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index.js
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// @flow
const path = require('path')
const autoprefixer = require('autoprefixer')
const CopyWebpackPlugin = require('copy-webpack-plugin')
const flexbugs = require('postcss-flexbugs-fixes')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const TerserPlugin = require(`terser-webpack-plugin`)
const MiniCssExtractPlugin = require('mini-css-extract-plugin')
const OptimizeCssAssetsPlugin = require(`optimize-css-assets-webpack-plugin`)
const { UnusedFilesWebpackPlugin } = require('unused-files-webpack-plugin')
const FaviconsWebpackPlugin = require('favicons-webpack-plugin')
const webpack = require('webpack')
const { loadConfig } = require('browserslist')
const builtinPlugins = require('./plugins')
const statsConfig = require('./stats')
export type Env = 'production' | 'test' | 'development'
export type LoaderSpec = string | { loader: string, options?: Object }
export type LoaderResolver<T: Object> = (options?: T) => LoaderSpec
type Condition = string | RegExp | RegExp[]
export type Rule = {
test?: Condition,
use: LoaderSpec[],
exclude?: Condition,
include?: Condition,
}
export type RuleFactory<T: Object> = (options?: T) => Rule
export type ContextualRuleFactory = RuleFactory<*> & {
internal: RuleFactory<*>,
external: RuleFactory<*>,
}
type PluginInstance = any
type PluginFactory = (...args?: any) => PluginInstance
type BuiltinPlugins = typeof builtinPlugins
export type StatKeys = $Keys<typeof statsConfig> // eslint-disable-line
export type StatsConfig = {| [key: StatKeys]: boolean |}
type StatAtoms = {|
none: StatsConfig,
minimal: StatsConfig,
|}
export type WebpackAtomsOptions = {
babelConfig?: Object,
browsers?: string[],
vendorRegex?: RegExp,
env: ?Env,
assetRelativeRoot?: string,
useMiniExtract: boolean,
}
export type LoaderAtoms = {
json: LoaderResolver<*>,
yaml: LoaderResolver<*>,
null: LoaderResolver<*>,
raw: LoaderResolver<*>,
style: LoaderResolver<*>,
css: LoaderResolver<*>,
cssLiteral: LoaderResolver<*>,
astroturf: LoaderResolver<*>,
postcss: LoaderResolver<{
browsers?: string[],
plugins?: Array<any> | ((loader: any) => Array<any>),
}>,
less: LoaderResolver<*>,
sass: LoaderResolver<*>,
fastSass: LoaderResolver<*>,
file: LoaderResolver<*>,
url: LoaderResolver<*>,
js: LoaderResolver<*>,
imports: LoaderResolver<*>,
exports: LoaderResolver<*>,
}
type JsRule = RuleFactory<*> & {
inlineCss: RuleFactory<*>,
}
export type RuleAtoms = {
js: JsRule,
yaml: RuleFactory<*>,
fonts: RuleFactory<*>,
images: RuleFactory<*>,
audioVideo: RuleFactory<*>,
files: RuleFactory<*>,
css: ContextualRuleFactory,
postcss: ContextualRuleFactory,
less: ContextualRuleFactory,
sass: ContextualRuleFactory,
fastSass: ContextualRuleFactory,
astroturf: ContextualRuleFactory,
}
export type PluginAtoms = BuiltinPlugins & {
define: PluginFactory,
extractText: PluginFactory,
html: PluginFactory,
loaderOptions: PluginFactory,
moment: PluginFactory,
minifyJs: PluginFactory,
minifyCss: PluginFactory,
unusedFiles: PluginFactory,
favicons: PluginFactory,
copy: PluginFactory,
}
export type WebpackAtoms = {
loaders: LoaderAtoms,
rules: RuleAtoms,
plugins: PluginAtoms,
stats: StatAtoms,
}
let VENDOR_MODULE_REGEX = /node_modules/
let DEFAULT_BROWSERS = ['> 1%', 'Firefox ESR', 'not ie < 9']
function createAtoms(options?: WebpackAtomsOptions): WebpackAtoms {
let {
babelConfig = {},
assetRelativeRoot = '',
env = process.env.NODE_ENV,
vendorRegex = VENDOR_MODULE_REGEX,
disableMiniExtractInDev = true,
ignoreBrowserslistConfig = false,
browsers: supportedBrowsers,
} = options || {}
if (ignoreBrowserslistConfig || !loadConfig({ path: path.resolve('.') }))
supportedBrowsers = supportedBrowsers || DEFAULT_BROWSERS
const makeExternalOnly = (original: RuleFactory<*>) => (
options = {}
): Rule => {
let rule = original(options)
rule.include = vendorRegex
return rule
}
const makeInternalOnly = (original: RuleFactory<*>) => (
options = {}
): Rule => {
let rule = original(options)
rule.exclude = vendorRegex
return rule
}
const makeExtractLoaders = ({ extract } = {}, config) => [
loaders.miniCssExtract({
fallback: config.fallback,
disable: extract == undefined ? extract : !extract,
}),
...config.use,
]
const PRODUCTION = env === 'production'
let ident = 0
/**
* Loaders
*/
const loaders: LoaderAtoms = {
json: () => ({
loader: require.resolve('json-loader'),
}),
yaml: () => ({
loader: require.resolve('yaml-loader'),
}),
null: () => ({
loader: require.resolve('null-loader'),
}),
raw: () => ({
loader: require.resolve('raw-loader'),
}),
style: () => ({
loader: require.resolve('style-loader'),
}),
miniCssExtract: ({
disable = !PRODUCTION && disableMiniExtractInDev,
fallback,
...options
}) =>
disable
? fallback || loaders.style()
: {
loader: MiniCssExtractPlugin.loader,
options,
},
css: (options = {}) => ({
loader: require.resolve('css-loader'),
options: {
sourceMap: !PRODUCTION,
camelCase: 'dashes',
// https://github.com/webpack-contrib/css-loader/issues/406
localIdentName: '[name]--[local]--[hash:base64:5]',
...options,
},
}),
cssLiteral: (options = {}) => ({
options,
loader: require.resolve('astroturf/loader'),
}),
astroturf: options => ({
options: { extension: '.module.css', ...options },
loader: require.resolve('astroturf/loader'),
}),
postcss: (options = {}) => {
let { plugins, browsers = supportedBrowsers, ...postcssOpts } = options
return {
loader: require.resolve('postcss-loader'),
options: {
ident: `postcss-${++ident}`,
plugins: loader => {
plugins =
(typeof plugins === `function` ? plugins(loader) : plugins) || []
return [
flexbugs,
autoprefixer({ browsers, flexbox: `no-2009` }),
...plugins,
]
},
...postcssOpts,
},
}
},
less: (options = {}) => ({
options,
loader: require.resolve('less-loader'),
}),
sass: (options = {}) => ({
options,
loader: require.resolve('sass-loader'),
}),
fastSass: (options = {}) => ({
options,
loader: require.resolve('@4c/fast-sass-loader'),
}),
file: (options = {}) => ({
loader: require.resolve('file-loader'),
options: {
name: `${assetRelativeRoot}[name]-[hash].[ext]`,
...options,
},
}),
url: (options = {}) => ({
loader: require.resolve('url-loader'),
options: {
limit: 10000,
name: `${assetRelativeRoot}[name]-[hash].[ext]`,
...options,
},
}),
js: (options = babelConfig) => ({
options,
loader: require.resolve('babel-loader'),
}),
imports: (options = {}) => ({
options,
loader: require.resolve('imports-loader'),
}),
exports: (options = {}) => ({
options,
loader: require.resolve('exports-loader'),
}),
}
/**
* Rules
*/
const rules = {}
/**
* Javascript loader via babel, excludes node_modules
*/
{
let js = (options = {}) => ({
test: /\.jsx?$/,
exclude: vendorRegex,
use: [loaders.js(options)],
})
js.inlineCss = (options = {}) => {
let { tagName, extension, ...rest } = options
let rule = js(rest)
rule.use.push(loaders.cssLiteral({ tagName, extension }))
return rule
}
rules.js = js
}
rules.yaml = () => ({
test: /\.ya?ml/,
use: [loaders.json(), loaders.yaml()],
})
/**
* Font loader
*/
rules.fonts = () => ({
use: [loaders.url()],
test: /\.(eot|otf|ttf|woff(2)?)(\?.*)?$/,
})
/**
* Loads image assets, inlines images via a data URI if they are below
* the size threshold
*/
rules.images = () => ({
use: [loaders.url()],
test: /\.(ico|svg|jpg|jpeg|png|gif|webp)(\?.*)?$/,
})
/**
* Loads audio or video assets
*/
rules.audioVideo = () => ({
use: [loaders.file()],
test: /\.(mp4|webm|wav|mp3|m4a|aac|oga|flac)$/,
})
/**
* A catch-all rule for everything that isn't js, json, or html.
* Should only be used in the context of a webpack `oneOf` rule as a fallback
* (see rules.assets())
*/
rules.files = () => ({
// Exclude `js` files to keep "css" loader working as it injects
// it's runtime that would otherwise processed through "file" loader.
// Also exclude `html` and `json` extensions so they get processed
// by webpacks internal loaders.
exclude: [/\.jsx?$/, /\.html$/, /\.json$/],
use: [loaders.file()],
})
/**
* Astroturf loader.
*/
{
let astroturf = (options = {}) => ({
test: /\.(j|t)sx?$/,
use: [loaders.astroturf(options)],
})
astroturf.sass = opts => astroturf({ extension: '.module.scss', ...opts })
astroturf.less = opts => astroturf({ extension: '.module.less', ...opts })
rules.astroturf = astroturf
}
/**
* CSS style loader.
*/
{
const css = ({ browsers, ...options } = {}) => ({
test: /\.css$/,
use: makeExtractLoaders(options, {
fallback: loaders.style(),
use: [
loaders.css({ ...options, importLoaders: 1 }),
loaders.postcss({ browsers }),
],
}),
})
rules.css = opts => ({
oneOf: [
{ ...css({ ...opts, modules: true }), test: /\.module\.css$/ },
css(opts),
],
})
rules.css.internal = makeInternalOnly(rules.css)
rules.css.external = makeExternalOnly(rules.css)
}
/**
* PostCSS loader.
*/
{
const postcss = ({ modules, ...opts } = {}) => ({
test: /\.css$/,
use: makeExtractLoaders(opts, {
fallback: loaders.style,
use: [
loaders.css({ importLoaders: 1, modules }),
loaders.postcss(opts),
],
}),
})
rules.postcss = opts => ({
oneOf: [
{ ...postcss({ ...options, modules: true }), test: /\.module\.css$/ },
postcss(opts),
],
})
rules.postcss.internal = makeInternalOnly(rules.postcss)
rules.postcss.external = makeExternalOnly(rules.postcss)
}
/**
* Less style loader.
*/
{
const less = ({ modules, browsers, ...options } = {}) => ({
test: /\.less$/,
use: makeExtractLoaders(options, {
fallback: loaders.style(),
use: [
loaders.css({ importLoaders: 2, modules }),
loaders.postcss({ browsers }),
loaders.less(options),
],
}),
})
rules.less = opts => ({
oneOf: [
{ ...less({ ...options, modules: true }), test: /\.module\.less$/ },
less(opts),
],
})
rules.less.internal = makeInternalOnly(rules.less)
rules.less.external = makeExternalOnly(rules.less)
}
/**
* SASS style loader, excludes node_modules.
*/
{
const sass = ({ browsers, modules, ...options } = {}) => ({
test: /\.s(a|c)ss$/,
use: makeExtractLoaders(options, {
fallback: loaders.style(),
use: [
loaders.css({ importLoaders: 2, modules }),
loaders.postcss({ browsers }),
loaders.sass(options),
],
}),
})
rules.sass = opts => ({
oneOf: [
{ ...sass({ ...options, modules: true }), test: /\.module\.s(a|c)ss$/ },
sass(opts),
],
})
rules.sass.internal = makeInternalOnly(rules.sass)
rules.sass.external = makeExternalOnly(rules.sass)
}
/**
* fast SASS style loader, excludes node_modules.
*/
{
const fastSass = ({ browsers, modules, ...options } = {}) => ({
test: /\.s(a|c)ss$/,
use: makeExtractLoaders(options, {
fallback: loaders.style(),
use: [
loaders.css({ importLoaders: 2, modules }),
loaders.postcss({ browsers }),
loaders.fastSass(options),
],
}),
})
rules.fastSass = opts => ({
oneOf: [
{
...fastSass({ ...options, modules: true }),
test: /\.module\.s(a|c)ss$/,
},
fastSass(opts),
],
})
rules.fastSass.internal = makeInternalOnly(rules.fastSass)
rules.fastSass.external = makeExternalOnly(rules.fastSass)
}
/**
* Plugins
*/
const plugins = { ...builtinPlugins }
/**
* https://webpack.js.org/plugins/define-plugin/
*
* Replace tokens in code with static values. Defaults to setting NODE_ENV
* which is used by React and other libraries to toggle development mode.
*/
plugins.define = (defines = {}) =>
new webpack.DefinePlugin({
'process.env.NODE_ENV': JSON.stringify(env),
...defines,
})
/**
* The webpack2 shim plugin for passing options to loaders. Sets
* the minize and debug options to `true` in production (used by various loaders)
*/
plugins.loaderOptions = (options = {}) =>
new webpack.LoaderOptionsPlugin({
options,
minimize: PRODUCTION,
debug: !PRODUCTION,
})
/**
* Minify javascript code without regard for IE8. Attempts
* to parallelize the work to save time. Generally only add in Production
*/
/**
* Minify javascript code without regard for IE8. Attempts
* to parallelize the work to save time. Generally only add in Production
*/
plugins.minifyJs = ({ terserOptions, ...options } = {}) =>
new TerserPlugin({
cache: true,
parallel: true,
exclude: /\.min\.js/,
sourceMap: true,
terserOptions: {
ecma: 8,
ie8: false,
...terserOptions,
},
...options,
})
/**
* Extracts css requires into a single file;
* includes some reasonable defaults
*/
plugins.extractCss = options =>
new MiniCssExtractPlugin({
filename: '[name]-[contenthash].css',
...options,
})
plugins.minifyCss = (options = {}) => new OptimizeCssAssetsPlugin(options)
/**
* Generates an html file that includes the output bundles.
* Sepecify a `title` option to set the page title.
*/
plugins.html = opts =>
new HtmlWebpackPlugin({
inject: true,
template: path.join(__dirname, '../assets/index.html'),
...opts,
})
plugins.moment = () => new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/)
plugins.copy = (...args) => new CopyWebpackPlugin(...args)
plugins.unusedFiles = (...args) => new UnusedFilesWebpackPlugin(...args)
plugins.favicons = (...args) => new FaviconsWebpackPlugin(...args)
const stats: StatAtoms = {
none: statsConfig,
minimal: {
...statsConfig,
errors: true,
errorDetails: true,
assets: true,
chunks: true,
colors: true,
performance: true,
timings: true,
warnings: true,
},
}
return {
loaders,
rules: (rules: RuleAtoms),
plugins: (plugins: PluginAtoms),
stats,
makeExternalOnly,
makeInternalOnly,
makeExtractLoaders,
}
}
module.exports = {
...createAtoms(),
createAtoms,
}