '<div>Test</div>',
+      [defaultOptions.keyName]: {
+        title: 'Hello World'
+      }
+    })
+
+    const { vm } = mount(Component, { localVue: Vue })
+    expect(vm._hasMetaInfo).toBe(true)
+  })
+
+  test('plugin sets package version', () => {
+    expect(VueMetaPlugin.version).toBe('test-version')
+  })
+})

test/updaters.test.js

@@ -0,0 +1,97 @@
+import _updateClientMetaInfo from '../src/client/updateClientMetaInfo'
+import { defaultOptions } from './utils'
+import metaInfoData from './utils/meta-info-data'
+
+const updateClientMetaInfo = (type, data) => _updateClientMetaInfo(defaultOptions, { [type]: data })
+
+describe('updaters', () => {
+  let html
+
+  beforeAll(() => {
+    html = document.getElementsByTagName('html')[0]
+
+    // remove default meta charset
+    Array.from(html.getElementsByTagName('meta')).forEach(el => el.parentNode.removeChild(el))
+  })
+
+  Object.keys(metaInfoData).forEach((type) => {
+    const typeTests = metaInfoData[type]
+
+    const testCases = {
+      add: (tags) => {
+        typeTests.add.expect.forEach((expected, index) => {
+          if (!['title', 'htmlAttrs', 'headAttrs', 'bodyAttrs'].includes(type)) {
+            expect(tags.addedTags[type][index].outerHTML).toBe(expected)
+          }
+          expect(html.outerHTML).toContain(expected)
+        })
+      },
+      change: (tags) => {
+        typeTests.add.expect.forEach((expected, index) => {
+          if (!typeTests.change.expect.includes(expected)) {
+            expect(html.outerHTML).not.toContain(expected)
+          }
+        })
+
+        typeTests.change.expect.forEach((expected, index) => {
+          if (!['title', 'htmlAttrs', 'headAttrs', 'bodyAttrs'].includes(type)) {
+            expect(tags.addedTags[type][index].outerHTML).toBe(expected)
+          }
+          expect(html.outerHTML).toContain(expected)
+        })
+      },
+      remove: (tags) => {
+        // TODO: i'd expect tags.removedTags to be populated
+
+        typeTests.add.expect.forEach((expected, index) => {
+          expect(html.outerHTML).not.toContain(expected)
+        })
+
+        typeTests.change.expect.forEach((expected, index) => {
+          expect(html.outerHTML).not.toContain(expected)
+        })
+
+        expect(html.outerHTML).not.toContain(`<${type}`)
+      }
+    }
+
+    describe(`${type} type tests`, () => {
+      Object.keys(typeTests).forEach((action) => {
+        const testInfo = typeTests[action]
+
+        // return when no test case available
+        if (!testCases[action] && !testInfo.test) {
+          return
+        }
+
+        const defaultTestFn = () => {
+          const tags = updateClientMetaInfo(type, testInfo.data)
+
+          if (testCases[action]) {
+            testCases[action](tags)
+          }
+
+          return tags
+        }
+
+        let testFn
+        if (testInfo.test) {
+          testFn = testInfo.test('client', defaultTestFn)
+
+          if (testFn === true) {
+            testFn = defaultTestFn
+          }
+        } else {
+          testFn = defaultTestFn
+        }
+
+        if (testFn && typeof testFn === 'function') {
+          test.only(`${action} a tag`, () => {
+            expect.hasAssertions()
+            testFn()
+          })
+        }
+      })
+    })
+  })
+})

test/utils/index.js

@@ -0,0 +1,37 @@
+import { mount, createLocalVue } from '@vue/test-utils'
+import { renderToString } from '@vue/server-test-utils'
+import VueMetaPlugin from '../../src'
+
+import {
+  VUE_META_ATTRIBUTE,
+  VUE_META_CONTENT_KEY,
+  VUE_META_KEY_NAME,
+  VUE_META_SERVER_RENDERED_ATTRIBUTE,
+  VUE_META_TAG_LIST_ID_KEY_NAME,
+  VUE_META_TEMPLATE_KEY_NAME
+} from '../../src/shared/constants'
+
+export {
+  mount,
+  renderToString,
+  VueMetaPlugin
+}
+
+export const defaultOptions = {
+  keyName: VUE_META_KEY_NAME,
+  attribute: VUE_META_ATTRIBUTE,
+  ssrAttribute: VUE_META_SERVER_RENDERED_ATTRIBUTE,
+  metaTemplateKeyName: VUE_META_TEMPLATE_KEY_NAME,
+  contentKeyName: VUE_META_CONTENT_KEY,
+  tagIDKeyName: VUE_META_TAG_LIST_ID_KEY_NAME
+}
+
+export function getVue() {
+  return createLocalVue()
+}
+
+export function loadVueMetaPlugin(options, localVue = getVue()) {
+  localVue.use(VueMetaPlugin, Object.assign({}, defaultOptions, options))
+
+  return localVue
+}

test/utils/meta-info-data.js

@@ -0,0 +1,216 @@
+import { defaultOptions } from './'
+
+const metaInfoData = {
+  title: {
+    add: {
+      data: 'Hello World',
+      expect: ['<title data-vue-meta="true">Hello World</title>'],
+      test(side, defaultTest) {
+        if (side === 'client') {
+          // client side vue-meta uses document.title and doesnt change the html
+          return () => {
+            this.expect[0] = '<title>Hello World</title>'
+            const spy = jest.spyOn(document, 'title', 'set')
+
+            defaultTest()
+
+            expect(spy).toHaveBeenCalledTimes(1)
+            expect(spy).toHaveBeenCalledWith('Hello World')
+          }
+        } else {
+          return defaultTest
+        }
+      }
+    }
+  },
+  base: {
+    add: {
+      data: [{ href: 'href' }],
+      expect: ['<base data-vue-meta="true" href="href">']
+    },
+    change: {
+      data: [{ href: 'href2' }],
+      expect: ['<base data-vue-meta="true" href="href2">']
+    },
+    remove: {
+      data: [],
+      expect: ['']
+    }
+  },
+  meta: {
+    add: {
+      data: [{ charset: 'utf-8' }, { property: 'a', content: 'a' }],
+      expect: [
+        '<meta data-vue-meta="true" charset="utf-8">',
+        '<meta data-vue-meta="true" property="a" content="a">'
+      ]
+    },
+    change: {
+      data: [
+        { charset: 'utf-16' },
+        { property: 'a', content: 'b' }
+      ],
+      expect: [
+        '<meta data-vue-meta="true" charset="utf-16">',
+        '<meta data-vue-meta="true" property="a" content="b">'
+      ]
+    },
+    // make sure elements that already exists are not unnecessarily updated
+    duplicate: {
+      data: [
+        { charset: 'utf-16' },
+        { property: 'a', content: 'c' }
+      ],
+      expect: [
+        '<meta data-vue-meta="true" charset="utf-16">',
+        '<meta data-vue-meta="true" property="a" content="c">'
+      ],
+      test(side, defaultTest) {
+        if (side === 'client') {
+          return () => {
+            const tags = defaultTest()
+
+            expect(tags.addedTags.meta.length).toBe(1)
+            // TODO: not sure if we really expect this
+            expect(tags.removedTags.meta.length).toBe(1)
+          }
+        }
+      }
+    },
+    remove: {
+      data: [],
+      expect: ['']
+    }
+  },
+  link: {
+    add: {
+      data: [{ rel: 'stylesheet', href: 'href' }],
+      expect: ['<link data-vue-meta="true" rel="stylesheet" href="href">']
+    },
+    change: {
+      data: [{ rel: 'stylesheet', href: 'href', media: 'screen' }],
+      expect: ['<link data-vue-meta="true" rel="stylesheet" href="href" media="screen">']
+    },
+    remove: {
+      data: [],
+      expect: ['']
+    }
+  },
+  style: {
+    add: {
+      data: [{ type: 'text/css', cssText: '.foo { color: red; }' }],
+      expect: ['<style data-vue-meta="true" type="text/css">.foo { color: red; }</style>']
+    },
+    change: {
+      data: [{ type: 'text/css', cssText: '.foo { color: blue; }' }],
+      expect: ['<style data-vue-meta="true" type="text/css">.foo { color: blue; }</style>']
+    },
+    remove: {
+      data: [],
+      expect: ['']
+    }
+  },
+  script: {
+    add: {
+      data: [
+        { src: 'src', async: true, defer: true, [defaultOptions.tagIDKeyName]: 'content' },
+        { src: 'src', async: true, defer: true, body: true }
+      ],
+      expect: [
+        '<script data-vue-meta="true" src="src" async="true" defer="true" data-vmid="content"></script>',
+        '<script data-vue-meta="true" src="src" async="true" defer="true" data-body="true"></script>'
+      ],
+      test(side, defaultTest) {
+        return () => {
+          if (side === 'client') {
+            const tags = defaultTest()
+
+            expect(tags.addedTags.script[0].parentNode.tagName).toBe('HEAD')
+            expect(tags.addedTags.script[1].parentNode.tagName).toBe('BODY')
+          } else {
+            // ssr doesnt generate data-body tags
+            const bodyScript = this.expect[1]
+            this.expect = [this.expect[0]]
+
+            const tags = defaultTest()
+
+            expect(tags.text()).not.toContain(bodyScript)
+          }
+        }
+      }
+    },
+    change: {
+      data: [{ src: 'src', async: true, defer: true, [defaultOptions.tagIDKeyName]: 'content2' }],
+      expect: ['<script data-vue-meta="true" src="src" async="true" defer="true" data-vmid="content2"></script>']
+    },
+    remove: {
+      data: [],
+      expect: ['']
+    }
+  },
+  noscript: {
+    add: {
+      data: [{ innerHTML: '<p>noscript</p>' }],
+      expect: ['<noscript data-vue-meta="true"><p>noscript</p></noscript>']
+    },
+    change: {
+      data: [{ innerHTML: '<p>noscript, no really</p>' }],
+      expect: ['<noscript data-vue-meta="true"><p>noscript, no really</p></noscript>']
+    },
+    remove: {
+      data: [],
+      expect: ['']
+    }
+  },
+  htmlAttrs: {
+    add: {
+      data: { foo: 'bar' },
+      expect: ['<html foo="bar" data-vue-meta="foo">']
+    },
+    change: {
+      data: { foo: 'baz' },
+      expect: ['<html foo="baz" data-vue-meta="foo">']
+    },
+    remove: {
+      data: {},
+      expect: ['<html>']
+    }
+  },
+  headAttrs: {
+    add: {
+      data: { foo: 'bar' },
+      expect: ['<head foo="bar" data-vue-meta="foo">']
+    },
+    change: {
+      data: { foo: 'baz' },
+      expect: ['<head foo="baz" data-vue-meta="foo">']
+    },
+    remove: {
+      data: {},
+      expect: ['<head>']
+    }
+  },
+  bodyAttrs: {
+    add: {
+      data: { foo: 'bar' },
+      expect: ['<body foo="bar" data-vue-meta="foo">']
+    },
+    change: {
+      data: { foo: 'baz' },
+      expect: ['<body foo="baz" data-vue-meta="foo">']
+    },
+    remove: {
+      data: {},
+      expect: ['<body>']
+    }
+  },
+  empty: {
+    add: {
+      data: [{}],
+      expect: [''],
+      test: side => side === 'server'
+    }
+  }
+}
+
+export default metaInfoData

test/utils/setup.js

@@ -0,0 +1,5 @@
+import jsdom from 'jsdom-global'
+
+jsdom()
+
+jest.useFakeTimers()