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webpackDevServer.config.js 5.5KB

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  1. 'use strict';
  2. const errorOverlayMiddleware = require('react-dev-utils/errorOverlayMiddleware');
  3. const evalSourceMapMiddleware = require('react-dev-utils/evalSourceMapMiddleware');
  4. const noopServiceWorkerMiddleware = require('react-dev-utils/noopServiceWorkerMiddleware');
  5. const ignoredFiles = require('react-dev-utils/ignoredFiles');
  6. const paths = require('./paths');
  7. const fs = require('fs');
  8. const protocol = process.env.HTTPS === 'true' ? 'https' : 'http';
  9. const host = process.env.HOST || '0.0.0.0';
  10. module.exports = function(proxy, allowedHost) {
  11. return {
  12. // WebpackDevServer 2.4.3 introduced a security fix that prevents remote
  13. // websites from potentially accessing local content through DNS rebinding:
  14. // https://github.com/webpack/webpack-dev-server/issues/887
  15. // https://medium.com/webpack/webpack-dev-server-middleware-security-issues-1489d950874a
  16. // However, it made several existing use cases such as development in cloud
  17. // environment or subdomains in development significantly more complicated:
  18. // https://github.com/facebook/create-react-app/issues/2271
  19. // https://github.com/facebook/create-react-app/issues/2233
  20. // While we're investigating better solutions, for now we will take a
  21. // compromise. Since our WDS configuration only serves files in the `public`
  22. // folder we won't consider accessing them a vulnerability. However, if you
  23. // use the `proxy` feature, it gets more dangerous because it can expose
  24. // remote code execution vulnerabilities in backends like Django and Rails.
  25. // So we will disable the host check normally, but enable it if you have
  26. // specified the `proxy` setting. Finally, we let you override it if you
  27. // really know what you're doing with a special environment variable.
  28. disableHostCheck:
  29. !proxy || process.env.DANGEROUSLY_DISABLE_HOST_CHECK === 'true',
  30. // Enable gzip compression of generated files.
  31. compress: true,
  32. // Silence WebpackDevServer's own logs since they're generally not useful.
  33. // It will still show compile warnings and errors with this setting.
  34. clientLogLevel: 'none',
  35. // By default WebpackDevServer serves physical files from current directory
  36. // in addition to all the virtual build products that it serves from memory.
  37. // This is confusing because those files won’t automatically be available in
  38. // production build folder unless we copy them. However, copying the whole
  39. // project directory is dangerous because we may expose sensitive files.
  40. // Instead, we establish a convention that only files in `public` directory
  41. // get served. Our build script will copy `public` into the `build` folder.
  42. // In `index.html`, you can get URL of `public` folder with %PUBLIC_URL%:
  43. // <link rel="shortcut icon" href="%PUBLIC_URL%/favicon.ico">
  44. // In JavaScript code, you can access it with `process.env.PUBLIC_URL`.
  45. // Note that we only recommend to use `public` folder as an escape hatch
  46. // for files like `favicon.ico`, `manifest.json`, and libraries that are
  47. // for some reason broken when imported through Webpack. If you just want to
  48. // use an image, put it in `src` and `import` it from JavaScript instead.
  49. contentBase: paths.appPublic,
  50. // By default files from `contentBase` will not trigger a page reload.
  51. watchContentBase: true,
  52. // Enable hot reloading server. It will provide /sockjs-node/ endpoint
  53. // for the WebpackDevServer client so it can learn when the files were
  54. // updated. The WebpackDevServer client is included as an entry point
  55. // in the Webpack development configuration. Note that only changes
  56. // to CSS are currently hot reloaded. JS changes will refresh the browser.
  57. hot: true,
  58. // It is important to tell WebpackDevServer to use the same "root" path
  59. // as we specified in the config. In development, we always serve from /.
  60. publicPath: '/',
  61. // WebpackDevServer is noisy by default so we emit custom message instead
  62. // by listening to the compiler events with `compiler.hooks[...].tap` calls above.
  63. quiet: true,
  64. // Reportedly, this avoids CPU overload on some systems.
  65. // https://github.com/facebook/create-react-app/issues/293
  66. // src/node_modules is not ignored to support absolute imports
  67. // https://github.com/facebook/create-react-app/issues/1065
  68. watchOptions: {
  69. ignored: ignoredFiles(paths.appSrc),
  70. },
  71. // Enable HTTPS if the HTTPS environment variable is set to 'true'
  72. https: protocol === 'https',
  73. host,
  74. overlay: false,
  75. historyApiFallback: {
  76. // Paths with dots should still use the history fallback.
  77. // See https://github.com/facebook/create-react-app/issues/387.
  78. disableDotRule: true,
  79. },
  80. public: allowedHost,
  81. proxy,
  82. before(app, server) {
  83. if (fs.existsSync(paths.proxySetup)) {
  84. // This registers user provided middleware for proxy reasons
  85. require(paths.proxySetup)(app);
  86. }
  87. // This lets us fetch source contents from webpack for the error overlay
  88. app.use(evalSourceMapMiddleware(server));
  89. // This lets us open files from the runtime error overlay.
  90. app.use(errorOverlayMiddleware());
  91. // This service worker file is effectively a 'no-op' that will reset any
  92. // previous service worker registered for the same host:port combination.
  93. // We do this in development to avoid hitting the production cache if
  94. // it used the same host and port.
  95. // https://github.com/facebook/create-react-app/issues/2272#issuecomment-302832432
  96. app.use(noopServiceWorkerMiddleware());
  97. },
  98. };
  99. };