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- 'use strict';
- const autoprefixer = require('autoprefixer');
- const path = require('path');
- const webpack = require('webpack');
- const HtmlWebpackPlugin = require('html-webpack-plugin');
- const CaseSensitivePathsPlugin = require('case-sensitive-paths-webpack-plugin');
- const InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin');
- const WatchMissingNodeModulesPlugin = require('react-dev-utils/WatchMissingNodeModulesPlugin');
- const eslintFormatter = require('react-dev-utils/eslintFormatter');
- const ModuleScopePlugin = require('react-dev-utils/ModuleScopePlugin');
- const getClientEnvironment = require('./env');
- const paths = require('./paths');
- // Webpack uses `publicPath` to determine where the app is being served from.
- // In development, we always serve from the root. This makes config easier.
- const publicPath = '/';
- // `publicUrl` is just like `publicPath`, but we will provide it to our app
- // as %PUBLIC_URL% in `index.html` and `process.env.PUBLIC_URL` in JavaScript.
- // Omit trailing slash as %PUBLIC_PATH%/xyz looks better than %PUBLIC_PATH%xyz.
- const publicUrl = '';
- // Get environment variables to inject into our app.
- const env = getClientEnvironment(publicUrl);
- // 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 = {
- // You may want 'eval' instead if you prefer to see the compiled output in DevTools.
- // See the discussion in https://github.com/facebookincubator/create-react-app/issues/343.
- devtool: 'cheap-module-source-map',
- // 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 an alternative client for WebpackDevServer. A client's job is to
- // connect to WebpackDevServer by a socket and get notified about changes.
- // When you save a file, the client will either apply hot updates (in case
- // of CSS changes), or refresh the page (in case of JS changes). When you
- // make a syntax error, this client will display a syntax error overlay.
- // Note: instead of the default WebpackDevServer client, we use a custom one
- // to bring better experience for Create React App users. You can replace
- // the line below with these two lines if you prefer the stock client:
- // require.resolve('webpack-dev-server/client') + '?/',
- // require.resolve('webpack/hot/dev-server'),
- require.resolve('react-dev-utils/webpackHotDevClient'),
- // We ship a few polyfills by default:
- require.resolve('./polyfills'),
- // Errors should be considered fatal in development
- require.resolve('react-error-overlay'),
- // Finally, this is your app's code:
- paths.appIndexJs,
- // 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',
- // There are also additional JS chunk files if you use code splitting.
- chunkFilename: 'static/js/[name].chunk.js',
- // This is the URL that app is served from. We use "/" in development.
- publicPath: publicPath,
- // Point sourcemap entries to original disk location
- devtoolModuleFilenameTemplate: info =>
- path.resolve(info.absoluteResourcePath),
- },
- resolve: {
- // This allows you to set a fallback for where Webpack should look for modules.
- // We placed these paths second because we want `node_modules` to "win"
- // if there are any conflicts. This matches Node resolution mechanism.
- // https://github.com/facebookincubator/create-react-app/issues/253
- modules: ['node_modules', paths.appNodeModules].concat(
- // It is guaranteed to exist because we tweak it in `env.js`
- process.env.NODE_PATH.split(path.delimiter).filter(Boolean)
- ),
- // These are the reasonable defaults supported by the Node ecosystem.
- // We also include JSX as a common component filename extension to support
- // some tools, although we do not recommend using it, see:
- // https://github.com/facebookincubator/create-react-app/issues/290
- extensions: ['.js', '.json', '.jsx'],
- 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',
- },
- plugins: [
- // Prevents users from importing files from outside of src/ (or node_modules/).
- // This often causes confusion because we only process files within src/ with babel.
- // To fix this, we prevent you from importing files out of src/ -- if you'd like to,
- // please link the files into your node_modules/ and let module-resolution kick in.
- // Make sure your source files are compiled, as they will not be processed in any way.
- new ModuleScopePlugin(paths.appSrc),
- ],
- },
- module: {
- strictExportPresence: true,
- rules: [
- // TODO: Disable require.ensure as it's not a standard language feature.
- // We are waiting for https://github.com/facebookincubator/create-react-app/issues/2176.
- // { parser: { requireEnsure: false } },
- // First, run the linter.
- // It's important to do this before Babel processes the JS.
- {
- test: /\.(js|jsx)$/,
- enforce: 'pre',
- use: [
- {
- options: {
- formatter: eslintFormatter,
- },
- loader: require.resolve('eslint-loader'),
- },
- ],
- include: paths.appSrc,
- },
- // ** ADDING/UPDATING LOADERS **
- // The "file" loader handles all assets unless explicitly excluded.
- // The `exclude` list *must* be updated with every change to loader extensions.
- // When adding a new loader, you must add its `test`
- // as a new entry in the `exclude` list for "file" loader.
- // "file" loader makes sure those assets get served by WebpackDevServer.
- // When you `import` an asset, you get its (virtual) filename.
- // In production, they would get copied to the `build` folder.
- {
- exclude: [
- /\.html$/,
- /\.(js|jsx)$/,
- /\.css$/,
- /\.json$/,
- /\.bmp$/,
- /\.gif$/,
- /\.jpe?g$/,
- /\.png$/,
- ],
- loader: require.resolve('file-loader'),
- options: {
- name: 'static/media/[name].[hash:8].[ext]',
- },
- },
- // "url" loader works like "file" loader except that it embeds assets
- // smaller than specified limit in bytes as data URLs to avoid requests.
- // A missing `test` is equivalent to a match.
- {
- test: [/\.bmp$/, /\.gif$/, /\.jpe?g$/, /\.png$/],
- loader: require.resolve('url-loader'),
- options: {
- limit: 10000,
- name: 'static/media/[name].[hash:8].[ext]',
- },
- },
- // Process JS with Babel.
- {
- test: /\.(js|jsx)$/,
- include: paths.appSrc,
- loader: require.resolve('babel-loader'),
- options: {
- // This is a feature of `babel-loader` for webpack (not Babel itself).
- // It enables caching results in ./node_modules/.cache/babel-loader/
- // directory for faster rebuilds.
- cacheDirectory: true,
- },
- },
- // "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$/,
- use: [
- require.resolve('style-loader'),
- {
- loader: require.resolve('css-loader'),
- options: {
- importLoaders: 1,
- },
- },
- {
- loader: require.resolve('postcss-loader'),
- options: {
- ident: 'postcss', // https://webpack.js.org/guides/migrating/#complex-options
- plugins: () => [
- require('postcss-flexbugs-fixes'),
- autoprefixer({
- browsers: [
- '>1%',
- 'last 4 versions',
- 'Firefox ESR',
- 'not ie < 9', // React doesn't support IE8 anyway
- ],
- flexbox: 'no-2009',
- }),
- ],
- },
- },
- ],
- },
- // ** STOP ** Are you adding a new loader?
- // Remember to add the new extension(s) to the "file" loader exclusion list.
- ],
- },
- plugins: [
- // Makes some environment variables available in index.html.
- // The public URL is available as %PUBLIC_URL% in index.html, e.g.:
- // <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
- // In development, this will be an empty string.
- new InterpolateHtmlPlugin(env.raw),
- // 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.stringified),
- // 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),
- // Moment.js is an extremely popular library that bundles large locale files
- // by default due to how Webpack interprets its code. This is a practical
- // solution that requires the user to opt into importing specific locales.
- // https://github.com/jmblog/how-to-optimize-momentjs-with-webpack
- // You can remove this if you don't use Moment.js:
- new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/),
- ],
- // Some libraries import Node modules but don't use them in the browser.
- // Tell Webpack to provide empty mocks for them so importing them works.
- node: {
- fs: 'empty',
- net: 'empty',
- tls: 'empty',
- },
- // Turn off performance hints during development because we don't do any
- // splitting or minification in interest of speed. These warnings become
- // cumbersome.
- performance: {
- hints: false,
- },
- };
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