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next.js/server/build/webpack.js
Arunoda Susiripala 304225d9ea Optimize the bundle size of Next.js core (#2422)
* Try to the slim the webpack output.

* Remove react-hot-loader completely from production.
2017-07-01 12:54:16 +05:30

321 lines
10 KiB
JavaScript

import { resolve, join } from 'path'
import { createHash } from 'crypto'
import webpack from 'webpack'
import glob from 'glob-promise'
import WriteFilePlugin from 'write-file-webpack-plugin'
import FriendlyErrorsWebpackPlugin from 'friendly-errors-webpack-plugin'
import CaseSensitivePathPlugin from 'case-sensitive-paths-webpack-plugin'
import UglifyJsPlugin from 'uglifyjs-webpack-plugin'
import UnlinkFilePlugin from './plugins/unlink-file-plugin'
import PagesPlugin from './plugins/pages-plugin'
import DynamicChunksPlugin from './plugins/dynamic-chunks-plugin'
import CombineAssetsPlugin from './plugins/combine-assets-plugin'
import getConfig from '../config'
import * as babelCore from 'babel-core'
import findBabelConfig from './babel/find-config'
import rootModuleRelativePath from './root-module-relative-path'
const documentPage = join('pages', '_document.js')
const defaultPages = [
'_error.js',
'_document.js'
]
const nextPagesDir = join(__dirname, '..', '..', 'pages')
const nextNodeModulesDir = join(__dirname, '..', '..', '..', 'node_modules')
const interpolateNames = new Map(defaultPages.map((p) => {
return [join(nextPagesDir, p), `dist/pages/${p}`]
}))
const relativeResolve = rootModuleRelativePath(require)
export default async function createCompiler (dir, { dev = false, quiet = false, buildDir, conf = null } = {}) {
dir = resolve(dir)
const config = getConfig(dir, conf)
const defaultEntries = dev ? [
join(__dirname, '..', '..', 'client', 'webpack-hot-middleware-client'),
join(__dirname, '..', '..', 'client', 'on-demand-entries-client')
] : []
const mainJS = dev
? require.resolve('../../client/next-dev') : require.resolve('../../client/next')
let totalPages
const entry = async () => {
const entries = {
'main.js': [
...defaultEntries,
mainJS
]
}
const pages = await glob('pages/**/*.js', { cwd: dir })
const devPages = pages.filter((p) => p === 'pages/_document.js' || p === 'pages/_error.js')
// In the dev environment, on-demand-entry-handler will take care of
// managing pages.
if (dev) {
for (const p of devPages) {
entries[join('bundles', p)] = [`./${p}?entry`]
}
} else {
for (const p of pages) {
entries[join('bundles', p)] = [`./${p}?entry`]
}
}
for (const p of defaultPages) {
const entryName = join('bundles', 'pages', p)
if (!entries[entryName]) {
entries[entryName] = [join(nextPagesDir, p) + '?entry']
}
}
totalPages = pages.filter((p) => p !== documentPage).length
return entries
}
const plugins = [
new webpack.IgnorePlugin(/(precomputed)/, /node_modules.+(elliptic)/),
new webpack.LoaderOptionsPlugin({
options: {
context: dir,
customInterpolateName (url, name, opts) {
return interpolateNames.get(this.resourcePath) || url
}
}
}),
new WriteFilePlugin({
exitOnErrors: false,
log: false,
// required not to cache removed files
useHashIndex: false
}),
new webpack.optimize.CommonsChunkPlugin({
name: 'commons',
filename: 'commons.js',
minChunks (module, count) {
// In the dev we use on-demand-entries.
// So, it makes no sense to use commonChunks based on the minChunks count.
// Instead, we move all the code in node_modules into this chunk.
// With that, we could gain better performance for page-rebuild process.
if (dev) {
return module.context && module.context.indexOf('node_modules') >= 0
}
// If there are one or two pages, only move modules to common if they are
// used in all of the pages. Otherwise, move modules used in at-least
// 1/2 of the total pages into commons.
if (totalPages <= 2) {
return count >= totalPages
}
return count >= totalPages * 0.5
}
}),
// This chunk contains all the webpack related code. So, all the changes
// related to that happens to this chunk.
// It won't touch commons.js and that gives us much better re-build perf.
new webpack.optimize.CommonsChunkPlugin({
name: 'manifest',
filename: 'manifest.js'
}),
new webpack.DefinePlugin({
'process.env.NODE_ENV': JSON.stringify(dev ? 'development' : 'production')
}),
new PagesPlugin(),
new DynamicChunksPlugin(),
new CaseSensitivePathPlugin(),
new webpack.optimize.ModuleConcatenationPlugin()
]
if (dev) {
plugins.push(
new webpack.HotModuleReplacementPlugin(),
new webpack.NoEmitOnErrorsPlugin(),
new UnlinkFilePlugin()
)
if (!quiet) {
plugins.push(new FriendlyErrorsWebpackPlugin())
}
} else {
plugins.push(new webpack.IgnorePlugin(/react-hot-loader/))
plugins.push(
new CombineAssetsPlugin({
input: ['manifest.js', 'commons.js', 'main.js'],
output: 'app.js'
}),
new UglifyJsPlugin({
compress: { warnings: false },
sourceMap: false
})
)
}
const nodePathList = (process.env.NODE_PATH || '')
.split(process.platform === 'win32' ? ';' : ':')
.filter((p) => !!p)
const mainBabelOptions = {
cacheDirectory: true,
presets: []
}
const externalBabelConfig = findBabelConfig(dir)
if (externalBabelConfig) {
console.log(`> Using external babel configuration`)
console.log(`> location: "${externalBabelConfig.loc}"`)
// It's possible to turn off babelrc support via babelrc itself.
// In that case, we should add our default preset.
// That's why we need to do this.
const { options } = externalBabelConfig
mainBabelOptions.babelrc = options.babelrc !== false
} else {
mainBabelOptions.babelrc = false
}
// Add our default preset if the no "babelrc" found.
if (!mainBabelOptions.babelrc) {
mainBabelOptions.presets.push(require.resolve('./babel/preset'))
}
const rules = (dev ? [{
test: /\.js(\?[^?]*)?$/,
loader: 'hot-self-accept-loader',
include: [
join(dir, 'pages'),
nextPagesDir
]
}, {
test: /\.js(\?[^?]*)?$/,
loader: 'react-hot-loader/webpack',
exclude: /node_modules/
}] : [])
.concat([{
test: /\.json$/,
loader: 'json-loader'
}, {
test: /\.(js|json)(\?[^?]*)?$/,
loader: 'emit-file-loader',
include: [dir, nextPagesDir],
exclude (str) {
return /node_modules/.test(str) && str.indexOf(nextPagesDir) !== 0
},
options: {
name: 'dist/[path][name].[ext]',
// By default, our babel config does not transpile ES2015 module syntax because
// webpack knows how to handle them. (That's how it can do tree-shaking)
// But Node.js doesn't know how to handle them. So, we have to transpile them here.
transform ({ content, sourceMap, interpolatedName }) {
// Only handle .js files
if (!(/\.js$/.test(interpolatedName))) {
return { content, sourceMap }
}
const transpiled = babelCore.transform(content, {
babelrc: false,
sourceMaps: dev ? 'both' : false,
// Here we need to resolve all modules to the absolute paths.
// Earlier we did it with the babel-preset.
// But since we don't transpile ES2015 in the preset this is not resolving.
// That's why we need to do it here.
// See more: https://github.com/zeit/next.js/issues/951
plugins: [
[require.resolve('babel-plugin-transform-es2015-modules-commonjs')],
[
require.resolve('babel-plugin-module-resolver'),
{
alias: {
'babel-runtime': relativeResolve('babel-runtime/package'),
'next/link': relativeResolve('../../lib/link'),
'next/prefetch': relativeResolve('../../lib/prefetch'),
'next/css': relativeResolve('../../lib/css'),
'next/dynamic': relativeResolve('../../lib/dynamic'),
'next/head': relativeResolve('../../lib/head'),
'next/document': relativeResolve('../../server/document'),
'next/router': relativeResolve('../../lib/router'),
'next/error': relativeResolve('../../lib/error'),
'styled-jsx/style': relativeResolve('styled-jsx/style')
}
}
]
],
inputSourceMap: sourceMap
})
return {
content: transpiled.code,
sourceMap: transpiled.map
}
}
}
}, {
loader: 'babel-loader',
include: nextPagesDir,
exclude (str) {
return /node_modules/.test(str) && str.indexOf(nextPagesDir) !== 0
},
options: {
babelrc: false,
cacheDirectory: true,
presets: [require.resolve('./babel/preset')]
}
}, {
test: /\.js(\?[^?]*)?$/,
loader: 'babel-loader',
include: [dir],
exclude (str) {
return /node_modules/.test(str)
},
options: mainBabelOptions
}])
let webpackConfig = {
context: dir,
entry,
output: {
path: buildDir ? join(buildDir, '.next') : join(dir, config.distDir),
filename: '[name]',
libraryTarget: 'commonjs2',
publicPath: '/_next/webpack/',
strictModuleExceptionHandling: true,
devtoolModuleFilenameTemplate ({ resourcePath }) {
const hash = createHash('sha1')
hash.update(Date.now() + '')
const id = hash.digest('hex').slice(0, 7)
// append hash id for cache busting
return `webpack:///${resourcePath}?${id}`
},
// This saves chunks with the name given via require.ensure()
chunkFilename: '[name]'
},
resolve: {
modules: [
nextNodeModulesDir,
'node_modules',
...nodePathList
]
},
resolveLoader: {
modules: [
nextNodeModulesDir,
'node_modules',
join(__dirname, 'loaders'),
...nodePathList
]
},
plugins,
module: {
rules
},
devtool: dev ? 'cheap-module-inline-source-map' : false,
performance: { hints: false }
}
if (config.webpack) {
console.log(`> Using "webpack" config function defined in ${config.configOrigin}.`)
webpackConfig = await config.webpack(webpackConfig, { dev })
}
return webpack(webpackConfig)
}