diff --git a/.eslintignore b/.eslintignore
index 1521c8b76..884a2323e 100644
--- a/.eslintignore
+++ b/.eslintignore
@@ -1 +1 @@
-dist
+**/dist/**
diff --git a/.gitignore b/.gitignore
index 63161737b..8161b78c2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,6 @@
 .DS_Store
 node_modules/
+.eslintcache
 
 # Editor files
 /.idea
diff --git a/.prettierrc.json b/.prettierrc.json
index b2095be81..f79acadcb 100644
--- a/.prettierrc.json
+++ b/.prettierrc.json
@@ -1,4 +1,6 @@
 {
   "semi": false,
-  "singleQuote": true
+  "singleQuote": true,
+  "trailingComma": "none",
+  "arrowParens": "avoid"
 }
diff --git a/docs/api/options.md b/docs/api/options.md
index 3fa3b0548..68efd2eeb 100644
--- a/docs/api/options.md
+++ b/docs/api/options.md
@@ -169,7 +169,7 @@ You can also pass a function that takes the props as an argument:
 ```js
 shallowMount(Component, {
   scopedSlots: {
-    foo: function(props) {
+    foo: function (props) {
       return this.$createElement('div', props.index)
     }
   }
diff --git a/docs/fr/api/options.md b/docs/fr/api/options.md
index ed2171e5f..c4a13604d 100644
--- a/docs/fr/api/options.md
+++ b/docs/fr/api/options.md
@@ -168,7 +168,7 @@ Vous pouvez également passer une fonction qui prend les props comme argument :
 ```js
 shallowMount(Component, {
   scopedSlots: {
-    foo: function(props) {
+    foo: function (props) {
       return this.$createElement('div', props.index)
     }
   }
diff --git a/docs/fr/guides/common-tips.md b/docs/fr/guides/common-tips.md
index f9dad1e0f..da6e8d863 100644
--- a/docs/fr/guides/common-tips.md
+++ b/docs/fr/guides/common-tips.md
@@ -221,7 +221,7 @@ En pratique, bien que nous appelions et attendions `setData` pour assurer la mis
 
 ```js
 const transitionStub = () => ({
-  render: function(h) {
+  render: function (h) {
     return this.$options._renderChildren
   }
 })
diff --git a/docs/fr/guides/dom-events.md b/docs/fr/guides/dom-events.md
index b90f33ea2..0d8bce39e 100644
--- a/docs/fr/guides/dom-events.md
+++ b/docs/fr/guides/dom-events.md
@@ -144,7 +144,7 @@ Ce composant permet d'incrémenter/décrémenter la quantité à l'aide de diff
     },
 
     watch: {
-      quantity: function(newValue) {
+      quantity: function (newValue) {
         this.$emit('input', newValue)
       }
     }
diff --git a/docs/fr/installation/using-other-test-runners.md b/docs/fr/installation/using-other-test-runners.md
index d019ec8a9..2ad784d22 100644
--- a/docs/fr/installation/using-other-test-runners.md
+++ b/docs/fr/installation/using-other-test-runners.md
@@ -12,7 +12,7 @@ Vous trouverez ci-dessous une configuration de base de Karma pour Vue Test Utils
 // karma.conf.js
 var webpackConfig = require('./webpack.config.js')
 
-module.exports = function(config) {
+module.exports = function (config) {
   config.set({
     frameworks: ['mocha'],
     files: ['test/**/*.spec.js'],
diff --git a/docs/guides/common-tips.md b/docs/guides/common-tips.md
index e394786a3..240119ebf 100644
--- a/docs/guides/common-tips.md
+++ b/docs/guides/common-tips.md
@@ -223,7 +223,7 @@ In practice, although we are calling and awaiting `setData` to ensure the DOM is
 
 ```js
 const transitionStub = () => ({
-  render: function(h) {
+  render: function (h) {
     return this.$options._renderChildren
   }
 })
diff --git a/docs/guides/dom-events.md b/docs/guides/dom-events.md
index df0988d45..d203a740c 100644
--- a/docs/guides/dom-events.md
+++ b/docs/guides/dom-events.md
@@ -142,7 +142,7 @@ This component allows to increment/decrement the quantity using various keys.
     },
 
     watch: {
-      quantity: function(newValue) {
+      quantity: function (newValue) {
         this.$emit('input', newValue)
       }
     }
diff --git a/docs/installation/using-other-test-runners.md b/docs/installation/using-other-test-runners.md
index 0b49972e0..48349f267 100644
--- a/docs/installation/using-other-test-runners.md
+++ b/docs/installation/using-other-test-runners.md
@@ -12,7 +12,7 @@ Following is a basic Karma config for Vue Test Utils:
 // karma.conf.js
 var webpackConfig = require('./webpack.config.js')
 
-module.exports = function(config) {
+module.exports = function (config) {
   config.set({
     frameworks: ['mocha'],
     files: ['test/**/*.spec.js'],
diff --git a/docs/ja/api/options.md b/docs/ja/api/options.md
index 7f6a550bd..8d4e8e7cc 100644
--- a/docs/ja/api/options.md
+++ b/docs/ja/api/options.md
@@ -94,7 +94,7 @@ props を引数に取る関数を渡すことができます。
 ```js
 shallowMount(Component, {
   scopedSlots: {
-    foo: function(props) {
+    foo: function (props) {
       return this.$createElement('div', props.index)
     }
   }
diff --git a/docs/ja/guides/dom-events.md b/docs/ja/guides/dom-events.md
index 3a3f35aaa..562117299 100644
--- a/docs/ja/guides/dom-events.md
+++ b/docs/ja/guides/dom-events.md
@@ -134,7 +134,7 @@ it('Click on yes button calls our method with argument "yes"', async () => {
       }
     },
     watch: {
-      quantity: function(newValue) {
+      quantity: function (newValue) {
         this.$emit('input', newValue)
       }
     }
diff --git a/docs/ja/guides/getting-started.md b/docs/ja/guides/getting-started.md
index d085eb9c7..cdcf63728 100644
--- a/docs/ja/guides/getting-started.md
+++ b/docs/ja/guides/getting-started.md
@@ -131,7 +131,7 @@ it('will catch the error using done', done => {
 })
 
 it('will catch the error using a promise', () => {
-  return Vue.nextTick().then(function() {
+  return Vue.nextTick().then(function () {
     expect(true).toBe(false)
   })
 })
diff --git a/docs/ja/installation/testing-single-file-components-with-karma.md b/docs/ja/installation/testing-single-file-components-with-karma.md
index 26ef15c6b..9e2c91f2a 100644
--- a/docs/ja/installation/testing-single-file-components-with-karma.md
+++ b/docs/ja/installation/testing-single-file-components-with-karma.md
@@ -36,7 +36,7 @@ npm install --save-dev @vue/test-utils karma karma-chrome-launcher karma-mocha k
 
 var webpackConfig = require('./webpack.config.js')
 
-module.exports = function(config) {
+module.exports = function (config) {
   config.set({
     frameworks: ['mocha'],
 
@@ -160,7 +160,7 @@ npm install --save-dev babel-plugin-istanbul
 ```js
 // karma.conf.js
 
-module.exports = function(config) {
+module.exports = function (config) {
   config.set({
     // ...
 
diff --git a/docs/ru/api/options.md b/docs/ru/api/options.md
index 40968a0bc..afeb619f3 100644
--- a/docs/ru/api/options.md
+++ b/docs/ru/api/options.md
@@ -107,7 +107,7 @@ shallowMount(Component, {
 ```js
 shallowMount(Component, {
   scopedSlots: {
-    foo: function(props) {
+    foo: function (props) {
       return this.$createElement('div', props.index)
     }
   }
diff --git a/docs/ru/guides/dom-events.md b/docs/ru/guides/dom-events.md
index b3ce272cb..5f472fc95 100644
--- a/docs/ru/guides/dom-events.md
+++ b/docs/ru/guides/dom-events.md
@@ -136,7 +136,7 @@ describe('Click event', () => {
     },
 
     watch: {
-      quantity: function(newValue) {
+      quantity: function (newValue) {
         this.$emit('input', newValue)
       }
     }
diff --git a/docs/ru/guides/getting-started.md b/docs/ru/guides/getting-started.md
index 77b324fa2..a4cc198d7 100644
--- a/docs/ru/guides/getting-started.md
+++ b/docs/ru/guides/getting-started.md
@@ -131,7 +131,7 @@ it('должен отлавливать ошибку с использовани
 })
 
 it('должен отлавливать ошибку с использованием promise', () => {
-  return Vue.nextTick().then(function() {
+  return Vue.nextTick().then(function () {
     expect(true).toBe(false)
   })
 })
diff --git a/docs/ru/installation/testing-single-file-components-with-karma.md b/docs/ru/installation/testing-single-file-components-with-karma.md
index 0105006e2..fe2cacf8a 100644
--- a/docs/ru/installation/testing-single-file-components-with-karma.md
+++ b/docs/ru/installation/testing-single-file-components-with-karma.md
@@ -36,7 +36,7 @@ npm install --save-dev @vue/test-utils karma karma-chrome-launcher karma-mocha k
 
 var webpackConfig = require('./webpack.config.js')
 
-module.exports = function(config) {
+module.exports = function (config) {
   config.set({
     frameworks: ['mocha'],
 
@@ -160,7 +160,7 @@ npm install --save-dev babel-plugin-istanbul
 ```js
 // karma.conf.js
 
-module.exports = function(config) {
+module.exports = function (config) {
   config.set({
     // ...
 
diff --git a/docs/zh/api/options.md b/docs/zh/api/options.md
index 076090228..40b86c2ad 100644
--- a/docs/zh/api/options.md
+++ b/docs/zh/api/options.md
@@ -167,7 +167,7 @@ shallowMount(Component, {
 ```js
 shallowMount(Component, {
   scopedSlots: {
-    foo: function(props) {
+    foo: function (props) {
       return this.$createElement('div', props.index)
     }
   }
diff --git a/docs/zh/guides/common-tips.md b/docs/zh/guides/common-tips.md
index 110fc0a96..780c980c9 100644
--- a/docs/zh/guides/common-tips.md
+++ b/docs/zh/guides/common-tips.md
@@ -222,7 +222,7 @@ test('should render Foo, then hide it', async () => {
 
 ```js
 const transitionStub = () => ({
-  render: function(h) {
+  render: function (h) {
     return this.$options._renderChildren
   }
 })
diff --git a/docs/zh/guides/dom-events.md b/docs/zh/guides/dom-events.md
index a3c858807..1af79fc2a 100644
--- a/docs/zh/guides/dom-events.md
+++ b/docs/zh/guides/dom-events.md
@@ -142,7 +142,7 @@ it('Click on yes button calls our method with argument "yes"', async () => {
     },
 
     watch: {
-      quantity: function(newValue) {
+      quantity: function (newValue) {
         this.$emit('input', newValue)
       }
     }
diff --git a/docs/zh/guides/getting-started.md b/docs/zh/guides/getting-started.md
index 70f35f93b..7b10a0336 100644
--- a/docs/zh/guides/getting-started.md
+++ b/docs/zh/guides/getting-started.md
@@ -164,7 +164,7 @@ it('will catch the error using done', done => {
 })
 
 it('will catch the error using a promise', () => {
-  return Vue.nextTick().then(function() {
+  return Vue.nextTick().then(function () {
     expect(true).toBe(false)
   })
 })
diff --git a/docs/zh/installation/testing-single-file-components-with-karma.md b/docs/zh/installation/testing-single-file-components-with-karma.md
index 544ae4521..a1a5dc19c 100644
--- a/docs/zh/installation/testing-single-file-components-with-karma.md
+++ b/docs/zh/installation/testing-single-file-components-with-karma.md
@@ -36,7 +36,7 @@ npm install --save-dev @vue/test-utils karma karma-chrome-launcher karma-mocha k
 
 var webpackConfig = require('./webpack.config.js')
 
-module.exports = function(config) {
+module.exports = function (config) {
   config.set({
     frameworks: ['mocha'],
 
@@ -160,7 +160,7 @@ npm install --save-dev babel-plugin-istanbul
 ```js
 // karma.conf.js
 
-module.exports = function(config) {
+module.exports = function (config) {
   config.set({
     // ...
 
diff --git a/package.json b/package.json
index 4ada8c2e2..d75249253 100644
--- a/package.json
+++ b/package.json
@@ -17,10 +17,10 @@
     "docs": "vuepress dev docs",
     "docs:build": "vuepress build docs",
     "flow": "flow check",
-    "lint": "eslint --ext js,vue .",
+    "lint": "eslint --ext js,vue . --cache",
     "lint:docs": "eslint --ext js,vue,md docs --ignore-path .gitignore",
     "lint:fix": "yarn lint -- --fix",
-    "format": "prettier --write \"**/*.{js,json,vue,md}\"",
+    "format": "prettier --write \"**/*.{js,json,vue,md}\" --cache",
     "format:check": "prettier --check \"**/*.{js,json,vue,md}\"",
     "release": "yarn build && yarn test:unit && lerna publish --conventional-commits -m \"chore(release): publish %s\"",
     "test": "yarn format:check && yarn lint && yarn lint:docs && yarn flow && yarn test:types && yarn test:unit -w 1 && yarn test:unit:browser",
@@ -91,7 +91,7 @@
     "karma-spec-reporter": "^0.0.32",
     "karma-webpack": "^4.0.2",
     "lint-staged": "^9.5.0",
-    "prettier": "^1.16.0",
+    "prettier": "^2.8.1",
     "puppeteer": "^5.2.1",
     "rollup-plugin-delete": "^2.0.0",
     "@rollup/plugin-replace": "^2.3.3",
diff --git a/packages/create-instance/create-instance.js b/packages/create-instance/create-instance.js
index 3c0ba7d2e..7aaafb962 100644
--- a/packages/create-instance/create-instance.js
+++ b/packages/create-instance/create-instance.js
@@ -107,7 +107,7 @@ export default function createInstance(
   const parentComponentOptions = options.parentComponent || {}
 
   const originalParentComponentProvide = parentComponentOptions.provide
-  parentComponentOptions.provide = function() {
+  parentComponentOptions.provide = function () {
     return {
       ...getValuesFromCallableOption.call(this, originalParentComponentProvide),
       // $FlowIgnore
@@ -116,7 +116,7 @@ export default function createInstance(
   }
 
   const originalParentComponentData = parentComponentOptions.data
-  parentComponentOptions.data = function() {
+  parentComponentOptions.data = function () {
     return {
       ...getValuesFromCallableOption.call(this, originalParentComponentData),
       vueTestUtils_childProps: { ...options.propsData }
@@ -126,7 +126,7 @@ export default function createInstance(
   parentComponentOptions.$_doNotStubChildren = true
   parentComponentOptions.$_isWrapperParent = true
   parentComponentOptions._isFunctionalContainer = componentOptions.functional
-  parentComponentOptions.render = function(h) {
+  parentComponentOptions.render = function (h) {
     return h(
       Constructor,
       createContext(options, scopedSlots, this.vueTestUtils_childProps),
diff --git a/packages/create-instance/create-scoped-slots.js b/packages/create-instance/create-scoped-slots.js
index 50464d9ee..daa4f3cb1 100644
--- a/packages/create-instance/create-scoped-slots.js
+++ b/packages/create-instance/create-scoped-slots.js
@@ -8,9 +8,9 @@ function isDestructuringSlotScope(slotScope: string): boolean {
   return /^{.*}$/.test(slotScope)
 }
 
-function getVueTemplateCompilerHelpers(
-  _Vue: Component
-): { [name: string]: Function } {
+function getVueTemplateCompilerHelpers(_Vue: Component): {
+  [name: string]: Function
+} {
   // $FlowIgnore
   const vue = new _Vue()
   const helpers = {}
@@ -111,7 +111,7 @@ export default function createScopedSlots(
 
     const slotScope = scopedSlotMatches.match && scopedSlotMatches.match[1]
 
-    scopedSlots[scopedSlotName] = function(props) {
+    scopedSlots[scopedSlotName] = function (props) {
       let res
       if (isFn) {
         res = renderFn.call({ ...helpers }, props)
diff --git a/packages/create-instance/log-events.js b/packages/create-instance/log-events.js
index 9de6abf20..c3fd97f0d 100644
--- a/packages/create-instance/log-events.js
+++ b/packages/create-instance/log-events.js
@@ -15,7 +15,7 @@ export function logEvents(
 
 export function addEventLogger(_Vue: Component): void {
   _Vue.mixin({
-    beforeCreate: function() {
+    beforeCreate: function () {
       this.__emitted = Object.create(null)
       this.__emittedByOrder = []
       logEvents(this, this.__emitted, this.__emittedByOrder)
diff --git a/packages/shared/validators.js b/packages/shared/validators.js
index 986049d33..c72591d22 100644
--- a/packages/shared/validators.js
+++ b/packages/shared/validators.js
@@ -137,10 +137,10 @@ function makeMap(str: string, expectsLowerCase?: boolean) {
     map[list[i]] = true
   }
   return expectsLowerCase
-    ? function(val: string) {
+    ? function (val: string) {
         return map[val.toLowerCase()]
       }
-    : function(val: string) {
+    : function (val: string) {
         return map[val]
       }
 }
diff --git a/packages/test-utils/src/wrapper-array.js b/packages/test-utils/src/wrapper-array.js
index f5bd64bf7..e29cb2bed 100644
--- a/packages/test-utils/src/wrapper-array.js
+++ b/packages/test-utils/src/wrapper-array.js
@@ -5,7 +5,7 @@ import type VueWrapper from './vue-wrapper'
 import { throwError } from 'shared/util'
 
 export default class WrapperArray implements BaseWrapper {
-  +wrappers: Array<Wrapper | VueWrapper>
+  +wrappers: Array<Wrapper | VueWrapper>;
   +length: number
   selector: Selector | void
 
diff --git a/packages/test-utils/src/wrapper.js b/packages/test-utils/src/wrapper.js
index bbaae815a..bcf7985ef 100644
--- a/packages/test-utils/src/wrapper.js
+++ b/packages/test-utils/src/wrapper.js
@@ -29,11 +29,11 @@ import createDOMEvent from './create-dom-event'
 import { throwIfInstancesThrew } from './error'
 
 export default class Wrapper implements BaseWrapper {
-  +vnode: VNode | null
+  +vnode: VNode | null;
   +vm: Component | void
   _emitted: { [name: string]: Array<Array<any>> }
-  _emittedByOrder: Array<{ name: string, args: Array<any> }>
-  +element: Element
+  _emittedByOrder: Array<{ name: string, args: Array<any> }>;
+  +element: Element;
   +options: WrapperOptions
   isFunctionalComponent: boolean
   rootNode: VNode | Element
@@ -502,9 +502,7 @@ export default class Wrapper implements BaseWrapper {
         ? value.map((calledWith, index) => {
             const callParams = calledWith.map(param =>
               typeof param === 'object'
-                ? JSON.stringify(param)
-                    .replace(/"/g, '')
-                    .replace(/,/g, ', ')
+                ? JSON.stringify(param).replace(/"/g, '').replace(/,/g, ', ')
                 : param
             )
 
diff --git a/test/resources/components/component-with-computed.vue b/test/resources/components/component-with-computed.vue
index 02445747a..d608e4885 100644
--- a/test/resources/components/component-with-computed.vue
+++ b/test/resources/components/component-with-computed.vue
@@ -11,11 +11,8 @@ export default {
     message: 'egassem'
   }),
   computed: {
-    reversedMessage: function() {
-      return this.message
-        .split('')
-        .reverse()
-        .join('')
+    reversedMessage: function () {
+      return this.message.split('').reverse().join('')
     }
   }
 }
diff --git a/test/resources/components/component-with-transitions.vue b/test/resources/components/component-with-transitions.vue
index 9af326ce4..e8965da44 100644
--- a/test/resources/components/component-with-transitions.vue
+++ b/test/resources/components/component-with-transitions.vue
@@ -1,9 +1,7 @@
 <template>
   <div>
     <transition>
-      <span v-if="!expanded" data-testid="expanded">
-        Content
-      </span>
+      <span v-if="!expanded" data-testid="expanded"> Content </span>
     </transition>
   </div>
 </template>
diff --git a/test/resources/components/component-with-watch-immediate.vue b/test/resources/components/component-with-watch-immediate.vue
index f8abce285..736be6939 100644
--- a/test/resources/components/component-with-watch-immediate.vue
+++ b/test/resources/components/component-with-watch-immediate.vue
@@ -6,7 +6,7 @@
 
 <script>
 export default {
-  data: function() {
+  data: function () {
     return {
       data1: null
     }
diff --git a/test/resources/components/component-with-watch.vue b/test/resources/components/component-with-watch.vue
index 9e491c259..beb42b08b 100644
--- a/test/resources/components/component-with-watch.vue
+++ b/test/resources/components/component-with-watch.vue
@@ -7,7 +7,7 @@
 
 <script>
 export default {
-  data: function() {
+  data: function () {
     return {
       data1: 'default data1',
       data2: 'default data2'
diff --git a/test/resources/test-mixin.js b/test/resources/test-mixin.js
index 903ae53a6..7121d96ae 100644
--- a/test/resources/test-mixin.js
+++ b/test/resources/test-mixin.js
@@ -1,3 +1,3 @@
 export default {
-  created: function() {}
+  created: function () {}
 }
diff --git a/test/resources/utils.js b/test/resources/utils.js
index b265c94e6..e4e9d8ebc 100644
--- a/test/resources/utils.js
+++ b/test/resources/utils.js
@@ -44,13 +44,13 @@ export function describeWithShallowAndMount(spec, cb) {
   }
 }
 
-describeWithShallowAndMount.skip = function(spec, cb) {
+describeWithShallowAndMount.skip = function (spec, cb) {
   shallowAndMount.forEach(method => {
     describe.skip(`${spec} with ${method.name}`, () => cb(method))
   })
 }
 
-describeWithShallowAndMount.only = function(spec, cb) {
+describeWithShallowAndMount.only = function (spec, cb) {
   shallowAndMount.forEach(method => {
     describe.only(`${spec} with ${method.name}`, () => cb(method))
   })
@@ -62,13 +62,13 @@ export function describeWithMountingMethods(spec, cb) {
   })
 }
 
-describeWithMountingMethods.skip = function(spec, cb) {
+describeWithMountingMethods.skip = function (spec, cb) {
   shallowMountAndRender.forEach(method => {
     describe.skip(`${spec} with ${method.name}`, () => cb(method))
   })
 }
 
-describeWithMountingMethods.only = function(spec, cb) {
+describeWithMountingMethods.only = function (spec, cb) {
   shallowMountAndRender.forEach(method => {
     describe.only(`${spec} with ${method.name}`, () => cb(method))
   })
diff --git a/test/specs/create-local-vue.spec.js b/test/specs/create-local-vue.spec.js
index 47ea048c3..ae2e240d2 100644
--- a/test/specs/create-local-vue.spec.js
+++ b/test/specs/create-local-vue.spec.js
@@ -101,7 +101,7 @@ describeWithShallowAndMount('createLocalVue', mountingMethod => {
     const localVue = createLocalVue()
     const pluginOptions = { foo: 'bar' }
     const plugin = {
-      install: function(_Vue, options) {
+      install: function (_Vue, options) {
         expect(options).toEqual(pluginOptions)
       }
     }
@@ -112,7 +112,7 @@ describeWithShallowAndMount('createLocalVue', mountingMethod => {
     let installCount = 0
 
     class Plugin {}
-    Plugin.install = function(_Vue) {
+    Plugin.install = function (_Vue) {
       if (_Vue._installedPlugins) {
         expect(_Vue._installedPlugins.indexOf(Plugin)).toEqual(-1)
       }
diff --git a/test/specs/mount.spec.js b/test/specs/mount.spec.js
index 8b3b71f3e..e8bc09165 100644
--- a/test/specs/mount.spec.js
+++ b/test/specs/mount.spec.js
@@ -284,7 +284,7 @@ describeRunIf(process.env.TEST_ENV !== 'node', 'mount', () => {
   it('propagates errors when they are thrown', () => {
     const TestComponent = {
       template: '<div></div>',
-      mounted: function() {
+      mounted: function () {
         throw new Error('Error in mounted')
       }
     }
@@ -296,12 +296,12 @@ describeRunIf(process.env.TEST_ENV !== 'node', 'mount', () => {
   it('propagates errors when they are thrown by a nested component', () => {
     const childComponent = {
       template: '<div></div>',
-      mounted: function() {
+      mounted: function () {
         throw new Error('Error in mounted')
       }
     }
     const rootComponent = {
-      render: function(h) {
+      render: function (h) {
         return h('div', [h(childComponent)])
       }
     }
diff --git a/test/specs/mounting-options/scopedSlots.spec.js b/test/specs/mounting-options/scopedSlots.spec.js
index e50b9c78e..437f0bb68 100644
--- a/test/specs/mounting-options/scopedSlots.spec.js
+++ b/test/specs/mounting-options/scopedSlots.spec.js
@@ -32,7 +32,7 @@ describeWithShallowAndMount('scopedSlots', mountingMethod => {
       },
       {
         scopedSlots: {
-          single: function(props) {
+          single: function (props) {
             return this.$createElement('p', props.text)
           }
         }
@@ -47,7 +47,7 @@ describeWithShallowAndMount('scopedSlots', mountingMethod => {
     () => {
       const destructuringWrapper = mountingMethod(
         {
-          render: function() {
+          render: function () {
             return this.$scopedSlots.default({
               index: 1,
               item: 'foo'
@@ -65,7 +65,7 @@ describeWithShallowAndMount('scopedSlots', mountingMethod => {
 
       const notDestructuringWrapper = mountingMethod(
         {
-          render: function() {
+          render: function () {
             return this.$scopedSlots.named({
               index: 1,
               item: 'foo'
@@ -89,7 +89,7 @@ describeWithShallowAndMount('scopedSlots', mountingMethod => {
       const destructuringWrapper = mountingMethod(
         {
           functional: true,
-          render: function(createElement, context) {
+          render: function (createElement, context) {
             return context.data.scopedSlots.default({
               index: 1,
               item: 'foo'
@@ -108,7 +108,7 @@ describeWithShallowAndMount('scopedSlots', mountingMethod => {
       const notDestructuringWrapper = mountingMethod(
         {
           functional: true,
-          render: function(createElement, context) {
+          render: function (createElement, context) {
             return context.data.scopedSlots.named({
               index: 1,
               item: 'foo'
@@ -130,8 +130,7 @@ describeWithShallowAndMount('scopedSlots', mountingMethod => {
       slots: { default: '<span>123</span>' },
       scopedSlots: {
         destructuring: '<p slot-scope="{ index, item }">{{index}},{{item}}</p>',
-        list:
-          '<template slot-scope="foo"><p>{{foo.index}},{{foo.text}}</p></template>',
+        list: '<template slot-scope="foo"><p>{{foo.index}},{{foo.text}}</p></template>',
         single: '<p slot-scope="bar">{{bar.text}}</p>',
         noProps: '<p slot-scope="baz">baz</p>'
       }
diff --git a/test/specs/shallow-mount.spec.js b/test/specs/shallow-mount.spec.js
index 4e5ce3ffe..a487e76a3 100644
--- a/test/specs/shallow-mount.spec.js
+++ b/test/specs/shallow-mount.spec.js
@@ -554,7 +554,7 @@ describeRunIf(process.env.TEST_ENV !== 'node', 'shallowMount', () => {
   )
 
   it('stubs components registered on localVue after multiple installs', () => {
-    const myPlugin = function(_Vue, opts) {
+    const myPlugin = function (_Vue, opts) {
       _Vue.mixin({})
     }
     const localVue = createLocalVue()
@@ -574,7 +574,7 @@ describeRunIf(process.env.TEST_ENV !== 'node', 'shallowMount', () => {
     expect(() =>
       shallowMount({
         template: '<div></div>',
-        mounted: function() {
+        mounted: function () {
           throw new Error('Error')
         }
       })
diff --git a/test/specs/wrapper-array/at.spec.js b/test/specs/wrapper-array/at.spec.js
index 90dcf1b2d..e24889c5f 100644
--- a/test/specs/wrapper-array/at.spec.js
+++ b/test/specs/wrapper-array/at.spec.js
@@ -6,9 +6,7 @@ describeWithShallowAndMount('at', mountingMethod => {
     const TestComponent = {
       template: '<div><p /><p class="index-1"/></div>'
     }
-    const p = mountingMethod(TestComponent)
-      .findAll('p')
-      .at(1)
+    const p = mountingMethod(TestComponent).findAll('p').at(1)
     expect(p.vnode).toBeTruthy()
     expect(p.classes()).toContain('index-1')
   })
@@ -32,11 +30,9 @@ describeWithShallowAndMount('at', mountingMethod => {
       template: '<div><p /><p class="index-1"/></div>'
     }
     const message = `[vue-test-utils]: no item exists at ${index}`
-    expect(() =>
-      mountingMethod(TestComponent)
-        .findAll('p')
-        .at(index)
-    ).toThrow(message)
+    expect(() => mountingMethod(TestComponent).findAll('p').at(index)).toThrow(
+      message
+    )
   })
 
   it('throws error if no item exists at negative index', () => {
@@ -45,10 +41,8 @@ describeWithShallowAndMount('at', mountingMethod => {
       template: '<div><p /><p class="index-1"/></div>'
     }
     const message = `[vue-test-utils]: no item exists at -3 (normalized to -1)`
-    expect(() =>
-      mountingMethod(TestComponent)
-        .findAll('p')
-        .at(index)
-    ).toThrow(message)
+    expect(() => mountingMethod(TestComponent).findAll('p').at(index)).toThrow(
+      message
+    )
   })
 })
diff --git a/test/specs/wrapper-array/attributes.spec.js b/test/specs/wrapper-array/attributes.spec.js
index 855bdb2a3..8fcba16c8 100644
--- a/test/specs/wrapper-array/attributes.spec.js
+++ b/test/specs/wrapper-array/attributes.spec.js
@@ -8,9 +8,7 @@ describeWithShallowAndMount('attributes', mountingMethod => {
     }
     const message = '[vue-test-utils]: attributes cannot be called on 0 items'
     expect(() =>
-      mountingMethod(TestComponent)
-        .findAll('p')
-        .attributes('p')
+      mountingMethod(TestComponent).findAll('p').attributes('p')
     ).toThrow(message)
   })
 
diff --git a/test/specs/wrapper-array/classes.spec.js b/test/specs/wrapper-array/classes.spec.js
index 780b69a6c..9fb76c884 100644
--- a/test/specs/wrapper-array/classes.spec.js
+++ b/test/specs/wrapper-array/classes.spec.js
@@ -8,9 +8,7 @@ describeWithShallowAndMount('classes', mountingMethod => {
     }
     const message = '[vue-test-utils]: classes cannot be called on 0 items'
     expect(() =>
-      mountingMethod(TestComponent)
-        .findAll('p')
-        .classes('p')
+      mountingMethod(TestComponent).findAll('p').classes('p')
     ).toThrow(message)
   })
 
diff --git a/test/specs/wrapper-array/contains.spec.js b/test/specs/wrapper-array/contains.spec.js
index dd6ddbecc..21d591156 100644
--- a/test/specs/wrapper-array/contains.spec.js
+++ b/test/specs/wrapper-array/contains.spec.js
@@ -12,7 +12,9 @@ describeWithShallowAndMount('contains', mountingMethod => {
   })
 
   it('returns false if any Wrapper does not contain element', () => {
-    const TestComponent = { template: '<div><div></div><div><p /></div></div>' }
+    const TestComponent = {
+      template: '<div><div></div><div><p /></div></div>'
+    }
     const wrapper = mountingMethod(TestComponent)
     const divArr = wrapper.findAll('div')
     expect(divArr.contains('p')).toEqual(false)
@@ -22,9 +24,7 @@ describeWithShallowAndMount('contains', mountingMethod => {
     const TestComponent = { template: '<div />' }
     const message = '[vue-test-utils]: contains cannot be called on 0 items'
     expect(() =>
-      mountingMethod(TestComponent)
-        .findAll('p')
-        .contains('p')
+      mountingMethod(TestComponent).findAll('p').contains('p')
     ).toThrow(message)
   })
 
diff --git a/test/specs/wrapper-array/find.spec.js b/test/specs/wrapper-array/find.spec.js
index 3c902c9de..bdc3cca98 100644
--- a/test/specs/wrapper-array/find.spec.js
+++ b/test/specs/wrapper-array/find.spec.js
@@ -7,11 +7,9 @@ describeWithShallowAndMount('find', mountingMethod => {
       template: '<div />'
     }
     const message = '[vue-test-utils]: find cannot be called on 0 items'
-    expect(() =>
-      mountingMethod(TestComponent)
-        .findAll('p')
-        .find('p')
-    ).toThrow(message)
+    expect(() => mountingMethod(TestComponent).findAll('p').find('p')).toThrow(
+      message
+    )
   })
 
   it('throws an error when called on a WrapperArray', () => {
diff --git a/test/specs/wrapper-array/findAll.spec.js b/test/specs/wrapper-array/findAll.spec.js
index ae8efcbe5..4add6780e 100644
--- a/test/specs/wrapper-array/findAll.spec.js
+++ b/test/specs/wrapper-array/findAll.spec.js
@@ -6,11 +6,9 @@ describeWithShallowAndMount('findAll', mountingMethod => {
   it('throws error if wrapper array contains no items', () => {
     const compiled = compileToFunctions('<div />')
     const message = '[vue-test-utils]: findAll cannot be called on 0 items'
-    expect(() =>
-      mountingMethod(compiled)
-        .findAll('p')
-        .findAll('p')
-    ).toThrow(message)
+    expect(() => mountingMethod(compiled).findAll('p').findAll('p')).toThrow(
+      message
+    )
   })
 
   it('throws an error when called on a WrapperArray', () => {
diff --git a/test/specs/wrapper-array/html.spec.js b/test/specs/wrapper-array/html.spec.js
index 68d6d929b..75fc9d720 100644
--- a/test/specs/wrapper-array/html.spec.js
+++ b/test/specs/wrapper-array/html.spec.js
@@ -6,11 +6,9 @@ describeWithShallowAndMount('html', mountingMethod => {
   it('throws error if wrapper array contains no items', () => {
     const compiled = compileToFunctions('<div />')
     const message = '[vue-test-utils]: html cannot be called on 0 items'
-    expect(() =>
-      mountingMethod(compiled)
-        .findAll('p')
-        .html('p')
-    ).toThrow(message)
+    expect(() => mountingMethod(compiled).findAll('p').html('p')).toThrow(
+      message
+    )
   })
 
   it('throws error when called on a WrapperArray', () => {
diff --git a/test/specs/wrapper-array/is.spec.js b/test/specs/wrapper-array/is.spec.js
index 8f2095dca..7c6b7d53e 100644
--- a/test/specs/wrapper-array/is.spec.js
+++ b/test/specs/wrapper-array/is.spec.js
@@ -33,10 +33,7 @@ describeWithShallowAndMount('is', mountingMethod => {
   it('throws error if wrapper array contains no items', () => {
     const compiled = compileToFunctions('<div />')
     const message = '[vue-test-utils]: is cannot be called on 0 items'
-    const fn = () =>
-      mountingMethod(compiled)
-        .findAll('p')
-        .is('p')
+    const fn = () => mountingMethod(compiled).findAll('p').is('p')
     expect(fn).toThrow(message)
   })
 
diff --git a/test/specs/wrapper-array/isEmpty.spec.js b/test/specs/wrapper-array/isEmpty.spec.js
index fa1017ad6..3f2cab301 100644
--- a/test/specs/wrapper-array/isEmpty.spec.js
+++ b/test/specs/wrapper-array/isEmpty.spec.js
@@ -20,10 +20,7 @@ describeWithShallowAndMount('isEmpty', mountingMethod => {
   it('throws error if wrapper array contains no items', () => {
     const compiled = compileToFunctions('<div />')
     const message = '[vue-test-utils]: isEmpty cannot be called on 0 items'
-    const fn = () =>
-      mountingMethod(compiled)
-        .findAll('p')
-        .isEmpty('p')
+    const fn = () => mountingMethod(compiled).findAll('p').isEmpty('p')
     expect(fn).toThrow(message)
   })
 })
diff --git a/test/specs/wrapper-array/isVisible.spec.js b/test/specs/wrapper-array/isVisible.spec.js
index e6077759c..4aa924c91 100644
--- a/test/specs/wrapper-array/isVisible.spec.js
+++ b/test/specs/wrapper-array/isVisible.spec.js
@@ -31,10 +31,7 @@ describeWithShallowAndMount('isVisible', mountingMethod => {
   it('throws error if wrapper array contains no items', () => {
     const compiled = compileToFunctions('<div />')
     const message = '[vue-test-utils]: isVisible cannot be called on 0 items'
-    const fn = () =>
-      mountingMethod(compiled)
-        .findAll('p')
-        .isVisible('p')
+    const fn = () => mountingMethod(compiled).findAll('p').isVisible('p')
     expect(fn).toThrow(message)
   })
 })
diff --git a/test/specs/wrapper-array/isVueInstance.spec.js b/test/specs/wrapper-array/isVueInstance.spec.js
index 7599e2cef..b553c2e0a 100644
--- a/test/specs/wrapper-array/isVueInstance.spec.js
+++ b/test/specs/wrapper-array/isVueInstance.spec.js
@@ -19,10 +19,7 @@ describeWithShallowAndMount('isVueInstance', mountingMethod => {
     const compiled = compileToFunctions('<div />')
     const message =
       '[vue-test-utils]: isVueInstance cannot be called on 0 items'
-    const fn = () =>
-      mountingMethod(compiled)
-        .findAll('p')
-        .isVueInstance('p')
+    const fn = () => mountingMethod(compiled).findAll('p').isVueInstance('p')
     expect(fn).toThrow(message)
   })
 })
diff --git a/test/specs/wrapper-array/name.spec.js b/test/specs/wrapper-array/name.spec.js
index 7859f2b15..8f1962649 100644
--- a/test/specs/wrapper-array/name.spec.js
+++ b/test/specs/wrapper-array/name.spec.js
@@ -14,10 +14,7 @@ describeWithShallowAndMount('name', mountingMethod => {
   it('throws error if wrapper array contains no items', () => {
     const compiled = compileToFunctions('<div />')
     const message = '[vue-test-utils]: name cannot be called on 0 items'
-    const fn = () =>
-      mountingMethod(compiled)
-        .findAll('p')
-        .name('p')
+    const fn = () => mountingMethod(compiled).findAll('p').name('p')
     expect(fn).toThrow(message)
   })
 })
diff --git a/test/specs/wrapper-array/props.spec.js b/test/specs/wrapper-array/props.spec.js
index e3584bb12..903c3c051 100644
--- a/test/specs/wrapper-array/props.spec.js
+++ b/test/specs/wrapper-array/props.spec.js
@@ -6,11 +6,9 @@ describeWithShallowAndMount('props', mountingMethod => {
   it('throws error if wrapper array contains no items', () => {
     const compiled = compileToFunctions('<div />')
     const message = '[vue-test-utils]: props cannot be called on 0 items'
-    expect(() =>
-      mountingMethod(compiled)
-        .findAll('p')
-        .props('p')
-    ).toThrow(message)
+    expect(() => mountingMethod(compiled).findAll('p').props('p')).toThrow(
+      message
+    )
   })
 
   it('throws error when called on a WrapperArray', () => {
diff --git a/test/specs/wrapper-array/setData.spec.js b/test/specs/wrapper-array/setData.spec.js
index f7833f607..6c7ed6333 100644
--- a/test/specs/wrapper-array/setData.spec.js
+++ b/test/specs/wrapper-array/setData.spec.js
@@ -24,10 +24,7 @@ describeWithShallowAndMount('setData', mountingMethod => {
   it('throws error if wrapper array contains no items', () => {
     const compiled = compileToFunctions('<div />')
     const message = '[vue-test-utils]: setData cannot be called on 0 items'
-    const fn = () =>
-      mountingMethod(compiled)
-        .findAll('p')
-        .setData('p')
+    const fn = () => mountingMethod(compiled).findAll('p').setData('p')
     expect(fn).toThrow(message)
   })
 })
diff --git a/test/specs/wrapper-array/setProps.spec.js b/test/specs/wrapper-array/setProps.spec.js
index 20556f041..7827bbb41 100644
--- a/test/specs/wrapper-array/setProps.spec.js
+++ b/test/specs/wrapper-array/setProps.spec.js
@@ -37,10 +37,7 @@ describeWithShallowAndMount('setProps', mountingMethod => {
   it('throws error if wrapper array contains no items', () => {
     const compiled = compileToFunctions('<div />')
     const message = '[vue-test-utils]: setProps cannot be called on 0 items'
-    const fn = () =>
-      mountingMethod(compiled)
-        .findAll('p')
-        .setProps('p')
+    const fn = () => mountingMethod(compiled).findAll('p').setProps('p')
     expect(fn).toThrow(message)
   })
 })
diff --git a/test/specs/wrapper-array/text.spec.js b/test/specs/wrapper-array/text.spec.js
index 868d74492..1bc5ddc89 100644
--- a/test/specs/wrapper-array/text.spec.js
+++ b/test/specs/wrapper-array/text.spec.js
@@ -15,10 +15,7 @@ describeWithShallowAndMount('text', mountingMethod => {
   it('throws error if wrapper array contains no items', () => {
     const compiled = compileToFunctions('<div />')
     const message = '[vue-test-utils]: text cannot be called on 0 items'
-    const fn = () =>
-      mountingMethod(compiled)
-        .findAll('p')
-        .text('p')
+    const fn = () => mountingMethod(compiled).findAll('p').text('p')
     expect(fn).toThrow(message)
   })
 })
diff --git a/test/specs/wrapper-array/trigger.spec.js b/test/specs/wrapper-array/trigger.spec.js
index 648adba1c..44e3bff92 100644
--- a/test/specs/wrapper-array/trigger.spec.js
+++ b/test/specs/wrapper-array/trigger.spec.js
@@ -83,10 +83,7 @@ describeWithShallowAndMount('trigger', mountingMethod => {
   it('throws error if wrapper array contains no items', () => {
     const compiled = compileToFunctions('<div />')
     const message = '[vue-test-utils]: trigger cannot be called on 0 items'
-    const fn = () =>
-      mountingMethod(compiled)
-        .findAll('p')
-        .trigger('p')
+    const fn = () => mountingMethod(compiled).findAll('p').trigger('p')
     expect(fn).toThrow(message)
   })
 })
diff --git a/test/specs/wrapper/emittedByOrder.spec.js b/test/specs/wrapper/emittedByOrder.spec.js
index 0c6e93368..5e2ff685f 100644
--- a/test/specs/wrapper/emittedByOrder.spec.js
+++ b/test/specs/wrapper/emittedByOrder.spec.js
@@ -44,13 +44,13 @@ describeWithShallowAndMount('emittedByOrder', mountingMethod => {
   it('captures in lifecycle hooks emitted events in order', () => {
     const wrapper = mountingMethod({
       render: h => h('div'),
-      beforeCreate: function() {
+      beforeCreate: function () {
         this.$emit('foo')
       },
-      created: function() {
+      created: function () {
         this.$emit('bar', 1, 2, 3)
       },
-      mounted: function() {
+      mounted: function () {
         this.$emit('foo', 2, 3, 4)
       }
     })
diff --git a/test/specs/wrapper/find.spec.js b/test/specs/wrapper/find.spec.js
index 861551317..87cafc7b6 100644
--- a/test/specs/wrapper/find.spec.js
+++ b/test/specs/wrapper/find.spec.js
@@ -379,12 +379,7 @@ describeWithShallowAndMount('find', mountingMethod => {
       }
     }
     const wrapper = mountingMethod(TestComponent)
-    expect(
-      wrapper
-        .find('svg')
-        .find('svg')
-        .exists()
-    ).toEqual(true)
+    expect(wrapper.find('svg').find('svg').exists()).toEqual(true)
   })
 
   it('throws errror when searching for a component on an element Wrapper', () => {
@@ -397,10 +392,7 @@ describeWithShallowAndMount('find', mountingMethod => {
         })
       }
     }
-    const fn = () =>
-      mountingMethod(TestComponent)
-        .find('svg')
-        .find(Component)
+    const fn = () => mountingMethod(TestComponent).find('svg').find(Component)
     const message =
       '[vue-test-utils]: cannot find a Vue instance on a DOM node. The node you are calling find on does not exist in the VDom. Are you adding the node as innerHTML?'
     expect(fn).toThrow(message)
@@ -417,9 +409,7 @@ describeWithShallowAndMount('find', mountingMethod => {
       }
     }
     const fn = () =>
-      mountingMethod(TestComponent)
-        .find('svg')
-        .find({ ref: 'some-ref' })
+      mountingMethod(TestComponent).find('svg').find({ ref: 'some-ref' })
     const message =
       '[vue-test-utils]: cannot find a Vue instance on a DOM node. The node you are calling find on does not exist in the VDom. Are you adding the node as innerHTML?'
     expect(fn).toThrow(message)
@@ -656,7 +646,7 @@ describeWithShallowAndMount('find', mountingMethod => {
     const TestComponent = {
       template: '<child-component v-if="renderChild" />',
       components: { ChildComponent },
-      data: function() {
+      data: function () {
         return {
           renderChild: false
         }
diff --git a/test/specs/wrapper/findAll.spec.js b/test/specs/wrapper/findAll.spec.js
index 94aa783d7..c973f2ec6 100644
--- a/test/specs/wrapper/findAll.spec.js
+++ b/test/specs/wrapper/findAll.spec.js
@@ -156,12 +156,7 @@ describeWithShallowAndMount('findAll', mountingMethod => {
     }
     const wrapper = mountingMethod(RootComponent)
     expect(wrapper.findAllComponents('.foo')).toHaveLength(1)
-    expect(
-      wrapper
-        .findAllComponents('.foo')
-        .at(0)
-        .is(Component)
-    ).toBe(true)
+    expect(wrapper.findAllComponents('.foo').at(0).is(Component)).toBe(true)
   })
 
   it('findAllComponents returns top-level components when components are nested', () => {
diff --git a/test/specs/wrapper/overview.spec.js b/test/specs/wrapper/overview.spec.js
index 20efc9bad..d977e5eca 100644
--- a/test/specs/wrapper/overview.spec.js
+++ b/test/specs/wrapper/overview.spec.js
@@ -75,7 +75,9 @@ describeWithShallowAndMount('overview', mountingMethod => {
 
     describe('vibility', () => {
       it('prints "Visible" when the wrapper is visible', () => {
-        const wrapper = mountingMethod({ template: '<div class="test"></div>' })
+        const wrapper = mountingMethod({
+          template: '<div class="test"></div>'
+        })
 
         const expectedConsoleOutput = [
           '',
@@ -98,7 +100,9 @@ describeWithShallowAndMount('overview', mountingMethod => {
       })
 
       it('prints "Not Visible" when the wrapper is not visible', () => {
-        const wrapper = mountingMethod({ template: '<div class="test"></div>' })
+        const wrapper = mountingMethod({
+          template: '<div class="test"></div>'
+        })
 
         const expectedConsoleOutput = [
           '',
diff --git a/test/specs/wrapper/props.spec.js b/test/specs/wrapper/props.spec.js
index 41e9d47cb..7ced78ee5 100644
--- a/test/specs/wrapper/props.spec.js
+++ b/test/specs/wrapper/props.spec.js
@@ -79,9 +79,7 @@ describeWithShallowAndMount('props', mountingMethod => {
 
   it('throws an error if called on a non vm wrapper', () => {
     const compiled = compileToFunctions('<div><p /></div>')
-    const p = mountingMethod(compiled)
-      .findAll('p')
-      .at(0)
+    const p = mountingMethod(compiled).findAll('p').at(0)
     const message =
       '[vue-test-utils]: wrapper.props() must be called on a Vue instance'
     const fn = () => p.props()
diff --git a/test/specs/wrapper/setData.spec.js b/test/specs/wrapper/setData.spec.js
index a7ac5681a..8c9c9e90f 100644
--- a/test/specs/wrapper/setData.spec.js
+++ b/test/specs/wrapper/setData.spec.js
@@ -140,11 +140,8 @@ describeWithShallowAndMount('setData', mountingMethod => {
         message: 'egassem'
       }),
       computed: {
-        reversedMessage: function() {
-          return this.message
-            .split('')
-            .reverse()
-            .join('')
+        reversedMessage: function () {
+          return this.message.split('').reverse().join('')
         }
       }
     }
diff --git a/test/specs/wrapper/setProps.spec.js b/test/specs/wrapper/setProps.spec.js
index 5f753be47..e4084cf1c 100644
--- a/test/specs/wrapper/setProps.spec.js
+++ b/test/specs/wrapper/setProps.spec.js
@@ -92,7 +92,7 @@ describeWithShallowAndMount('setProps', mountingMethod => {
           mounted() {
             this.$watch(
               'propA',
-              function() {
+              function () {
                 this.propA
               },
               { immediate: true }
@@ -159,11 +159,8 @@ describeWithShallowAndMount('setProps', mountingMethod => {
           </div>
         `,
         computed: {
-          reversedMessage: function() {
-            return this.message
-              .split('')
-              .reverse()
-              .join('')
+          reversedMessage: function () {
+            return this.message.split('').reverse().join('')
           }
         },
         props: ['message']
@@ -194,7 +191,7 @@ describeWithShallowAndMount('setProps', mountingMethod => {
           mounted() {
             this.$watch(
               'propA',
-              function() {
+              function () {
                 callback()
               },
               { immediate: true }
@@ -223,7 +220,7 @@ describeWithShallowAndMount('setProps', mountingMethod => {
           mounted() {
             this.$watch(
               'propA',
-              function() {
+              function () {
                 callback()
               },
               { immediate: true }
diff --git a/yarn.lock b/yarn.lock
index 176108856..ed67d5d21 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -10886,11 +10886,16 @@ prepend-http@^2.0.0:
   resolved "https://registry.yarnpkg.com/prepend-http/-/prepend-http-2.0.0.tgz#e92434bfa5ea8c19f41cdfd401d741a3c819d897"
   integrity sha1-6SQ0v6XqjBn0HN/UAddBo8gZ2Jc=
 
-prettier@^1.16.0, prettier@^1.18.2:
+prettier@^1.18.2:
   version "1.19.1"
   resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.19.1.tgz#f7d7f5ff8a9cd872a7be4ca142095956a60797cb"
   integrity sha512-s7PoyDv/II1ObgQunCbB9PdLmUcBZcnWOcxDh7O0N/UwDEsHyqkW+Qh28jW+mVuCdx7gLB0BotYI1Y6uI9iyew==
 
+prettier@^2.8.1:
+  version "2.8.3"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-2.8.3.tgz#ab697b1d3dd46fb4626fbe2f543afe0cc98d8632"
+  integrity sha512-tJ/oJ4amDihPoufT5sM0Z1SKEuKay8LfVAMlbbhnnkvt6BUserZylqo2PN+p9KeljLr0OHa2rXHU1T8reeoTrw==
+
 pretty-bytes@^5.1.0:
   version "5.3.0"
   resolved "https://registry.yarnpkg.com/pretty-bytes/-/pretty-bytes-5.3.0.tgz#f2849e27db79fb4d6cfe24764fc4134f165989f2"