Upgrade to Webpack 5

Needed for future Docker compatibility.

Manually applied many of the PRs from facebook/create-react-app#9994
and facebook/create-react-app#7929 (including comments)

Author: mbarrien

src/ts/config/mocks/dns.js

@@ -0,0 +1,14 @@
+// See https://github.com/webpack/node-libs-browser/blob/214057f118bad5da8b99db33fd16a5b6ceb42d9b/mock/dns.js
+
+'use strict';
+
+module.exports.lookup = module.exports.resolve4 = module.exports.resolve6 = module.exports.resolveCname = module.exports.resolveMx = module.exports.resolveNs = module.exports.resolveTxt = module.exports.resolveSrv = module.exports.resolveNaptr = module.exports.reverse = module.exports.resolve = function() {
+  if (!arguments.length) {
+    return;
+  }
+
+  var callback = arguments[arguments.length - 1];
+  if (callback && typeof callback === 'function') {
+    callback(null, '0.0.0.0');
+  }
+};

src/ts/config/mocks/empty.js

@@ -0,0 +1,3 @@
+'use strict';
+
+module.exports = null;

src/ts/config/webpack.config.js

@@ -12,7 +12,7 @@ const TerserPlugin = require("terser-webpack-plugin");
 const MiniCssExtractPlugin = require("mini-css-extract-plugin");
 const OptimizeCSSAssetsPlugin = require("optimize-css-assets-webpack-plugin");
 const safePostCssParser = require("postcss-safe-parser");
-const ManifestPlugin = require("webpack-manifest-plugin");
+const { WebpackManifestPlugin } = require("webpack-manifest-plugin");
 const InterpolateHtmlPlugin = require("react-dev-utils/InterpolateHtmlPlugin");
 const WorkboxWebpackPlugin = require("workbox-webpack-plugin");
 const WatchMissingNodeModulesPlugin = require("react-dev-utils/WatchMissingNodeModulesPlugin");
@@ -107,23 +107,25 @@ module.exports = function (webpackEnv) {
         // package.json
         loader: require.resolve("postcss-loader"),
         options: {
-          // Necessary for external CSS imports to work
-          // https://github.com/facebook/create-react-app/issues/2677
-          ident: "postcss",
-          plugins: () => [
-            require("postcss-flexbugs-fixes"),
-            require("postcss-preset-env")({
-              autoprefixer: {
-                flexbox: "no-2009",
-              },
-              stage: 3,
-            }),
-            // Adds PostCSS Normalize as the reset css with default options,
-            // so that it honors browserslist config in package.json
-            // which in turn let's users customize the target behavior as per their needs.
-            postcssNormalize(),
-          ],
-          sourceMap: isEnvProduction ? shouldUseSourceMap : isEnvDevelopment,
+          postcssOptions: {
+            plugins: [
+              require('postcss-flexbugs-fixes'),
+              [
+                require('postcss-preset-env'),
+                {
+                  autoprefixer: {
+                    flexbox: 'no-2009',
+                  },
+                  stage: 3,
+                },
+              ],
+              // Adds PostCSS Normalize as the reset css with default options,
+              // so that it honors browserslist config in package.json
+              // which in turn let's users customize the target behavior as per their needs.
+              postcssNormalize(),
+            ],
+          },
+          sourceMap: isEnvProduction && shouldUseSourceMap,
         },
       },
     ].filter(Boolean);
@@ -167,9 +169,7 @@ module.exports = function (webpackEnv) {
       // There will be one main bundle, and one file per asynchronous chunk.
       filename: isEnvProduction
         ? "js/[name].[contenthash:8].js"
-        : isEnvDevelopment && "js/bundle.js",
-      // TODO: remove this when upgrading to webpack 5
-      futureEmitAssets: true,
+        : isEnvDevelopment && "js/[name].js",
       // There are also additional JS chunk files if you use code splitting.
       chunkFilename: isEnvProduction
         ? "js/[name].[contenthash:8].chunk.js"
@@ -187,9 +187,6 @@ module.exports = function (webpackEnv) {
         : isEnvDevelopment &&
           ((info) =>
             path.resolve(info.absoluteResourcePath).replace(/\\/g, "/")),
-      // Prevents conflicts when multiple webpack runtimes (from different apps)
-      // are used on the same page.
-      jsonpFunction: `webpackJsonp${appPackageJson.name}`,
       // this defaults to 'window', but by setting it to 'this' then
       // module chunks which are built will work in web workers as well.
       globalObject: "this",
@@ -236,7 +233,6 @@ module.exports = function (webpackEnv) {
               ascii_only: true,
             },
           },
-          sourceMap: shouldUseSourceMap,
         }),
         // This is only used in production mode
         new OptimizeCSSAssetsPlugin({
@@ -589,7 +585,7 @@ module.exports = function (webpackEnv) {
       //   `index.html`
       // - "entrypoints" key: Array of files which are included in `index.html`,
       //   can be used to reconstruct the HTML if necessary
-      new ManifestPlugin({
+      new WebpackManifestPlugin({
         fileName: "asset-manifest.json",
         publicPath: paths.publicUrlOrPath,
         generate: (seed, files, entrypoints) => {
@@ -612,7 +608,10 @@ module.exports = function (webpackEnv) {
       // solution that requires the user to opt into importing specific locales.
       // https://github.com/jmblog/how-to-optimize-momentjs-with-webpack
       // You can remove this if you don't use Moment.js:
-      new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/),
+      new webpack.IgnorePlugin({
+        resourceRegExp: /^\.\/locale$/,
+        contextRegExp: /moment$/,
+      }),
       // Generate a service worker script that will precache, and keep up to date,
       // the HTML & assets that are part of the webpack build.
       isEnvProduction &&
@@ -628,34 +627,46 @@ module.exports = function (webpackEnv) {
         }),
       // TypeScript type checking
       useTypeScript &&
-        new ForkTsCheckerWebpackPlugin({
-          typescript: resolve.sync("typescript", {
+      new ForkTsCheckerWebpackPlugin({
+        typescript: {
+          typescriptPath: resolve.sync('typescript', {
             basedir: paths.appNodeModules,
           }),
-          async: false,
-          checkSyntacticErrors: true,
-          resolveModuleNameModule: process.versions.pnp
-            ? `${__dirname}/pnpTs.js`
-            : undefined,
-          resolveTypeReferenceDirectiveModule: process.versions.pnp
-            ? `${__dirname}/pnpTs.js`
-            : undefined,
-          tsconfig: paths.appTsConfig,
-          reportFiles: [
-            // This one is specifically to match during CI tests,
-            // as micromatch doesn't match
-            // '../cra-template-typescript/template/src/App.tsx'
-            // otherwise.
-            "../**/src/**/*.{ts,tsx}",
-            "**/src/**/*.{ts,tsx}",
-            "!**/src/**/__tests__/**",
-            "!**/src/**/?(*.)(spec|test).*",
-            "!**/src/setupProxy.*",
-            "!**/src/setupTests.*",
-          ],
-          silent: true,
-          formatter: typescriptFormatter,
-        }),
+          configOverwrite: {
+            compilerOptions: {
+              sourceMap: isEnvProduction
+                ? shouldUseSourceMap
+                : isEnvDevelopment,
+              skipLibCheck: true,
+              inlineSourceMap: false,
+              declarationMap: false,
+              noEmit: true,
+              incremental: true,
+            },
+          },
+          context: paths.appPath,
+          diagnosticOptions: {
+            syntactic: true,
+          },
+          mode: 'write-references',
+          // profile: true,
+        },
+        issue: {
+          include: [
+            '../**/src/**/*.{ts,tsx}',
+            '**/src/**/*.{ts,tsx}',
+          ].map(file => ({ file })),
+          exclude: [
+            '**/src/**/__tests__/**',
+            '**/src/**/?(*.)(spec|test).*',
+            '**/src/setupProxy.*',
+            '**/src/setupTests.*',
+          ].map(file => ({ file })),
+        },
+        logger: {
+          infrastructure: 'silent',
+        },
+      }),
       // new ESLintPlugin({
       //   // Plugin options
       //   extensions: ['js', 'mjs', 'jsx', 'ts', 'tsx'],
@@ -676,18 +687,6 @@ module.exports = function (webpackEnv) {
       //   },
       // }),
     ].filter(Boolean),
-    // 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: {
-      module: "empty",
-      dgram: "empty",
-      dns: "mock",
-      fs: "empty",
-      http2: "empty",
-      net: "empty",
-      tls: "empty",
-      child_process: "empty",
-    },
     // Turn off performance processing because we utilize
     // our own hints via the FileSizeReporter
     performance: false,