'use strict'; const errorOverlayMiddleware = require('react-dev-utils/errorOverlayMiddleware'); const noopServiceWorkerMiddleware = require('react-dev-utils/noopServiceWorkerMiddleware'); const ignoredFiles = require('react-dev-utils/ignoredFiles'); const config = require('./webpack.config.dev'); const paths = require('./paths'); const protocol = process.env.HTTPS === 'true' ? 'https' : 'http'; const host = process.env.HOST || '0.0.0.0'; module.exports = function(proxy, allowedHost) { return { // WebpackDevServer 2.4.3 introduced a security fix that prevents remote // websites from potentially accessing local content through DNS rebinding: // https://github.com/webpack/webpack-dev-server/issues/887 // https://medium.com/webpack/webpack-dev-server-middleware-security-issues-1489d950874a // However, it made several existing use cases such as development in cloud // environment or subdomains in development significantly more complicated: // https://github.com/facebookincubator/create-react-app/issues/2271 // https://github.com/facebookincubator/create-react-app/issues/2233 // While we're investigating better solutions, for now we will take a // compromise. Since our WDS configuration only serves files in the `public` // folder we won't consider accessing them a vulnerability. However, if you // use the `proxy` feature, it gets more dangerous because it can expose // remote code execution vulnerabilities in backends like Django and Rails. // So we will disable the host check normally, but enable it if you have // specified the `proxy` setting. Finally, we let you override it if you // really know what you're doing with a special environment variable. disableHostCheck: !proxy || process.env.DANGEROUSLY_DISABLE_HOST_CHECK === 'true', // Enable gzip compression of generated files. compress: true, // Silence WebpackDevServer's own logs since they're generally not useful. // It will still show compile warnings and errors with this setting. clientLogLevel: 'none', // By default WebpackDevServer serves physical files from current directory // in addition to all the virtual build products that it serves from memory. // This is confusing because those files won’t automatically be available in // production build folder unless we copy them. However, copying the whole // project directory is dangerous because we may expose sensitive files. // Instead, we establish a convention that only files in `public` directory // get served. Our build script will copy `public` into the `build` folder. // In `index.html`, you can get URL of `public` folder with %PUBLIC_URL%: // // In JavaScript code, you can access it with `process.env.PUBLIC_URL`. // Note that we only recommend to use `public` folder as an escape hatch // for files like `favicon.ico`, `manifest.json`, and libraries that are // for some reason broken when imported through Webpack. If you just want to // use an image, put it in `src` and `import` it from JavaScript instead. contentBase: paths.appPublic, // By default files from `contentBase` will not trigger a page reload. watchContentBase: true, // Enable hot reloading server. It will provide /sockjs-node/ endpoint // for the WebpackDevServer client so it can learn when the files were // updated. The WebpackDevServer client is included as an entry point // in the Webpack development configuration. Note that only changes // to CSS are currently hot reloaded. JS changes will refresh the browser. hot: true, // It is important to tell WebpackDevServer to use the same "root" path // as we specified in the config. In development, we always serve from /. publicPath: config.output.publicPath, // WebpackDevServer is noisy by default so we emit custom message instead // by listening to the compiler events with `compiler.plugin` calls above. quiet: true, // Reportedly, this avoids CPU overload on some systems. // https://github.com/facebookincubator/create-react-app/issues/293 // src/node_modules is not ignored to support absolute imports // https://github.com/facebookincubator/create-react-app/issues/1065 watchOptions: { ignored: ignoredFiles(paths.appSrc), }, // Enable HTTPS if the HTTPS environment variable is set to 'true' https: protocol === 'https', host: host, overlay: false, historyApiFallback: { // Paths with dots should still use the history fallback. // See https://github.com/facebookincubator/create-react-app/issues/387. disableDotRule: true, }, public: allowedHost, proxy, before(app) { // This lets us open files from the runtime error overlay. app.use(errorOverlayMiddleware()); // This service worker file is effectively a 'no-op' that will reset any // previous service worker registered for the same host:port combination. // We do this in development to avoid hitting the production cache if // it used the same host and port. // https://github.com/facebookincubator/create-react-app/issues/2272#issuecomment-302832432 app.use(noopServiceWorkerMiddleware()); }, }; };