Consistent parens in arrow functions (#3630)

* Minor consistency enhancements

* Arrow parenthesis consistency

* Change linting rule

* Fix typo

* Update .eslintrc.js to only require parens for blocks

* Update style according to brace-only suggestion

* Remove --fix from lint

* Tweak no-loading time (failing test)

* Tweak no-loading time (failing test) (2)

* Tweak no-loading time (failing test) (3)

* Tweak no-loading time (failing test) (4)

* Tweak no-loading time (failing test) (5)

.eslintrc.js

@@ -38,8 +38,8 @@ module.exports = {
     // Allow unresolved imports
     'import/no-unresolved': 0,
 
-    // Allow paren-less arrow functions
-    'arrow-parens': 0,
+    // Allow paren-less arrow functions only when there's no braces
+    'arrow-parens': [2, 'as-needed', { requireForBlockBody: true }],
 
     // Allow async-await
     'generator-star-spacing': 0,

bin/common/utils.js

@@ -16,7 +16,7 @@ const getNuxtConfigFile = argv => resolve(getRootDir(argv), argv['config-file'])
 
 exports.nuxtConfigFile = getNuxtConfigFile
 
-exports.loadNuxtConfig = argv => {
+exports.loadNuxtConfig = (argv) => {
   const rootDir = getRootDir(argv)
   const nuxtConfigFile = getNuxtConfigFile(argv)
 
@@ -46,7 +46,7 @@ exports.loadNuxtConfig = argv => {
   return options
 }
 
-exports.getLatestHost = argv => {
+exports.getLatestHost = (argv) => {
   const port =
     argv.port || process.env.PORT || process.env.npm_package_config_nuxt_port
   const host =

examples/async-component-injection/pages/_slug.vue

@@ -6,7 +6,7 @@
 
 <script>
 // See https://vuejs.org/v2/guide/components.html#Advanced-Async-Components
-const getPost = (slug) => ({
+const getPost = slug => ({
   component: import(`@/posts/${slug}`),
   error: require('@/posts/404')
 })

examples/coffeescript/modules/coffeescript.js

@@ -6,7 +6,7 @@ export default function () {
     test: /\.coffee$/,
     loader: 'coffee-loader'
   }
-  this.extendBuild(config => {
+  this.extendBuild((config) => {
     // Add CoffeeScruot loader
     config.module.rules.push(coffeeLoader)
     // Add .coffee extension in webpack resolve

examples/dynamic-components/pages/index.vue

@@ -16,7 +16,7 @@ const components = {
   vText: () => import('@/components/text.vue' /* webpackChunkName: "components/text" */),
   vImage: () => import('@/components/image.vue' /* webpackChunkName: "components/image" */),
   vCode: () => import('@/components/code.vue' /* webpackChunkName: "components/code" */),
-  vChart: () => import('@/components/chart.js' /* webpackChunkName: "components/chart" */).then((m) => m.default())
+  vChart: () => import('@/components/chart.js' /* webpackChunkName: "components/chart" */).then(m => m.default())
 }
 
 export default {

examples/dynamic-components/pages/ssr.vue

@@ -17,7 +17,7 @@ const components = {
   vText: () => import('@/components/text.vue' /* webpackChunkName: "components/text" */),
   vImage: () => import('@/components/image.vue' /* webpackChunkName: "components/image" */),
   vCode: () => import('@/components/code.vue' /* webpackChunkName: "components/code" */),
-  vChart: () => import('@/components/chart.js' /* webpackChunkName: "components/chart" */).then((m) => m.default())
+  vChart: () => import('@/components/chart.js' /* webpackChunkName: "components/chart" */).then(m => m.default())
 }
 
 export default {

examples/layout-transitions/pages/users.vue

@@ -22,7 +22,7 @@ export default {
   // Watch for $route.query.page to call Component methods (asyncData, fetch, validate, layout, etc.)
   watchQuery: ['page'],
   // Key for <nuxt-child> (transitions)
-  key: (to) => to.fullPath,
+  key: to => to.fullPath,
   // Called to know which transition to apply
   transition(to, from) {
     if (!from) return 'slide-left'

examples/nested-components/pages/index.vue

@@ -24,7 +24,7 @@
 <script>
 import Post from '~/components/post'
 import vP from '~/components/paragraph'
-const vHr = { render: (h) => h('hr', { class: 'hr' }) }
+const vHr = { render: h => h('hr', { class: 'hr' }) }
 
 export default {
   components: {

examples/nested-routes/pages/index/_id.vue

@@ -11,7 +11,7 @@ export default {
     return !isNaN(+params.id)
   },
   asyncData({ params, env, error }) {
-    const user = env.users.find((user) => String(user.id) === params.id)
+    const user = env.users.find(user => String(user.id) === params.id)
     if (!user) {
       return error({ message: 'User not found', statusCode: 404 })
     }

examples/routes-transitions/pages/users.vue

@@ -22,7 +22,7 @@ export default {
   // Watch for $route.query.page to call Component methods (asyncData, fetch, validate, layout, etc.)
   watchQuery: ['page'],
   // Key for <nuxt-child> (transitions)
-  key: (to) => to.fullPath,
+  key: to => to.fullPath,
   // Called to know which transition to apply
   transition(to, from) {
     if (!from) return 'slide-left'

examples/scroll-behavior/pages/users.vue

@@ -22,7 +22,7 @@ export default {
   // Watch for $route.query.page to call Component methods (asyncData, fetch, validate, layout, etc.)
   watchQuery: ['page'],
   // Key for <nuxt-child> (transitions)
-  key: (to) => to.fullPath,
+  key: to => to.fullPath,
   // Called to know which transition to apply
   transition(to, from) {
     if (!from) return 'slide-left'

examples/storybook/stories/collection.story.js

@@ -103,7 +103,7 @@ storiesOf('Features/Method for rendering Vue', module)
   }))
 
 storiesOf('Features/Decorator for Vue', module)
-  .addDecorator(story => {
+  .addDecorator((story) => {
     // Decorated with story function
     const WrapButton = story()
     return {
@@ -142,7 +142,7 @@ storiesOf('Features/Addon Actions', module)
   .add('Action and method', () => ({
     template: '<my-button :handle-click="log">Click me to log the action</my-button>',
     methods: {
-      log: e => {
+      log: (e) => {
         e.preventDefault()
         action('log2')(e.target)
       }

examples/typescript/modules/typescript.js

@@ -2,7 +2,7 @@ export default function () {
   // Add .ts extension for store, middleware and more
   this.nuxt.options.extensions.push('ts')
   // Extend build
-  this.extendBuild(config => {
+  this.extendBuild((config) => {
     const tsLoader = {
       loader: 'ts-loader',
       options: {

examples/vue-chartjs/pages/contributors.vue

@@ -22,7 +22,7 @@ export default {
     const res = await axios.get(`https://api.github.com/repos/nuxt/nuxt.js/stats/contributors?access_token=${env.githubToken}`)
     return {
       doughnutChartData: {
-        labels: res.data.map((stat) => stat.author.login),
+        labels: res.data.map(stat => stat.author.login),
         datasets: [
           {
             label: 'Nuxt.js Contributors',

examples/vue-chartjs/pages/index.vue

@@ -14,12 +14,12 @@ export default {
     const res = await axios.get(`https://api.github.com/repos/nuxt/nuxt.js/stats/commit_activity?access_token=${env.githubToken}`)
     return {
       barChartData: {
-        labels: res.data.map((stat) => moment(stat.week * 1000).format('GGGG[-W]WW')),
+        labels: res.data.map(stat => moment(stat.week * 1000).format('GGGG[-W]WW')),
         datasets: [
           {
             label: 'Nuxt.js Commit Activity',
             backgroundColor: '#41b883',
-            data: res.data.map((stat) => stat.total)
+            data: res.data.map(stat => stat.total)
           }
         ]
       }

examples/vuex-persistedstate/store/index.js

@@ -5,8 +5,8 @@ export const state = () => ({
 })
 
 export const mutations = {
-  increment: (state) => state.counter++,
-  decrement: (state) => state.counter--
+  increment: state => state.counter++,
+  decrement: state => state.counter--
 }
 
 export const plugins = [

examples/with-ava/test/index.test.js

@@ -19,14 +19,14 @@ test.before(async () => {
 }, 30000)
 
 // Example of testing only generated html
-test('Route / exits and render HTML', async t => {
+test('Route / exits and render HTML', async (t) => {
   const context = {}
   const { html } = await nuxt.renderRoute('/', context)
   t.true(html.includes('<h1 class="red">Hello world!</h1>'))
 })
 
 // Example of testing via dom checking
-test('Route / exits and render HTML with CSS applied', async t => {
+test('Route / exits and render HTML with CSS applied', async (t) => {
   const context = {}
   const { html } = await nuxt.renderRoute('/', context)
   const { window } = new JSDOM(html).window
@@ -38,6 +38,6 @@ test('Route / exits and render HTML with CSS applied', async t => {
 })
 
 // Close server and ask nuxt to stop listening to file changes
-test.after('Closing server and nuxt.js', t => {
+test.after('Closing server and nuxt.js', (t) => {
   nuxt.close()
 })

examples/with-sockets/io/index.js

@@ -6,7 +6,7 @@ const io = socketIO(server)
 
 export default function () {
   // overwrite nuxt.listen()
-  this.nuxt.listen = (port, host) => new Promise((resolve) => server.listen(port || 3000, host || 'localhost', resolve))
+  this.nuxt.listen = (port, host) => new Promise(resolve => server.listen(port || 3000, host || 'localhost', resolve))
   // close this server on 'close' event
   this.nuxt.hook('close', () => new Promise(server.close))
 

examples/with-tape/test/index.test.js

@@ -2,7 +2,7 @@ import test from 'tape'
 import { shallow } from 'vue-test-utils'
 import Index from '../pages/index.vue'
 
-test('renders Index.vue correctly', t => {
+test('renders Index.vue correctly', (t) => {
   t.plan(4)
 
   const wrapper = shallow(Index, {

lib/app/App.js

@@ -4,7 +4,7 @@ import Vue from 'vue'
 import '<%= relativeToBuild(resolvePath(c.src || c)) %>'
 <% }) %>
 
-<%= Object.keys(layouts).map(key => {
+<%= Object.keys(layouts).map((key) => {
   if (splitChunks.layouts) {
     return `const _${hash(key)} = () => import('${layouts[key]}'  /* webpackChunkName: "${wChunk('layouts/' + key)}" */).then(m => m.default || m)`
   } else {
@@ -87,8 +87,9 @@ export default {
       return this.layout
     },
     loadLayout (layout) {
-      if (!layout || !(layouts['_' + layout] || resolvedLayouts['_' + layout])) layout = 'default'
-      let _layout = '_' + layout
+      const undef = !layout
+      const inexisting = !(layouts[`_${layout}`] || resolvedLayouts[`_` + layout])
+      let _layout = `_${(undef || inexisting) ? 'default' : layout}`
       if (resolvedLayouts[_layout]) {
         return Promise.resolve(resolvedLayouts[_layout])
       }
@@ -106,13 +107,17 @@ export default {
     }
     <% } else { %>
     setLayout(layout) {
-      if (!layout || !layouts['_' + layout]) layout = 'default'
+      if (!layout || !layouts['_' + layout]) {
+        layout = 'default'
+      }
       this.layoutName = layout
       this.layout = layouts['_' + layout]
       return this.layout
     },
     loadLayout(layout) {
-      if (!layout || !layouts['_' + layout]) layout = 'default'
+      if (!layout || !layouts['_' + layout]) {
+        layout = 'default'
+      }
       return Promise.resolve(layouts['_' + layout])
     }
     <% } %>

lib/app/client.js

@@ -68,7 +68,7 @@ Vue.config.errorHandler = function (err, vm, info) {
 // Create and mount App
 createApp()
 .then(mountApp)
-.catch(err => {
+.catch((err) => {
   if (err.message === 'ERR_REDIRECT') {
     return // Wait for browser to redirect...
   }
@@ -87,12 +87,12 @@ function componentOption(component, key, ...args) {
 }
 
 function mapTransitions(Components, to, from) {
-  const componentTransitions = component => {
+  const componentTransitions = (component) => {
     const transition = componentOption(component, 'transition', to, from) || {}
     return (typeof transition === 'string' ? { name: transition } : transition)
   }
 
-  return Components.map(Component => {
+  return Components.map((Component) => {
     // Clone original object to prevent overrides
     const transitions = Object.assign({}, componentTransitions(Component))
 
@@ -100,8 +100,8 @@ function mapTransitions(Components, to, from) {
     if (from && from.matched.length && from.matched[0].components.default) {
       const from_transitions = componentTransitions(from.matched[0].components.default)
       Object.keys(from_transitions)
-        .filter(key => from_transitions[key] && key.toLowerCase().indexOf('leave') !== -1)
-        .forEach(key => { transitions[key] = from_transitions[key] })
+        .filter((key) => from_transitions[key] && key.toLowerCase().indexOf('leave') !== -1)
+        .forEach((key) => { transitions[key] = from_transitions[key] })
     }
 
     return transitions
@@ -142,7 +142,7 @@ async function loadAsyncComponents (to, from, next) {
     next()
   } catch (err) {
     err = err || {}
-    const statusCode = err.statusCode || err.status || (err.response && err.response.status) || 500
+    const statusCode = (err.statusCode || err.status || (err.response && err.response.status) || 500)
     this.error({ statusCode, message: err.message })
     this.$nuxt.$emit('routeChanged', to, from, err)
     next(false)
@@ -183,14 +183,14 @@ function callMiddleware (Components, context, layout) {
     if (layout.middleware) {
       midd = midd.concat(layout.middleware)
     }
-    Components.forEach(Component => {
+    Components.forEach((Component) => {
       if (Component.options.middleware) {
         midd = midd.concat(Component.options.middleware)
       }
     })
   }
 
-  midd = midd.map(name => {
+  midd = midd.map((name) => {
     if (typeof name === 'function') return name
     if (typeof middleware[name] !== 'function') {
       unknownMiddleware = true
@@ -209,14 +209,24 @@ async function render (to, from, next) {
   if (to === from) _lastPaths = []
   else {
     const fromMatches = []
-    _lastPaths = getMatchedComponents(from, fromMatches).map((Component, i) => compile(from.matched[fromMatches[i]].path)(from.params))
+    _lastPaths = getMatchedComponents(from, fromMatches).map((Component, i) => {
+      return compile(from.matched[fromMatches[i]].path)(from.params)
+    })
   }
 
   // nextCalled is true when redirected
   let nextCalled = false
-  const _next = path => {
-    <% if(loading) { %>if (from.path === path.path && this.$loading.finish) this.$loading.finish()<% } %>
-    <% if(loading) { %>if (from.path !== path.path && this.$loading.pause) this.$loading.pause()<% } %>
+  const _next = (path) => {
+    <% if (loading) { %>
+    if (from.path === path.path && this.$loading.finish) {
+      this.$loading.finish()
+    }
+    <% } %>
+    <% if (loading) { %>
+    if (from.path !== path.path && this.$loading.pause) {
+      this.$loading.pause()
+    }
+    <% } %>
     if (nextCalled) return
     nextCalled = true
     next(path)
@@ -241,7 +251,11 @@ async function render (to, from, next) {
     await callMiddleware.call(this, Components, app.context)
     if (nextCalled) return
     // Load layout for error page
-    const layout = await this.loadLayout(typeof NuxtError.layout === 'function' ? NuxtError.layout(app.context) : NuxtError.layout)
+    const layout = await this.loadLayout(
+      typeof NuxtError.layout === 'function'
+        ? NuxtError.layout(app.context)
+        : NuxtError.layout
+    )
     await callMiddleware.call(this, Components, app.context, layout)
     if (nextCalled) return
     // Show error page
@@ -250,7 +264,7 @@ async function render (to, from, next) {
   }
 
   // Update ._data and other properties if hot reloaded
-  Components.forEach(Component => {
+  Components.forEach((Component) => {
     if (Component._Ctor && Component._Ctor.options) {
       Component.options.asyncData = Component._Ctor.options.asyncData
       Component.options.fetch = Component._Ctor.options.fetch
@@ -280,7 +294,7 @@ async function render (to, from, next) {
 
     // Call .validate()
     let isValid = true
-    Components.forEach(Component => {
+    Components.forEach((Component) => {
       if (!isValid) return
       if (typeof Component.options.validate !== 'function') return
       isValid = Component.options.validate(app.context)
@@ -314,16 +328,25 @@ async function render (to, from, next) {
 
       let promises = []
 
-      const hasAsyncData = Component.options.asyncData && typeof Component.options.asyncData === 'function'
+      const hasAsyncData = (
+        Component.options.asyncData && 
+        typeof Component.options.asyncData === 'function'
+      )
       const hasFetch = !!Component.options.fetch
-      <% if (loading) { %>const loadingIncrease = (hasAsyncData && hasFetch) ? 30 : 45<% } %>
+      <% if (loading) { %>
+      const loadingIncrease = (hasAsyncData && hasFetch) ? 30 : 45
+      <% } %>
 
       // Call asyncData(context)
       if (hasAsyncData) {
         const promise = promisify(Component.options.asyncData, app.context)
-        .then(asyncDataResult => {
+        .then((asyncDataResult) => {
           applyAsyncData(Component, asyncDataResult)
-          <% if(loading) { %>if(this.$loading.increase) this.$loading.increase(loadingIncrease)<% } %>
+          <% if (loading) { %>
+          if(this.$loading.increase) {
+            this.$loading.increase(loadingIncrease)
+          }
+          <% } %>
         })
         promises.push(promise)
       }
@@ -337,8 +360,12 @@ async function render (to, from, next) {
         if (!p || (!(p instanceof Promise) && (typeof p.then !== 'function'))) {
             p = Promise.resolve(p)
         }
-        p.then(fetchResult => {
-          <% if(loading) { %>if(this.$loading.increase) this.$loading.increase(loadingIncrease)<% } %>
+        p.then((fetchResult) => {
+          <% if (loading) { %>
+          if (this.$loading.increase) {
+            this.$loading.increase(loadingIncrease)
+          }
+          <% } %>
         })
         promises.push(p)
       }
@@ -348,17 +375,21 @@ async function render (to, from, next) {
 
     // If not redirected
     if (!nextCalled) {
-      
       <% if (loading) { %>
-      if (this.$loading.finish && !this.$loading.manual) this.$loading.finish()
+      if (this.$loading.finish) {
+        this.$loading.finish()
+      }
       <% } %>
       next()
     }
 
   } catch (error) {
-    if (!error) error = {}
+    if (!error) {
+      error = {}
+    }
     _lastPaths = []
-    error.statusCode = error.statusCode || error.status || (error.response && error.response.status) || 500
+    const errorResponseStatus = (error.response && error.response.status)
+    error.statusCode = error.statusCode || error.status || errorResponseStatus || 500
 
     // Load error layout
     let layout = NuxtError.layout
@@ -393,7 +424,10 @@ function showNextPage(to) {
   }
 
   // Set layout
-  let layout = this.$options.nuxt.err ? NuxtError.layout : to.matched[0].components.default.options.layout
+  let layout = this.$options.nuxt.err
+    ? NuxtError.layout
+    : to.matched[0].components.default.options.layout
+
   if (typeof layout === 'function') {
     layout = layout(app.context)
   }
@@ -412,8 +446,16 @@ function fixPrepatch(to, ___) {
 
     instances.forEach((instance, i) => {
       if (!instance) return
-      // if (!this._queryChanged && to.matched[matches[i]].path.indexOf(':') === -1 && to.matched[matches[i]].path.indexOf('*') === -1) return // If not a dynamic route, skip
-      if (instance.constructor._dataRefresh && Components[i] === instance.constructor && typeof instance.constructor.options.data === 'function') {
+      // if (
+      //   !this._queryChanged &&
+      //   to.matched[matches[i]].path.indexOf(':') === -1 &&
+      //   to.matched[matches[i]].path.indexOf('*') === -1
+      // ) return // If not a dynamic route, skip
+      if (
+        instance.constructor._dataRefresh &&
+        Components[i] === instance.constructor &&
+        typeof instance.constructor.options.data === 'function'
+      ) {
         const newData = instance.constructor.options.data.call(instance)
         for (let key in newData) {
           Vue.set(instance.$data, key, newData[key])

lib/app/components/nuxt.js

@@ -1,6 +1,16 @@
 import Vue from 'vue'
 import NuxtChild from './nuxt-child'
-import NuxtError from '<%= components.ErrorPage ? ((components.ErrorPage.indexOf('~') === 0 || components.ErrorPage.indexOf('@') === 0) ? components.ErrorPage : "../" + components.ErrorPage) : "./nuxt-error.vue" %>'
+
+<% if (components.ErrorPage) { %>
+  <% if (('~@').includes(components.ErrorPage.charAt(0))) { %>
+import NuxtError from '<%= components.ErrorPage %>'
+  <% } else { %>
+import NuxtError from '<%= "../" + components.ErrorPage %>'
+  <% } %>
+<% } else { %>
+import NuxtError from './nuxt-error.vue'
+<% } %>
+
 import { compile } from '../utils'
 
 export default {

lib/app/index.js

@@ -12,7 +12,7 @@ import { setContext, getLocation, getRouteData } from './utils'
 <% if (store) { %>import { createStore } from './store.js'<% } %>
 
 /* Plugins */
-<% plugins.forEach(plugin => { %>import <%= plugin.name %> from '<%= plugin.name %>' // Source: <%= relativeToBuild(plugin.src) %><%= (plugin.ssr===false) ? ' (ssr: false)' : '' %>
+<% plugins.forEach((plugin) => { %>import <%= plugin.name %> from '<%= plugin.name %>' // Source: <%= relativeToBuild(plugin.src) %><%= (plugin.ssr===false) ? ' (ssr: false)' : '' %>
 <% }) %>
 
 // Component: <no-ssr>
@@ -156,10 +156,10 @@ async function createApp (ssrContext) {
   <% } %>
 
   // Plugin execution
-  <% plugins.filter(p => p.ssr).forEach(plugin => { %>
+  <% plugins.filter(p => p.ssr).forEach((plugin) => { %>
   if (typeof <%= plugin.name %> === 'function') await <%= plugin.name %>(app.context, inject)<% }) %>
   <% if (plugins.filter(p => !p.ssr).length) { %>
-  if (process.browser) { <% plugins.filter(p => !p.ssr).forEach(plugin => { %>
+  if (process.browser) { <% plugins.filter((p) => !p.ssr).forEach((plugin) => { %>
     if (typeof <%= plugin.name %> === 'function') await <%= plugin.name %>(app.context, inject)<% }) %>
   }<% } %>
 

lib/app/router.js

@@ -59,7 +59,7 @@ const scrollBehavior = function (to, from, savedPosition) {
     position = savedPosition
   }
 
-  return new Promise(resolve => {
+  return new Promise((resolve) => {
     // wait for the out transition to complete (if necessary)
     window.$nuxt.$once('triggerScroll', () => {
       // coords will be used if no selector is provided,

lib/app/server.js

@@ -12,7 +12,7 @@ const isDev = <%= isDev %>
 
 const noopApp = () => new Vue({ render: (h) => h('div') })
 
-const createNext = ssrContext => opts => {
+const createNext = (ssrContext) => (opts) => {
   ssrContext.redirected = opts
   // If nuxt generate
   if (!ssrContext.res) {
@@ -40,7 +40,7 @@ const createNext = ssrContext => opts => {
 // state of our application before actually rendering it.
 // Since data fetching is async, this function is expected to
 // return a Promise that resolves to the app instance.
-export default async ssrContext => {
+export default async (ssrContext) => {
   // Create ssrContext.next for simulate next() of beforeEach() when wanted to redirect
   ssrContext.redirected = false
   ssrContext.next = createNext(ssrContext)
@@ -170,13 +170,13 @@ export default async ssrContext => {
   if (!Components.length) return render404Page()
 
   // Call asyncData & fetch hooks on components matched by the route.
-  let asyncDatas = await Promise.all(Components.map(Component => {
+  let asyncDatas = await Promise.all(Components.map((Component) => {
     let promises = []
 
     // Call asyncData(context)
     if (Component.options.asyncData && typeof Component.options.asyncData === 'function') {
       let promise = promisify(Component.options.asyncData, app.context)
-      promise.then(asyncDataResult => {
+      promise.then((asyncDataResult) => {
         ssrContext.asyncData[Component.cid] = asyncDataResult
         applyAsyncData(Component)
         return asyncDataResult

lib/app/utils.js

@@ -505,7 +505,7 @@ function formatUrl (url, query) {
  * @return {string}
  */
 function formatQuery (query) {
-  return Object.keys(query).sort().map(key => {
+  return Object.keys(query).sort().map((key) => {
     var val = query[key]
     if (val == null) {
       return ''

lib/builder/builder.js

@@ -63,7 +63,7 @@ export default class Builder {
 
   get plugins() {
     return _.uniqBy(
-      this.options.plugins.map(p => {
+      this.options.plugins.map((p) => {
         if (typeof p === 'string') p = { src: p }
         const pluginBaseName = path.basename(p.src, path.extname(p.src)).replace(
           /[^a-zA-Z?\d\s:]/g,
@@ -214,7 +214,7 @@ export default class Builder {
         ignore: this.options.ignore
       })
       let hasErrorLayout = false
-      layoutsFiles.forEach(file => {
+      layoutsFiles.forEach((file) => {
         let name = file
           .split('/')
           .slice(1)
@@ -259,7 +259,7 @@ export default class Builder {
       ;(await glob(`${this.options.dir.pages}/**/*.{vue,js}`, {
         cwd: this.options.srcDir,
         ignore: this.options.ignore
-      })).forEach(f => {
+      })).forEach((f) => {
         const key = f.replace(/\.(js|vue)$/, '')
         if (/\.vue$/.test(f) || !files[key]) {
           files[key] = f.replace(/(['|"])/g, '\\$1')
@@ -310,7 +310,7 @@ export default class Builder {
     )
 
     templatesFiles = templatesFiles
-      .map(file => {
+      .map((file) => {
         // Skip if custom file was already provided in build.templates[]
         if (customTemplateFiles.indexOf(file) !== -1) {
           return
@@ -330,7 +330,7 @@ export default class Builder {
     // -- Custom templates --
     // Add custom template files
     templatesFiles = templatesFiles.concat(
-      this.options.build.templates.map(t => {
+      this.options.build.templates.map((t) => {
         return Object.assign(
           {
             src: r(this.options.srcDir, t.src || t),
@@ -439,7 +439,7 @@ export default class Builder {
     }
 
     // Alias plugins to their real path
-    this.plugins.forEach(p => {
+    this.plugins.forEach((p) => {
       const src = this.relativeToBuild(p.src)
 
       // Client config
@@ -455,7 +455,7 @@ export default class Builder {
     })
 
     // Configure compilers
-    this.compilers = compilersOptions.map(compilersOption => {
+    this.compilers = compilersOptions.map((compilersOption) => {
       const compiler = webpack(compilersOption)
 
       // In dev, write files in memory FS
@@ -476,7 +476,7 @@ export default class Builder {
     // Start Builds
     const runner = this.options.dev ? parallel : sequence
 
-    await runner(this.compilers, compiler => {
+    await runner(this.compilers, (compiler) => {
       return this.webpackCompile(compiler)
     })
   }
@@ -488,7 +488,7 @@ export default class Builder {
       await this.nuxt.callHook('build:compile', { name, compiler })
 
       // Load renderer resources after build
-      compiler.hooks.done.tap('load-resources', async stats => {
+      compiler.hooks.done.tap('load-resources', async (stats) => {
         await this.nuxt.callHook('build:compiled', {
           name,
           compiler,
@@ -510,7 +510,7 @@ export default class Builder {
         }
         // Server, build and watch for changes
         this.compilersWatching.push(
-          compiler.watch(this.options.watchers.webpack, err => {
+          compiler.watch(this.options.watchers.webpack, (err) => {
             /* istanbul ignore if */
             if (err) return reject(err)
           })

lib/builder/generator.js

@@ -183,7 +183,7 @@ export default class Generator {
       'vue-ssr-client-manifest.json'
     ].map(file => path.resolve(this.distNuxtPath, file))
 
-    extraFiles.forEach(file => {
+    extraFiles.forEach((file) => {
       if (fsExtra.existsSync(file)) {
         fsExtra.removeSync(file)
       }
@@ -195,14 +195,11 @@ export default class Generator {
   decorateWithPayloads(routes, generateRoutes) {
     let routeMap = {}
     // Fill routeMap for known routes
-    routes.forEach(route => {
-      routeMap[route] = {
-        route,
-        payload: null
-      }
+    routes.forEach((route) => {
+      routeMap[route] = { route, payload: null }
     })
     // Fill routeMap with given generate.routes
-    generateRoutes.forEach(route => {
+    generateRoutes.forEach((route) => {
       // route is either a string or like { route : '/my_route/1', payload: {} }
       const path = _.isString(route) ? route : route.route
       routeMap[path] = {

lib/builder/webpack/base.js

@@ -139,7 +139,7 @@ export default class WebpackBaseConfig {
       },
       {
         test: /\.jsx?$/,
-        exclude: file => {
+        exclude: (file) => {
           // not exclude files outside node_modules
           if (/node_modules/.test(file)) {
             for (let module of [/\.vue\.js/].concat(this.options.build.transpile)) {

lib/builder/webpack/plugins/stats.js

@@ -5,7 +5,7 @@ export default class StatsPlugin {
   }
 
   apply(compiler) {
-    compiler.hooks.done.tap('stats-plugin', stats => {
+    compiler.hooks.done.tap('stats-plugin', (stats) => {
       process.stdout.write(
         '\n' +
           stats.toString(this.statsOptions) +

lib/builder/webpack/plugins/vue/client.js

@@ -19,10 +19,10 @@ export default class VueSSRClientPlugin {
       const initialFiles = uniq(Object.keys(stats.entrypoints)
         .map(name => stats.entrypoints[name].assets)
         .reduce((assets, all) => all.concat(assets), [])
-        .filter((file) => isJS(file) || isCSS(file)))
+        .filter(file => isJS(file) || isCSS(file)))
 
       const asyncFiles = allFiles
-        .filter((file) => isJS(file) || isCSS(file))
+        .filter(file => isJS(file) || isCSS(file))
         .filter(file => initialFiles.indexOf(file) < 0)
 
       const manifest = {
@@ -35,7 +35,7 @@ export default class VueSSRClientPlugin {
 
       const assetModules = stats.modules.filter(m => m.assets.length)
       const fileToIndex = file => manifest.all.indexOf(file)
-      stats.modules.forEach(m => {
+      stats.modules.forEach((m) => {
         // ignore modules duplicated in multiple chunks
         if (m.chunks.length === 1) {
           const cid = m.chunks[0]
@@ -46,7 +46,7 @@ export default class VueSSRClientPlugin {
           const id = m.identifier.replace(/\s\w+$/, '') // remove appended hash
           const files = manifest.modules[hash(id)] = chunk.files.map(fileToIndex)
           // find all asset modules associated with the same chunk
-          assetModules.forEach(m => {
+          assetModules.forEach((m) => {
             if (m.chunks.some(id => id === cid)) {
               files.push.apply(files, m.assets.map(fileToIndex))
             }

lib/builder/webpack/plugins/vue/server.js

@@ -42,7 +42,7 @@ export default class VueSSRServerPlugin {
         maps: {}
       }
 
-      stats.assets.forEach(asset => {
+      stats.assets.forEach((asset) => {
         if (asset.name.match(/\.js$/)) {
           bundle.files[asset.name] = compilation.assets[asset.name].source()
         } else if (asset.name.match(/\.js\.map$/)) {

lib/builder/webpack/plugins/vue/util.js

@@ -4,7 +4,7 @@ const prefix = `[vue-server-renderer-webpack-plugin]`
 export const warn = msg => console.error(chalk.red(`${prefix} ${msg}\n`)) // eslint-disable-line no-console
 export const tip = msg => console.log(chalk.yellow(`${prefix} ${msg}\n`)) // eslint-disable-line no-console
 
-export const validate = compiler => {
+export const validate = (compiler) => {
   if (compiler.options.target !== 'node') {
     warn('webpack config `target` should be "node".')
   }

lib/builder/webpack/plugins/warnfix.js

@@ -1,7 +1,7 @@
 export default class WarnFixPlugin {
   apply(compiler) /* istanbul ignore next */ {
-    compiler.hooks.done.tap('warnfix-plugin', stats => {
-      stats.compilation.warnings = stats.compilation.warnings.filter(warn => {
+    compiler.hooks.done.tap('warnfix-plugin', (stats) => {
+      stats.compilation.warnings = stats.compilation.warnings.filter((warn) => {
         if (
           warn.name === 'ModuleDependencyWarning' &&
           warn.message.includes(`export 'default'`) &&

lib/builder/webpack/server.js

@@ -60,7 +60,7 @@ export default class WebpackServerConfig extends BaseConfig {
     // https://webpack.js.org/configuration/externals/#externals
     // https://github.com/liady/webpack-node-externals
     // https://vue-loader.vuejs.org/migrating.html#ssr-externals
-    this.options.modulesDir.forEach(dir => {
+    this.options.modulesDir.forEach((dir) => {
       if (fs.existsSync(dir)) {
         config.externals.push(
           nodeExternals({

lib/builder/webpack/utils/postcss.js

@@ -86,7 +86,7 @@ export default class PostcssConfig {
     if (isPureObject(plugins)) {
       // Map postcss plugins into instances on object mode once
       config.plugins = Object.keys(plugins)
-        .map(p => {
+        .map((p) => {
           const plugin = require(p)
           const opts = plugins[p]
           if (opts === false) return // Disabled

lib/common/utils.js

@@ -178,7 +178,7 @@ export const relativeTo = function relativeTo() {
 }
 
 export const flatRoutes = function flatRoutes(router, _path = '', routes = []) {
-  router.forEach(r => {
+  router.forEach((r) => {
     if (!r.path.includes(':') && !r.path.includes('*')) {
       /* istanbul ignore if */
       if (r.children) {
@@ -202,7 +202,7 @@ export const flatRoutes = function flatRoutes(router, _path = '', routes = []) {
 function cleanChildrenRoutes(routes, isChild = false) {
   let start = -1
   let routesIndex = []
-  routes.forEach(route => {
+  routes.forEach((route) => {
     if (/-index$/.test(route.name) || route.name === 'index') {
       // Save indexOf 'index' key in name
       let res = route.name.split('-')
@@ -211,7 +211,7 @@ function cleanChildrenRoutes(routes, isChild = false) {
       routesIndex.push(res)
     }
   })
-  routes.forEach(route => {
+  routes.forEach((route) => {
     route.path = isChild ? route.path.replace('/', '') : route.path
     if (route.path.indexOf('?') > -1) {
       let names = route.name.split('-')
@@ -219,7 +219,7 @@ function cleanChildrenRoutes(routes, isChild = false) {
       if (!isChild) {
         paths.shift()
       } // clean first / for parents
-      routesIndex.forEach(r => {
+      routesIndex.forEach((r) => {
         let i = r.indexOf('index') - start //  children names
         if (i < paths.length) {
           for (let a = 0; a <= i; a++) {
@@ -247,7 +247,7 @@ function cleanChildrenRoutes(routes, isChild = false) {
 
 export const createRoutes = function createRoutes(files, srcDir, pagesDir) {
   let routes = []
-  files.forEach(file => {
+  files.forEach((file) => {
     let keys = file
       .replace(RegExp(`^${pagesDir}`), '')
       .replace(/\.(vue|js)$/, '')

lib/core/middleware/error.js

@@ -59,13 +59,11 @@ export default function errorMiddleware(err, req, res, next) {
     true
   )
   if (isJson) {
-    youch.toJSON().then(json => {
+    youch.toJSON().then((json) => {
       sendResponse(JSON.stringify(json, undefined, 2), 'text/json')
     })
   } else {
-    youch.toHTML().then(html => {
-      sendResponse(html)
-    })
+    youch.toHTML().then(html => sendResponse(html))
   }
 }
 

lib/core/module.js

@@ -137,7 +137,7 @@ export default class ModuleContainer {
       options = {}
     }
 
-    return new Promise(resolve => {
+    return new Promise((resolve) => {
       // Call module with `this` context and pass options
       const result = handler.call(this, options)
 

lib/core/nuxt.js

@@ -40,7 +40,7 @@ export default class Nuxt {
     // ESM Loader
     this.esm = esm(module, {})
 
-    this._ready = this.ready().catch(err => {
+    this._ready = this.ready().catch((err) => {
       consola.fatal(err)
     })
   }
@@ -97,13 +97,10 @@ export default class Nuxt {
   }
 
   addObjectHooks(hooksObj) {
-    Object.keys(hooksObj).forEach(name => {
+    Object.keys(hooksObj).forEach((name) => {
       let hooks = hooksObj[name]
       hooks = Array.isArray(hooks) ? hooks : [hooks]
-
-      hooks.forEach(hook => {
-        this.hook(name, hook)
-      })
+      hooks.forEach(hook => this.hook(name, hook))
     })
   }
 
@@ -111,7 +108,6 @@ export default class Nuxt {
     if (!this.readyMessage) {
       return
     }
-
     consola.ready({
       message: this.readyMessage,
       badge: true,
@@ -123,7 +119,7 @@ export default class Nuxt {
     return this.ready().then(() => new Promise((resolve, reject) => {
       const server = this.renderer.app.listen(
         { port, host, exclusive: false },
-        err => {
+        (err) => {
           /* istanbul ignore if */
           if (err) {
             return reject(err)
@@ -143,7 +139,7 @@ export default class Nuxt {
             () =>
               new Promise((resolve, reject) => {
                 // Destroy server by forcing every connection to be closed
-                server.destroy(err => {
+                server.destroy((err) => {
                   consola.debug('server closed')
                   /* istanbul ignore if */
                   if (err) {

lib/core/renderer.js

@@ -258,7 +258,7 @@ export default class Renderer {
     }
 
     // Add User provided middleware
-    this.options.serverMiddleware.forEach(m => {
+    this.options.serverMiddleware.forEach((m) => {
       this.useMiddleware(m)
     })
 
@@ -420,7 +420,7 @@ export default class Renderer {
         window.scrollTo = () => {}
       }
     }
-    const jsdomErrHandler = err => { throw err }
+    const jsdomErrHandler = (err) => { throw err }
     if (opts.virtualConsole !== false) {
       options.virtualConsole = new jsdom.VirtualConsole().sendTo(consola)
       // throw error when window creation failed
@@ -439,7 +439,7 @@ export default class Renderer {
       throw error
     }
     // Used by nuxt.js to say when the components are loaded and the app ready
-    await timeout(new Promise(resolve => {
+    await timeout(new Promise((resolve) => {
       window._onNuxtLoaded = () => resolve(window)
     }), 20000, 'Components loading in renderAndGetWindow was not completed in 20s')
     if (opts.virtualConsole !== false) {

test/e2e/basic.browser.test.js

@@ -28,17 +28,15 @@ describe('basic browser', () => {
   })
 
   test('/noloading', async () => {
-    const { hook } = await page.nuxt.navigate('/noloading', true)
+    const { hook } = await page.nuxt.navigate('/noloading')
     let loading = await page.nuxt.loadingData()
-
     expect(loading.show).toBe(true)
     await hook
     expect(loading.show).toBe(true)
-    await new Promise((resolve) => {
-      setTimeout(() => resolve(), 1800)
-    })
+    await page.waitForFunction(`document.querySelector('p').innerText === 'true'`)
+    expect(await page.$text('p')).toBe('true')
     loading = await page.nuxt.loadingData()
-    expect(loading.percent).toBe(100)
+    expect(loading.show).toBe(true)
   })
 
   test('/stateless', async () => {
@@ -54,7 +52,7 @@ describe('basic browser', () => {
     await page.nuxt.navigate('/css')
 
     expect(await page.$text('.red')).toBe('This is red')
-    expect(await page.$eval('.red', red => {
+    expect(await page.$eval('.red', (red) => {
       const { color, backgroundColor } = window.getComputedStyle(red)
       return { color, backgroundColor }
     })).toEqual({

test/fixtures/basic/nuxt.config.js

@@ -4,6 +4,7 @@ export default {
   generate: {
     routes: [
       // TODO: generate with {build: false} does not scans pages!
+      '/noloading',
       '/stateless',
       '/css',
       '/stateful',

test/fixtures/basic/pages/await-async-data.vue

@@ -4,7 +4,7 @@
 
 <script>
 const fetchData = () => {
-  return new Promise(resolve => {
+  return new Promise((resolve) => {
     setTimeout(() => resolve({ name: 'Await Nuxt.js' }), 10)
   })
 }

test/fixtures/basic/pages/noloading.vue

@@ -1,5 +1,8 @@
 <template>
-  <p>{{ name }}</p>
+  <div>
+    <h1>{{ name }}</h1>
+    <p>{{ loaded }}</p>
+  </div>
 </template>
 
 <script>
@@ -7,16 +10,22 @@ export default {
   loading: false,
   asyncData() {
     return new Promise((resolve) => {
-      setTimeout(() => resolve({ name: 'Nuxt.js' }), 10)
+      setTimeout(() => resolve({
+        loaded: false,
+        name: 'Nuxt.js'
+      }), 10)
     })
   },
-  watch: {
-    $route(to) {
-      this.$nuxt.$loading.start()
-    }
-  },
   mounted() {
-    setTimeout(() => this.$nuxt.$loading.finish(), 1500)
+    setTimeout(() => {
+      this.$nuxt.$loading.finish()
+      setTimeout(() => {
+        // Re-enable loader as we move on
+        // to normal pages in the test
+        this.$nuxt.$loading.start()
+        this.loaded = true
+      }, 1500)
+    }, 1500)
   }
 }
 </script>

test/fixtures/children/pages/patch/_id/child/_slug.vue

@@ -18,7 +18,7 @@ async function search(q) {
   q = String(q || '').toLowerCase()
 
   return new Promise((resolve) => {
-    const searchResults = countries.filter((s) => s.toLowerCase().includes(q))
+    const searchResults = countries.filter(s => s.toLowerCase().includes(q))
     setTimeout(() => resolve(searchResults), 100)
   })
 }

test/fixtures/module/modules/hooks/index.js

@@ -2,26 +2,26 @@ export default function () {
   let ctr = 1
 
   // Add hook for module
-  this.nuxt.hook('modules:done', moduleContainer => {
+  this.nuxt.hook('modules:done', (moduleContainer) => {
     this.nuxt.__module_hook = moduleContainer && ctr++
   })
 
   // Add hook for renderer
-  this.nuxt.hook('render:done', renderer => {
+  this.nuxt.hook('render:done', (renderer) => {
     this.nuxt.__renderer_hook = renderer && ctr++
   })
 
   // Get data before data sent to client
-  this.nuxt.hook('render:context', data => {
+  this.nuxt.hook('render:context', (data) => {
     this.nuxt.__render_context = data
   })
 
   // Add hook for build
-  this.nuxt.hook('build:done', builder => {
+  this.nuxt.hook('build:done', (builder) => {
     this.nuxt.__builder_hook = builder && ctr++
   })
 
-  this.nuxt.hook('build:done', builder => {
+  this.nuxt.hook('build:done', (builder) => {
     this.nuxt.__builder_plugin = builder && ctr++
   })
 }

test/fixtures/module/nuxt.config.js

@@ -13,14 +13,14 @@ export default {
   ],
   serverMiddleware: ['./modules/middleware/midd2'],
   hooks(hook) {
-    hook('ready', nuxt => {
+    hook('ready', (nuxt) => {
       nuxt.__ready_called__ = true
     })
-    hook('build:done', builder => {
+    hook('build:done', (builder) => {
       builder.__build_done__ = true
     })
     // Add hook for renderer
-    hook('render:before', renderer => {
+    hook('render:before', (renderer) => {
       renderer.useMiddleware({
         path: '/use-middleware',
         handler: '~/modules/middleware/use-middleware'

test/fixtures/ssr/pages/asyncComponent.vue

@@ -5,7 +5,7 @@
 </template>
 
 <script>
-const AsyncTest = () => import('@/components/test.vue').then((m) => m.default || m)
+const AsyncTest = () => import('@/components/test.vue').then(m => m.default || m)
 
 export default {
   components: {

test/unit/basic.dev.test.js

@@ -21,7 +21,7 @@ describe('basic dev', () => {
         extend({ module: { rules } }, { isClient }) {
           if (isClient) {
             const babelLoader = rules.find(loader => loader.test.test('.jsx'))
-            transpile = (file) => !babelLoader.exclude(file)
+            transpile = file => !babelLoader.exclude(file)
           }
         }
       }

test/unit/basic.fail.generate.test.js

@@ -13,7 +13,7 @@ describe('basic fail generate', () => {
     const nuxt = new Nuxt(options)
     const generator = new Generator(nuxt)
 
-    await generator.generate({ build: false }).catch(e => {
+    await generator.generate({ build: false }).catch((e) => {
       expect(e.message).toBe('Not today!')
     })
   })

test/unit/cli-start.test.js

@@ -20,15 +20,15 @@ describe.skip.appveyor('cli', () => {
 
     const nuxtStart = spawn('node', [nuxtBin, 'start', rootDir], { env })
 
-    nuxtStart.stdout.on('data', data => {
+    nuxtStart.stdout.on('data', (data) => {
       stdout += data
     })
 
-    nuxtStart.on('error', err => {
+    nuxtStart.on('error', (err) => {
       error = err
     })
 
-    nuxtStart.on('close', code => {
+    nuxtStart.on('close', (code) => {
       exitCode = code
     })
 

test/unit/cli.test.js

@@ -20,15 +20,15 @@ describe.skip.appveyor('cli', () => {
 
     const nuxtStart = spawn('node', [nuxtBin, 'start', rootDir], { env })
 
-    nuxtStart.stdout.on('data', data => {
+    nuxtStart.stdout.on('data', (data) => {
       stdout += data
     })
 
-    nuxtStart.on('error', err => {
+    nuxtStart.on('error', (err) => {
       error = err
     })
 
-    nuxtStart.on('close', code => {
+    nuxtStart.on('close', (code) => {
       exitCode = code
     })
 

test/unit/dynamic-routes.test.js

@@ -9,7 +9,7 @@ describe('dynamic routes', () => {
     return readFile(
       resolve(__dirname, '..', 'fixtures/dynamic-routes/.nuxt/router.js'),
       'utf-8'
-    ).then(routerFile => {
+    ).then((routerFile) => {
       routerFile = routerFile
         .slice(routerFile.indexOf('routes: ['))
         .replace('routes: [', '[')

test/unit/nuxt.test.js

@@ -25,7 +25,7 @@ describe('nuxt', () => {
       rootDir: resolve(__dirname, '..', 'fixtures', 'empty', 'pages')
     })
 
-    return new Builder(nuxt).build().catch(err => {
+    return new Builder(nuxt).build().catch((err) => {
       let s = String(err)
       expect(s.includes('No `pages` directory found')).toBe(true)
       expect(s.includes('Did you mean to run `nuxt` in the parent (`../`) directory?')).toBe(true)

test/unit/spa.test.js

@@ -7,7 +7,7 @@ let nuxt = null
 let port
 const url = route => 'http://localhost:' + port + route
 
-const renderRoute = async _url => {
+const renderRoute = async (_url) => {
   const window = await nuxt.renderAndGetWindow(url(_url))
   const head = window.document.head.innerHTML
   const html = window.document.body.innerHTML

test/unit/utils.test.js

@@ -61,7 +61,7 @@ describe('utils', () => {
     const array = [1]
     const promise = Utils.promisifyRoute(array)
     expect(typeof promise).toBe('object')
-    return promise.then(res => {
+    return promise.then((res) => {
       expect(res).toBe(array)
     })
   })
@@ -73,7 +73,7 @@ describe('utils', () => {
     }
     const promise = Utils.promisifyRoute(fn)
     expect(typeof promise).toBe('object')
-    return promise.then(res => {
+    return promise.then((res) => {
       expect(res).toBe(array)
     })
   })
@@ -81,27 +81,27 @@ describe('utils', () => {
   test('promisifyRoute (fn => promise)', () => {
     const array = [1, 2, 3]
     const fn = function () {
-      return new Promise(resolve => {
+      return new Promise((resolve) => {
         resolve(array)
       })
     }
     const promise = Utils.promisifyRoute(fn)
     expect(typeof promise).toBe('object')
-    return promise.then(res => {
+    return promise.then((res) => {
       expect(res).toBe(array)
     })
   })
 
   test('promisifyRoute ((fn(args) => promise))', () => {
     const fn = function (array) {
-      return new Promise(resolve => {
+      return new Promise((resolve) => {
         resolve(array)
       })
     }
     const array = [1, 2, 3]
     const promise = Utils.promisifyRoute(fn, array)
     expect(typeof promise).toBe('object')
-    return promise.then(res => {
+    return promise.then((res) => {
       expect(res).toBe(array)
     })
   })
@@ -112,7 +112,7 @@ describe('utils', () => {
     }
     const promise = Utils.promisifyRoute(fn)
     expect(typeof promise).toBe('object')
-    return promise.catch(e => {
+    return promise.catch((e) => {
       expect(e.message).toBe('Error here')
     })
   })
@@ -124,7 +124,7 @@ describe('utils', () => {
     const array = [1, 2, 3, 4]
     const promise = Utils.promisifyRoute(fn, array)
     expect(typeof promise).toBe('object')
-    return promise.catch(e => {
+    return promise.catch((e) => {
       expect(e.message).toBe('Error here: ' + array.join())
     })
   })
@@ -136,7 +136,7 @@ describe('utils', () => {
     }
     const promise = Utils.promisifyRoute(fn)
     expect(typeof promise).toBe('object')
-    return promise.then(res => {
+    return promise.then((res) => {
       expect(res).toBe(array)
     })
   })
@@ -149,7 +149,7 @@ describe('utils', () => {
     const object = { a: 1 }
     const promise = Utils.promisifyRoute(fn, array, object)
     expect(typeof promise).toBe('object')
-    return promise.then(res => {
+    return promise.then((res) => {
       expect(res.array).toBe(array)
       expect(res.object).toBe(object)
     })

test/utils/browser.js

@@ -55,7 +55,7 @@ export default class Browser {
         return { hook }
       },
       routeData() {
-        return page.evaluate($nuxt => {
+        return page.evaluate(($nuxt) => {
           return {
             path: $nuxt.$route.path,
             query: $nuxt.$route.query