refactor: @nuxt/utils (#4609)

distributions/nuxt-legacy/package.json

@@ -50,7 +50,6 @@
     "@babel/register": "^7.0.0",
     "@nuxt/builder": "2.3.4",
     "@nuxt/cli": "2.3.4",
-    "@nuxt/common": "2.3.4",
     "@nuxt/core": "2.3.4",
     "@nuxt/generator": "2.3.4",
     "@nuxt/opencollective": "^0.2.1",

distributions/nuxt-start/package.json

@@ -47,7 +47,6 @@
   "bin": "bin/nuxt-start.js",
   "dependencies": {
     "@nuxt/cli": "2.3.4",
-    "@nuxt/common": "2.3.4",
     "@nuxt/core": "2.3.4"
   },
   "engines": {

distributions/nuxt/package.json

@@ -50,7 +50,6 @@
   "dependencies": {
     "@nuxt/builder": "2.3.4",
     "@nuxt/cli": "2.3.4",
-    "@nuxt/common": "2.3.4",
     "@nuxt/core": "2.3.4",
     "@nuxt/generator": "2.3.4",
     "@nuxt/opencollective": "^0.2.1",

packages/builder/package.json

@@ -8,8 +8,8 @@
   ],
   "main": "dist/builder.js",
   "dependencies": {
-    "@nuxt/common": "2.3.4",
     "@nuxt/devalue": "^1.2.0",
+    "@nuxt/utils": "2.3.4",
     "@nuxt/vue-app": "2.3.4",
     "chokidar": "^2.0.4",
     "consola": "^2.3.0",

packages/builder/src/builder.js

@@ -27,7 +27,7 @@ import {
   determineGlobals,
   stripWhitespace,
   isString
-} from '@nuxt/common'
+} from '@nuxt/utils'
 
 import BuildContext from './context'
 

packages/common/CHANGELOG.md

@@ -1,11 +0,0 @@
-# Change Log
-
-All notable changes to this project will be documented in this file.
-See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
-
-## [2.3.4](https://github.com/nuxt/nuxt.js/compare/v2.3.2...v2.3.4) (2018-11-26)
-
-
-### Performance Improvements
-
-* **pkg:** remove lodash dependency from packages ([#4411](https://github.com/nuxt/nuxt.js/issues/4411)) ([7e1beed](https://github.com/nuxt/nuxt.js/commit/7e1beed))

packages/common/data/modern-browsers.json

@@ -1,12 +0,0 @@
-{
-  "Edge": "16",
-  "Firefox": "60",
-  "Chrome": "61",
-  "Chrome Headless": "61",
-  "Chromium": "61",
-  "Safari": "10.1",
-  "Opera": "48",
-  "Yandex": "18",
-  "Vivaldi": "1.14",
-  "Mobile Safari": "10.3"
-}

packages/common/src/index.js

@@ -1,3 +0,0 @@
-export { default as Hookable } from './hookable'
-export { default as ModernBrowsers } from '../data/modern-browsers.json'
-export * from './utils'

packages/config/package.json

@@ -8,7 +8,7 @@
   ],
   "main": "dist/config.js",
   "dependencies": {
-    "@nuxt/common": "2.3.4",
+    "@nuxt/utils": "2.3.4",
     "consola": "^2.3.0",
     "std-env": "^2.2.1"
   },

packages/config/src/options.js

@@ -6,7 +6,7 @@ import pick from 'lodash/pick'
 import isObject from 'lodash/isObject'
 import uniq from 'lodash/uniq'
 import consola from 'consola'
-import { guardDir, isNonEmptyString, isPureObject, isUrl } from '@nuxt/common'
+import { guardDir, isNonEmptyString, isPureObject, isUrl } from '@nuxt/utils'
 import { getDefaultNuxtConfig } from './config'
 
 export function getNuxtConfig(_options) {

packages/core/package.json

@@ -8,10 +8,10 @@
   ],
   "main": "dist/core.js",
   "dependencies": {
-    "@nuxt/common": "2.3.4",
     "@nuxt/config": "2.3.4",
     "@nuxt/devalue": "^1.2.0",
     "@nuxt/server": "2.3.4",
+    "@nuxt/utils": "2.3.4",
     "@nuxt/vue-renderer": "2.3.4",
     "consola": "^2.3.0",
     "debug": "^4.1.0",

packages/core/src/hookable.js

@@ -1,7 +1,7 @@
 
 import consola from 'consola'
 
-import { sequence } from './utils'
+import { sequence } from '@nuxt/utils'
 
 export default class Hookable {
   constructor() {

packages/core/src/module.js

@@ -3,7 +3,7 @@ import fs from 'fs'
 import hash from 'hash-sum'
 import consola from 'consola'
 
-import { chainFn, sequence } from '@nuxt/common'
+import { chainFn, sequence } from '@nuxt/utils'
 
 export default class ModuleContainer {
   constructor(nuxt) {

packages/core/src/nuxt.js

@@ -2,12 +2,14 @@
 import isPlainObject from 'lodash/isPlainObject'
 import consola from 'consola'
 
-import { Hookable, defineAlias } from '@nuxt/common'
+import { defineAlias } from '@nuxt/utils'
 import { getNuxtConfig } from '@nuxt/config'
 import { Server } from '@nuxt/server'
 
 import { version } from '../package.json'
+
 import ModuleContainer from './module'
+import Hookable from './hookable'
 import Resolver from './resolver'
 
 export default class Nuxt extends Hookable {

packages/core/src/resolver.js

@@ -3,7 +3,7 @@ import { resolve, join } from 'path'
 import fs from 'fs-extra'
 import esm from 'esm'
 
-import { startsWithRootAlias, startsWithSrcAlias } from '@nuxt/common'
+import { startsWithRootAlias, startsWithSrcAlias } from '@nuxt/utils'
 
 export default class Resolver {
   constructor(nuxt) {

packages/generator/package.json

@@ -8,7 +8,7 @@
   ],
   "main": "dist/generator.js",
   "dependencies": {
-    "@nuxt/common": "2.3.4",
+    "@nuxt/utils": "2.3.4",
     "chalk": "^2.4.1",
     "consola": "^2.3.0",
     "fs-extra": "^7.0.1",

packages/generator/src/generator.js

@@ -4,7 +4,7 @@ import consola from 'consola'
 import fsExtra from 'fs-extra'
 import htmlMinifier from 'html-minifier'
 
-import { flatRoutes, isUrl, promisifyRoute, waitFor, isString } from '@nuxt/common'
+import { flatRoutes, isUrl, promisifyRoute, waitFor, isString } from '@nuxt/utils'
 
 export default class Generator {
   constructor(nuxt, builder) {

packages/server/package.json

@@ -8,8 +8,8 @@
   ],
   "main": "dist/server.js",
   "dependencies": {
-    "@nuxt/common": "2.3.4",
     "@nuxt/config": "2.3.4",
+    "@nuxt/utils": "2.3.4",
     "@nuxtjs/youch": "^4.2.3",
     "chalk": "^2.4.1",
     "compression": "^1.7.3",

packages/server/src/jsdom.js

@@ -1,5 +1,5 @@
 import consola from 'consola'
-import { timeout } from '@nuxt/common'
+import { timeout } from '@nuxt/utils'
 
 export default async function renderAndGetWindow(
   url = 'http://localhost:3000',

packages/server/src/middleware/modern-browsers.js

@@ -0,0 +1,12 @@
+export default {
+  Edge: '16',
+  Firefox: '60',
+  Chrome: '61',
+  'Chrome Headless': '61',
+  Chromium: '61',
+  Safari: '10.1',
+  Opera: '48',
+  Yandex: '18',
+  Vivaldi: '1.14',
+  'Mobile Safari': '10.3'
+}

packages/server/src/middleware/modern.js

@@ -1,9 +1,10 @@
 import chalk from 'chalk'
 import consola from 'consola'
-import { ModernBrowsers } from '@nuxt/common'
 import UAParser from 'ua-parser-js'
 import semver from 'semver'
 
+import ModernBrowsers from './modern-browsers'
+
 const modernBrowsers = Object.keys(ModernBrowsers)
   .reduce((allBrowsers, browser) => {
     allBrowsers[browser] = semver.coerce(ModernBrowsers[browser])

packages/server/src/middleware/nuxt.js

@@ -2,7 +2,7 @@ import generateETag from 'etag'
 import fresh from 'fresh'
 import consola from 'consola'
 
-import { getContext } from '@nuxt/common'
+import { getContext } from '@nuxt/utils'
 
 export default ({ options, nuxt, renderRoute, resources }) => async function nuxtMiddleware(req, res, next) {
   // Get context

packages/server/src/server.js

@@ -4,7 +4,7 @@ import launchMiddleware from 'launch-editor-middleware'
 import serveStatic from 'serve-static'
 import servePlaceholder from 'serve-placeholder'
 import connect from 'connect'
-import { determineGlobals, isUrl } from '@nuxt/common'
+import { determineGlobals, isUrl } from '@nuxt/utils'
 
 import ServerContext from './context'
 import renderAndGetWindow from './jsdom'

packages/utils/package.json

@@ -1,12 +1,12 @@
 {
-  "name": "@nuxt/common",
+  "name": "@nuxt/utils",
   "version": "2.3.4",
   "repository": "nuxt/nuxt.js",
   "license": "MIT",
   "files": [
     "dist"
   ],
-  "main": "dist/common.js",
+  "main": "dist/utils.js",
   "dependencies": {
     "consola": "^2.3.0",
     "serialize-javascript": "^1.5.0"

packages/utils/src/context.js

@@ -0,0 +1,16 @@
+
+export const getContext = function getContext(req, res) {
+  return { req, res }
+}
+
+export const determineGlobals = function determineGlobals(globalName, globals) {
+  const _globals = {}
+  for (const global in globals) {
+    if (typeof globals[global] === 'function') {
+      _globals[global] = globals[global](globalName)
+    } else {
+      _globals[global] = globals[global]
+    }
+  }
+  return _globals
+}

packages/utils/src/index.js

@@ -0,0 +1,7 @@
+export * from './context'
+export * from './lang'
+export * from './resolve'
+export * from './route'
+export * from './serialize'
+export * from './task'
+export * from './timer'

packages/utils/src/lang.js

@@ -0,0 +1,46 @@
+export const encodeHtml = function encodeHtml(str) {
+  return str.replace(/</g, '&lt;').replace(/>/g, '&gt;')
+}
+
+export const isString = obj => typeof obj === 'string' || obj instanceof String
+
+export const isNonEmptyString = obj => obj && isString(obj)
+
+export const isPureObject = function isPureObject(o) {
+  return !Array.isArray(o) && typeof o === 'object'
+}
+
+export const isUrl = function isUrl(url) {
+  return ['http', '//'].some(str => url.startsWith(str))
+}
+
+export const urlJoin = function urlJoin() {
+  return [].slice
+    .call(arguments)
+    .join('/')
+    .replace(/\/+/g, '/')
+    .replace(':/', '://')
+}
+
+/**
+ * Wraps value in array if it is not already an array
+ *
+ * @param  {any} value
+ * @return {array}
+ */
+export const wrapArray = value => Array.isArray(value) ? value : [value]
+
+const WHITESPACE_REPLACEMENTS = [
+  [/[ \t\f\r]+\n/g, '\n'], // strip empty indents
+  [/{\n{2,}/g, '{\n'], // strip start padding from blocks
+  [/\n{2,}([ \t\f\r]*})/g, '\n$1'], // strip end padding from blocks
+  [/\n{3,}/g, '\n\n'], // strip multiple blank lines (1 allowed)
+  [/\n{2,}$/g, '\n'] // strip blank lines EOF (0 allowed)
+]
+
+export const stripWhitespace = function stripWhitespace(string) {
+  WHITESPACE_REPLACEMENTS.forEach(([regex, newSubstr]) => {
+    string = string.replace(regex, newSubstr)
+  })
+  return string
+}

packages/utils/src/resolve.js

@@ -0,0 +1,100 @@
+import path from 'path'
+import consola from 'consola'
+import escapeRegExp from 'lodash/escapeRegExp'
+
+export const startsWithAlias = aliasArray => str => aliasArray.some(c => str.startsWith(c))
+
+export const startsWithSrcAlias = startsWithAlias(['@', '~'])
+
+export const startsWithRootAlias = startsWithAlias(['@@', '~~'])
+
+export const isWindows = /^win/.test(process.platform)
+
+export const wp = function wp(p = '') {
+  /* istanbul ignore if */
+  if (isWindows) {
+    return p.replace(/\\/g, '\\\\')
+  }
+  return p
+}
+
+export const wChunk = function wChunk(p = '') {
+  /* istanbul ignore if */
+  if (isWindows) {
+    return p.replace(/\//g, '_')
+  }
+  return p
+}
+
+const reqSep = /\//g
+const sysSep = escapeRegExp(path.sep)
+const normalize = string => string.replace(reqSep, sysSep)
+
+export const r = function r(...args) {
+  const lastArg = args[args.length - 1]
+
+  if (startsWithSrcAlias(lastArg)) {
+    return wp(lastArg)
+  }
+
+  return wp(path.resolve(...args.map(normalize)))
+}
+
+export const relativeTo = function relativeTo() {
+  const args = Array.prototype.slice.apply(arguments)
+  const dir = args.shift()
+
+  // Keep webpack inline loader intact
+  if (args[0].includes('!')) {
+    const loaders = args.shift().split('!')
+
+    return loaders.concat(relativeTo(dir, loaders.pop(), ...args)).join('!')
+  }
+
+  // Resolve path
+  const _path = r(...args)
+
+  // Check if path is an alias
+  if (startsWithSrcAlias(_path)) {
+    return _path
+  }
+
+  // Make correct relative path
+  let rp = path.relative(dir, _path)
+  if (rp[0] !== '.') {
+    rp = './' + rp
+  }
+
+  return wp(rp)
+}
+
+export function defineAlias(src, target, prop, opts = {}) {
+  const { bind = true, warn = false } = opts
+
+  if (Array.isArray(prop)) {
+    for (const p of prop) {
+      defineAlias(src, target, p, opts)
+    }
+    return
+  }
+
+  let targetVal = target[prop]
+  if (bind && typeof targetVal === 'function') {
+    targetVal = targetVal.bind(target)
+  }
+
+  let warned = false
+
+  Object.defineProperty(src, prop, {
+    get: () => {
+      if (warn && !warned) {
+        warned = true
+        consola.warn({
+          message: `'${prop}' is deprecated'`,
+          additional: new Error().stack.split('\n').splice(2).join('\n')
+        })
+      }
+      return targetVal
+    }
+  })
+}

packages/utils/src/route.js

@@ -1,193 +1,8 @@
 import path from 'path'
-import escapeRegExp from 'lodash/escapeRegExp'
 import get from 'lodash/get'
 import consola from 'consola'
-import serialize from 'serialize-javascript'
 
-export const encodeHtml = function encodeHtml(str) {
+import { r } from './resolve'
-  return str.replace(/</g, '&lt;').replace(/>/g, '&gt;')
-}
-
-export const getContext = function getContext(req, res) {
-  return { req, res }
-}
-
-export const waitFor = function waitFor(ms) {
-  return new Promise(resolve => setTimeout(resolve, ms || 0))
-}
-
-export const isString = obj => typeof obj === 'string' || obj instanceof String
-
-export const isNonEmptyString = obj => obj && isString(obj)
-
-export const startsWithAlias = aliasArray => str => aliasArray.some(c => str.startsWith(c))
-
-export const startsWithSrcAlias = startsWithAlias(['@', '~'])
-
-export const startsWithRootAlias = startsWithAlias(['@@', '~~'])
-
-async function promiseFinally(fn, finalFn) {
-  let result
-  try {
-    if (typeof fn === 'function') {
-      result = await fn()
-    } else {
-      result = await fn
-    }
-  } finally {
-    finalFn()
-  }
-  return result
-}
-
-export const timeout = function timeout(fn, ms, msg) {
-  let timerId
-  const warpPromise = promiseFinally(fn, () => clearTimeout(timerId))
-  const timerPromise = new Promise((resolve, reject) => {
-    timerId = setTimeout(() => reject(new Error(msg)), ms)
-  })
-  return Promise.race([warpPromise, timerPromise])
-}
-
-export const urlJoin = function urlJoin() {
-  return [].slice
-    .call(arguments)
-    .join('/')
-    .replace(/\/+/g, '/')
-    .replace(':/', '://')
-}
-
-export const isUrl = function isUrl(url) {
-  return ['http', '//'].some(str => url.startsWith(str))
-}
-
-export const promisifyRoute = function promisifyRoute(fn, ...args) {
-  // If routes is an array
-  if (Array.isArray(fn)) {
-    return Promise.resolve(fn)
-  }
-  // If routes is a function expecting a callback
-  if (fn.length === arguments.length) {
-    return new Promise((resolve, reject) => {
-      fn((err, routeParams) => {
-        if (err) {
-          reject(err)
-        }
-        resolve(routeParams)
-      }, ...args)
-    })
-  }
-  let promise = fn(...args)
-  if (
-    !promise ||
-    (!(promise instanceof Promise) && typeof promise.then !== 'function')
-  ) {
-    promise = Promise.resolve(promise)
-  }
-  return promise
-}
-
-export const sequence = function sequence(tasks, fn) {
-  return tasks.reduce(
-    (promise, task) => promise.then(() => fn(task)),
-    Promise.resolve()
-  )
-}
-
-export const parallel = function parallel(tasks, fn) {
-  return Promise.all(tasks.map(fn))
-}
-
-export const chainFn = function chainFn(base, fn) {
-  /* istanbul ignore if */
-  if (typeof fn !== 'function') {
-    return base
-  }
-  return function () {
-    if (typeof base !== 'function') {
-      return fn.apply(this, arguments)
-    }
-    let baseResult = base.apply(this, arguments)
-    // Allow function to mutate the first argument instead of returning the result
-    if (baseResult === undefined) {
-      baseResult = arguments[0]
-    }
-    const fnResult = fn.call(
-      this,
-      baseResult,
-      ...Array.prototype.slice.call(arguments, 1)
-    )
-    // Return mutated argument if no result was returned
-    if (fnResult === undefined) {
-      return baseResult
-    }
-    return fnResult
-  }
-}
-
-export const isPureObject = function isPureObject(o) {
-  return !Array.isArray(o) && typeof o === 'object'
-}
-
-export const isWindows = /^win/.test(process.platform)
-
-export const wp = function wp(p = '') {
-  /* istanbul ignore if */
-  if (isWindows) {
-    return p.replace(/\\/g, '\\\\')
-  }
-  return p
-}
-
-export const wChunk = function wChunk(p = '') {
-  /* istanbul ignore if */
-  if (isWindows) {
-    return p.replace(/\//g, '_')
-  }
-  return p
-}
-
-const reqSep = /\//g
-const sysSep = escapeRegExp(path.sep)
-const normalize = string => string.replace(reqSep, sysSep)
-
-export const r = function r(...args) {
-  const lastArg = args[args.length - 1]
-
-  if (startsWithSrcAlias(lastArg)) {
-    return wp(lastArg)
-  }
-
-  return wp(path.resolve(...args.map(normalize)))
-}
-
-export const relativeTo = function relativeTo() {
-  const args = Array.prototype.slice.apply(arguments)
-  const dir = args.shift()
-
-  // Keep webpack inline loader intact
-  if (args[0].includes('!')) {
-    const loaders = args.shift().split('!')
-
-    return loaders.concat(relativeTo(dir, loaders.pop(), ...args)).join('!')
-  }
-
-  // Resolve path
-  const _path = r(...args)
-
-  // Check if path is an alias
-  if (startsWithSrcAlias(_path)) {
-    return _path
-  }
-
-  // Make correct relative path
-  let rp = path.relative(dir, _path)
-  if (rp[0] !== '.') {
-    rp = './' + rp
-  }
-
-  return wp(rp)
-}
 
 export const flatRoutes = function flatRoutes(router, _path = '', routes = []) {
   router.forEach((r) => {
@@ -383,18 +198,6 @@ export const guardDir = function guardDir(options, key1, key2) {
   }
 }
 
-export const determineGlobals = function determineGlobals(globalName, globals) {
-  const _globals = {}
-  for (const global in globals) {
-    if (typeof globals[global] === 'function') {
-      _globals[global] = globals[global](globalName)
-    } else {
-      _globals[global] = globals[global]
-    }
-  }
-  return _globals
-}
-
 const getRoutePathExtension = (key) => {
   if (key === '_') {
     return '*'
@@ -407,76 +210,28 @@ const getRoutePathExtension = (key) => {
   return key
 }
 
-/**
+export const promisifyRoute = function promisifyRoute(fn, ...args) {
- * Wraps value in array if it is not already an array
+  // If routes is an array
- *
+  if (Array.isArray(fn)) {
- * @param  {any} value
+    return Promise.resolve(fn)
- * @return {array}
+  }
- */
+  // If routes is a function expecting a callback
-export const wrapArray = value => Array.isArray(value) ? value : [value]
+  if (fn.length === arguments.length) {
-
+    return new Promise((resolve, reject) => {
-const WHITESPACE_REPLACEMENTS = [
+      fn((err, routeParams) => {
-  [/[ \t\f\r]+\n/g, '\n'], // strip empty indents
+        if (err) {
-  [/{\n{2,}/g, '{\n'], // strip start padding from blocks
+          reject(err)
-  [/\n{2,}([ \t\f\r]*})/g, '\n$1'], // strip end padding from blocks
+        }
-  [/\n{3,}/g, '\n\n'], // strip multiple blank lines (1 allowed)
+        resolve(routeParams)
-  [/\n{2,}$/g, '\n'] // strip blank lines EOF (0 allowed)
+      }, ...args)
-]
-
-export const stripWhitespace = function stripWhitespace(string) {
-  WHITESPACE_REPLACEMENTS.forEach(([regex, newSubstr]) => {
-    string = string.replace(regex, newSubstr)
     })
-  return string
+  }
+  let promise = fn(...args)
+  if (
+    !promise ||
+    (!(promise instanceof Promise) && typeof promise.then !== 'function')
+  ) {
+    promise = Promise.resolve(promise)
+  }
+  return promise
 }
-
-export function defineAlias(src, target, prop, opts = {}) {
-  const { bind = true, warn = false } = opts
-
-  if (Array.isArray(prop)) {
-    for (const p of prop) {
-      defineAlias(src, target, p, opts)
-    }
-    return
-  }
-
-  let targetVal = target[prop]
-  if (bind && typeof targetVal === 'function') {
-    targetVal = targetVal.bind(target)
-  }
-
-  let warned = false
-
-  Object.defineProperty(src, prop, {
-    get: () => {
-      if (warn && !warned) {
-        warned = true
-        consola.warn({
-          message: `'${prop}' is deprecated'`,
-          additional: new Error().stack.split('\n').splice(2).join('\n')
-        })
-      }
-      return targetVal
-    }
-  })
-}
-
-export function serializeFunction(func) {
-  let open = false
-  return serialize(func)
-    .replace(serializeFunction.assignmentRE, (_, spaces) => {
-      return `${spaces}:function(`
-    })
-    .replace(serializeFunction.internalFunctionRE, (_, spaces, name, args) => {
-      if (open) {
-        return `${spaces}${name}:function(${args}) {`
-      } else {
-        open = true
-        return _
-      }
-    })
-    .replace(`${func.name}(`, 'function(')
-}
-
-serializeFunction.internalFunctionRE = /^(\s*)(?!(?:if)|(?:for)|(?:while)|(?:switch))(\w+)\s*\((.*?)\)\s*\{/gm
-serializeFunction.assignmentRE = /^(\s*):(\w+)\(/gm

packages/utils/src/serialize.js

@@ -0,0 +1,22 @@
+
+import serialize from 'serialize-javascript'
+
+export function serializeFunction(func) {
+  let open = false
+  return serialize(func)
+    .replace(serializeFunction.assignmentRE, (_, spaces) => {
+      return `${spaces}:function(`
+    })
+    .replace(serializeFunction.internalFunctionRE, (_, spaces, name, args) => {
+      if (open) {
+        return `${spaces}${name}:function(${args}) {`
+      } else {
+        open = true
+        return _
+      }
+    })
+    .replace(`${func.name}(`, 'function(')
+}
+
+serializeFunction.internalFunctionRE = /^(\s*)(?!(?:if)|(?:for)|(?:while)|(?:switch))(\w+)\s*\((.*?)\)\s*\{/gm
+serializeFunction.assignmentRE = /^(\s*):(\w+)\(/gm

packages/utils/src/task.js

@@ -0,0 +1,37 @@
+export const sequence = function sequence(tasks, fn) {
+  return tasks.reduce(
+    (promise, task) => promise.then(() => fn(task)),
+    Promise.resolve()
+  )
+}
+
+export const parallel = function parallel(tasks, fn) {
+  return Promise.all(tasks.map(fn))
+}
+
+export const chainFn = function chainFn(base, fn) {
+  /* istanbul ignore if */
+  if (typeof fn !== 'function') {
+    return base
+  }
+  return function () {
+    if (typeof base !== 'function') {
+      return fn.apply(this, arguments)
+    }
+    let baseResult = base.apply(this, arguments)
+    // Allow function to mutate the first argument instead of returning the result
+    if (baseResult === undefined) {
+      baseResult = arguments[0]
+    }
+    const fnResult = fn.call(
+      this,
+      baseResult,
+      ...Array.prototype.slice.call(arguments, 1)
+    )
+    // Return mutated argument if no result was returned
+    if (fnResult === undefined) {
+      return baseResult
+    }
+    return fnResult
+  }
+}

packages/utils/src/timer.js

@@ -0,0 +1,26 @@
+async function promiseFinally(fn, finalFn) {
+  let result
+  try {
+    if (typeof fn === 'function') {
+      result = await fn()
+    } else {
+      result = await fn
+    }
+  } finally {
+    finalFn()
+  }
+  return result
+}
+
+export const timeout = function timeout(fn, ms, msg) {
+  let timerId
+  const warpPromise = promiseFinally(fn, () => clearTimeout(timerId))
+  const timerPromise = new Promise((resolve, reject) => {
+    timerId = setTimeout(() => reject(new Error(msg)), ms)
+  })
+  return Promise.race([warpPromise, timerPromise])
+}
+
+export const waitFor = function waitFor(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms || 0))
+}

packages/vue-renderer/package.json

@@ -8,8 +8,8 @@
   ],
   "main": "dist/vue-renderer.js",
   "dependencies": {
-    "@nuxt/common": "2.3.4",
     "@nuxt/devalue": "^1.2.0",
+    "@nuxt/utils": "2.3.4",
     "consola": "^2.3.0",
     "fs-extra": "^7.0.1",
     "lru-cache": "^5.1.1",

packages/vue-renderer/src/renderer.js

@@ -5,7 +5,7 @@ import consola from 'consola'
 import devalue from '@nuxt/devalue'
 import invert from 'lodash/invert'
 import template from 'lodash/template'
-import { waitFor } from '@nuxt/common'
+import { waitFor } from '@nuxt/utils'
 import { createBundleRenderer } from 'vue-server-renderer'
 
 import SPAMetaRenderer from './spa-meta'

packages/webpack/package.json

@@ -11,8 +11,8 @@
     "@babel/core": "^7.2.2",
     "@babel/polyfill": "^7.2.3",
     "@nuxt/babel-preset-app": "2.3.4",
-    "@nuxt/common": "2.3.4",
     "@nuxt/friendly-errors-webpack-plugin": "^2.4.0",
+    "@nuxt/utils": "2.3.4",
     "babel-loader": "^8.0.4",
     "cache-loader": "^1.2.5",
     "caniuse-lite": "^1.0.30000923",

packages/webpack/src/builder.js

@@ -11,7 +11,7 @@ import {
   parallel,
   sequence,
   wrapArray
-} from '@nuxt/common'
+} from '@nuxt/utils'
 
 import { ClientConfig, ModernConfig, ServerConfig } from './config'
 import PerfLoader from './utils/perf-loader'

packages/webpack/src/config/base.js

@@ -11,7 +11,7 @@ import TerserWebpackPlugin from 'terser-webpack-plugin'
 import WebpackBar from 'webpackbar'
 import env from 'std-env'
 
-import { isUrl, urlJoin } from '@nuxt/common'
+import { isUrl, urlJoin } from '@nuxt/utils'
 
 import PerfLoader from '../utils/perf-loader'
 import StyleLoader from '../utils/style-loader'

packages/webpack/src/utils/postcss.js

@@ -5,7 +5,7 @@ import merge from 'lodash/merge'
 import cloneDeep from 'lodash/cloneDeep'
 import createResolver from 'postcss-import-resolver'
 
-import { isPureObject } from '@nuxt/common'
+import { isPureObject } from '@nuxt/utils'
 
 export const orderPresets = {
   cssnanoLast: (names) => {

packages/webpack/src/utils/style-loader.js

@@ -1,7 +1,7 @@
 import path from 'path'
 import ExtractCssChunksPlugin from 'extract-css-chunks-webpack-plugin'
 
-import { wrapArray } from '@nuxt/common'
+import { wrapArray } from '@nuxt/utils'
 
 import PostcssConfig from './postcss'
 

test/unit/utils.test.js

@@ -1,6 +1,6 @@
 import path from 'path'
 import { waitUntil } from '../utils'
-import * as Utils from '../../packages/common/src/index'
+import * as Utils from '../../packages/utils/src/index'
 
 describe('utils', () => {
   test('encodeHtml', () => {

test/utils/index.js

@@ -1,5 +1,5 @@
 import klawSync from 'klaw-sync'
-import { waitFor } from '../../packages/common'
+import { waitFor } from '../../packages/utils'
 
 export { getNuxtConfig } from '../../packages/config'
 export { default as getPort } from 'get-port'

test/utils/nuxt.js

@@ -8,7 +8,7 @@ export { Nuxt } from '../../packages/core/src/index'
 export { Builder } from '../../packages/builder/src/index'
 export { Generator } from '../../packages/generator/src/index'
 export { BundleBuilder } from '../../packages/webpack/src/index'
-export * from '../../packages/common/src/index'
+export * from '../../packages/utils/src/index'
 
 export const loadFixture = async function (fixture, overrides) {
   const rootDir = path.resolve(__dirname, '..', 'fixtures', fixture)