// @remove-on-eject-begin
/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
// @remove-on-eject-end
var path = require('path');
var autoprefixer = require('autoprefixer');
var webpack = require('webpack');
var HtmlWebpackPlugin = require('html-webpack-plugin');
var CaseSensitivePathsPlugin = require('case-sensitive-paths-webpack-plugin');
var WatchMissingNodeModulesPlugin = require('../scripts/utils/WatchMissingNodeModulesPlugin');
var paths = require('./paths');
var env = require('./env');
// This is the development configuration.
// It is focused on developer experience and fast rebuilds.
// The production configuration is different and lives in a separate file.
module.exports = {
// This makes the bundle appear split into separate modules in the devtools.
// We don't use source maps here because they can be confusing:
// https://github.com/facebookincubator/create-react-app/issues/343#issuecomment-237241875
// You may want 'cheap-module-source-map' instead if you prefer source maps.
devtool: 'eval',
// These are the "entry points" to our application.
// This means they will be the "root" imports that are included in JS bundle.
// The first two entry points enable "hot" CSS and auto-refreshes for JS.
entry: [
// Include WebpackDevServer client. It connects to WebpackDevServer via
// sockets and waits for recompile notifications. When WebpackDevServer
// recompiles, it sends a message to the client by socket. If only CSS
// was changed, the app reload just the CSS. Otherwise, it will refresh.
// The "?/" bit at the end tells the client to look for the socket at
// the root path, i.e. /sockjs-node/. Otherwise visiting a client-side
// route like /todos/42 would make it wrongly request /todos/42/sockjs-node.
// The socket server is a part of WebpackDevServer which we are using.
// The /sockjs-node/ path I'm referring to is hardcoded in WebpackDevServer.
require.resolve('webpack-dev-server/client') + '?/',
// Include Webpack hot module replacement runtime. Webpack is pretty
// low-level so we need to put all the pieces together. The runtime listens
// to the events received by the client above, and applies updates (such as
// new CSS) to the running application.
require.resolve('webpack/hot/dev-server'),
// We ship a few polyfills by default.
require.resolve('./polyfills'),
// Finally, this is your app's code:
path.join(paths.appSrc, 'index')
// We include the app code last so that if there is a runtime error during
// initialization, it doesn't blow up the WebpackDevServer client, and
// changing JS code would still trigger a refresh.
],
output: {
// Next line is not used in dev but WebpackDevServer crashes without it:
path: paths.appBuild,
// Add /* filename */ comments to generated require()s in the output.
pathinfo: true,
// This does not produce a real file. It's just the virtual path that is
// served by WebpackDevServer in development. This is the JS bundle
// containing code from all our entry points, and the Webpack runtime.
filename: 'static/js/bundle.js',
// In development, we always serve from the root. This makes config easier.
publicPath: '/'
},
resolve: {
// This allows you to set a fallback for where Webpack should look for modules.
// We read `NODE_PATH` environment variable in `paths.js` and pass paths here.
// We use `fallback` instead of `root` because we want `node_modules` to "win"
// if there any conflicts. This matches Node resolution mechanism.
// https://github.com/facebookincubator/create-react-app/issues/253
fallback: paths.nodePaths,
// These are the reasonable defaults supported by the Node ecosystem.
extensions: ['.js', '.json', ''],
alias: {
// Support React Native Web
// https://www.smashingmagazine.com/2016/08/a-glimpse-into-the-future-with-react-native-for-web/
'react-native': 'react-native-web'
}
},
// Resolve loaders (webpack plugins for CSS, images, transpilation) from the
// directory of `react-scripts` itself rather than the project directory.
// You can remove this after ejecting.
resolveLoader: {
root: paths.ownNodeModules,
moduleTemplates: ['*-loader']
},
module: {
// First, run the linter.
// It's important to do this before Babel processes the JS.
preLoaders: [
{
test: /\.js$/,
loader: 'eslint',
include: paths.appSrc,
}
],
loaders: [
// Process JS with Babel.
{
test: /\.js$/,
include: paths.appSrc,
loader: 'babel',
query: require('./babel.dev')
},
// "postcss" loader applies autoprefixer to our CSS.
// "css" loader resolves paths in CSS and adds assets as dependencies.
// "style" loader turns CSS into JS modules that inject <style> tags.
// In production, we use a plugin to extract that CSS to a file, but
// in development "style" loader enables hot editing of CSS.
{
test: /\.css$/,
loader: 'style!css!postcss'
},
// JSON is not enabled by default in Webpack but both Node and Browserify
// allow it implicitly so we also enable it.
{
test: /\.json$/,
loader: 'json'
},
// "file" loader makes sure those assets get served by WebpackDevServer.
// When you `import` an asset, you get its (virtual) filename.
// In production, they would get copied to the `build` folder.
{
test: /\.(ico|jpg|png|gif|eot|otf|webp|svg|ttf|woff|woff2)(\?.*)?$/,
exclude: /\/favicon.ico$/,
loader: 'file',
query: {
name: 'static/media/[name].[hash:8].[ext]'
}
},
// A special case for favicon.ico to place it into build root directory.
{
test: /\/favicon.ico$/,
include: [paths.appSrc],
loader: 'file',
query: {
name: 'favicon.ico?[hash:8]'
}
},
// "url" loader works just like "file" loader but it also embeds
// assets smaller than specified size as data URLs to avoid requests.
{
test: /\.(mp4|webm)(\?.*)?$/,
loader: 'url',
query: {
limit: 10000,
name: 'static/media/[name].[hash:8].[ext]'
}
},
// "html" loader is used to process template page (index.html) to resolve
// resources linked with <link href="./relative/path"> HTML tags.
{
test: /\.html$/,
loader: 'html',
query: {
attrs: ['link:href'],
}
}
]
},
// Point ESLint to our predefined config.
eslint: {
configFile: path.join(__dirname, 'eslint.js'),
useEslintrc: false
},
// We use PostCSS for autoprefixing only.
postcss: function() {
return [
autoprefixer({
browsers: [
'>1%',
'last 4 versions',
'Firefox ESR',
'not ie < 9', // React doesn't support IE8 anyway
]
}),
];
},
plugins: [
// Generates an `index.html` file with the <script> injected.
new HtmlWebpackPlugin({
inject: true,
template: paths.appHtml,
}),
// Makes some environment variables available to the JS code, for example:
// if (process.env.NODE_ENV === 'development') { ... }. See `env.js`.
new webpack.DefinePlugin(env),
// This is necessary to emit hot updates (currently CSS only):
new webpack.HotModuleReplacementPlugin(),
// Watcher doesn't work well if you mistype casing in a path so we use
// a plugin that prints an error when you attempt to do this.
// See https://github.com/facebookincubator/create-react-app/issues/240
new CaseSensitivePathsPlugin(),
// If you require a missing module and then `npm install` it, you still have
// to restart the development server for Webpack to discover it. This plugin
// makes the discovery automatic so you don't have to restart.
// See https://github.com/facebookincubator/create-react-app/issues/186
new WatchMissingNodeModulesPlugin(paths.appNodeModules)
]
};