migrate require to ES6 imports

lib/builder/builder.js

@@ -11,10 +11,12 @@ import MFS from 'memory-fs'
 import webpackDevMiddleware from 'webpack-dev-middleware'
 import webpackHotMiddleware from 'webpack-hot-middleware'
 import { r, wp, createRoutes, parallel } from 'utils'
+import Debug from 'debug'
+import Glob from 'glob'
 import clientWebpackConfig from './webpack/client.config.js'
 import serverWebpackConfig from './webpack/server.config.js'
 
-const debug = require('debug')('nuxt:build')
+const debug = Debug('nuxt:build')
 debug.color = 2 // Force green color
 
 const remove = pify(fs.remove)
@@ -22,7 +24,7 @@ const readFile = pify(fs.readFile)
 const utimes = pify(fs.utimes)
 const writeFile = pify(fs.writeFile)
 const mkdirp = pify(fs.mkdirp)
-const glob = pify(require('glob'))
+const glob = pify(Glob)
 
 export default class Builder extends Tapable {
   constructor (nuxt) {

lib/builder/generator.js

@@ -5,8 +5,9 @@ import { resolve, join, dirname, sep } from 'path'
 import { minify } from 'html-minifier'
 import Tapable from 'tappable'
 import { isUrl, promisifyRoute, waitFor, flatRoutes } from 'utils'
+import Debug from 'debug'
 
-const debug = require('debug')('nuxt:generate')
+const debug = Debug('nuxt:generate')
 const copy = pify(fs.copy)
 const remove = pify(fs.remove)
 const writeFile = pify(fs.writeFile)

lib/builder/webpack/base.config.js

@@ -3,6 +3,7 @@ import { defaults, cloneDeep } from 'lodash'
 import { join, resolve } from 'path'
 import webpack from 'webpack'
 import { isUrl, urlJoin } from 'utils'
+import autoprefixer from 'autoprefixer'
 import vueLoaderConfig from './vue-loader.config'
 import { styleLoader, extractStyles } from './helpers'
 
@@ -19,7 +20,7 @@ export default function webpackBaseConfig ({ isClient, isServer }) {
 
   if (!Array.isArray(this.options.build.postcss)) {
     this.options.build.postcss = [
-      require('autoprefixer')({
+      autoprefixer({
         browsers: ['last 3 versions']
       })
     ]

lib/core/module.js

@@ -4,8 +4,9 @@ import { uniq } from 'lodash'
 import hash from 'hash-sum'
 import Tapable from 'tappable'
 import { chainFn, sequence } from 'utils'
+import Debug from 'debug'
 
-const debug = require('debug')('nuxt:module')
+const debug = Debug('nuxt:module')
 
 export default class ModuleContainer extends Tapable {
   constructor (nuxt) {

lib/core/renderer.js

@@ -11,9 +11,11 @@ import { resolve, join } from 'path'
 import fs from 'fs-extra'
 import { createBundleRenderer } from 'vue-server-renderer'
 import { getContext, setAnsiColors, encodeHtml } from 'utils'
+import Debug from 'debug'
 
-const debug = require('debug')('nuxt:render')
+const debug = Debug('nuxt:render')
 debug.color = 4 // Force blue color
+
 setAnsiColors(ansiHTML)
 
 let jsdom = null

lib/core/server.js

@@ -1,6 +1,6 @@
-const http = require('http')
-const connect = require('connect')
-const path = require('path')
+import http from 'http'
+import connect from 'connect'
+import path from 'path'
 
 class Server {
   constructor (nuxt) {