Webpack4 (facebook#4490)

* - [x] Upgrade to webpack 4.8.X
- [x] Utilize webpack 4 development and production modes
- [x] Upgrade webpack dev server
- [x] Webpack 4 compatible release of thread-loader
- [x] Webpack 4 compatible release of HtmlWebpackPlugin
- [x] Webpack 4 compatible release of SwPrecacheWebpackPlugin
- [x] Webpack 4 compatible release of WebpackManifestPlugin
- [x] Update README
- [x] Update WebpackDevServerUtils
- [x] Update InterpolateHtmlPlugin
- [x] Update ModuleScopePlugin
- [x] Update WatchMissingNodeModulesPlugin
- [x] Move UglifyJS options to webpack 4 optimize
- [x] Move InterpolateHtmlPlugin to make it tapable on HtmlWebpackPlugin
- [x] vendor splitting via splitChunks.splitChunks (https://twitter.com/wSokra/status/969633336732905474)
- [x] long term caching via splitChunks.runtimeChunk (https://twitter.com/wSokra/status/969679223278505985)
- [x] Make sure process.env.NODE_ENV is proxied correctly to `react-error-overlay`
- [x] Implicit webpack.NamedModulesPlugin in dev config as its default in webpack 4
- [x] Disable webpack performance hints as we have our own filesize reporter
- [x] Replace ExtractTextPlugin with MiniCssExtractPlugin
- [x] Switch to css whole file minification via OptimizeCSSAssetsPlugin rather than per module css minification to gain performance

* disable module concatenation

* fix cleanup

* fix optimization

* restore tmp removal

* preserve

* fix css tests

* fix test run

* fix svg test

* revert tmp dir

* fix import

* fix import

* help debugging

* fix tests

* fix sass test

* restore cleanup

Author: Jack Zhao

config/webpack.config.prod.js

@@ -115,6 +115,8 @@ module.exports = {
         .replace(/\\/g, '/'),
   },
   optimization: {
+    // webpack-manifest-plugin currently does not play well with ConcatenatedModule
+    concatenateModules: false,
     minimizer: [
       new UglifyJsPlugin({
         uglifyOptions: {

fixtures/kitchensink/integration/initDOM.js

@@ -12,7 +12,7 @@ const path = require('path');
 const { expect } = require('chai');
 
 let getMarkup;
-let resourceLoader;
+export let resourceLoader;
 
 if (process.env.E2E_FILE) {
   const file = path.isAbsolute(process.env.E2E_FILE)
@@ -47,25 +47,18 @@ if (process.env.E2E_FILE) {
 
   resourceLoader = (resource, callback) => resource.defaultFetch(callback);
 } else {
-  it.only(
-    'can run jsdom (at least one of "E2E_FILE" or "E2E_URL" environment variables must be provided)',
-    () => {
-      expect(
-        new Error("This isn't the error you are looking for.")
-      ).to.be.undefined();
-    }
-  );
+  it.only('can run jsdom (at least one of "E2E_FILE" or "E2E_URL" environment variables must be provided)', () => {
+    expect(
+      new Error("This isn't the error you are looking for.")
+    ).to.be.undefined();
+  });
 }
 
 export default feature =>
   new Promise(async resolve => {
     const markup = await getMarkup();
     const host = process.env.E2E_URL || 'http://www.example.org/spa:3000';
     const doc = jsdom.jsdom(markup, {
-      features: {
-        FetchExternalResources: ['script', 'css'],
-        ProcessExternalResources: ['script'],
-      },
       created: (_, win) =>
         win.addEventListener('ReactFeatureDidMount', () => resolve(doc), true),
       deferClose: true,

fixtures/kitchensink/integration/webpack.test.js

@@ -6,78 +6,68 @@
  */
 
 import { expect } from 'chai';
-import initDOM from './initDOM';
+import initDOM, { resourceLoader } from './initDOM';
+import url from 'url';
+
+const matchCSS = (doc, regexes) => {
+  if (process.env.E2E_FILE) {
+      const elements = doc.getElementsByTagName('link');
+      let href = "";
+      for (const elem of elements) {
+        if (elem.rel === 'stylesheet') {
+          href = elem.href;
+        }
+      }
+      resourceLoader(
+        { url: url.parse(href) },
+        (_, textContent) => {
+          for (const regex of regexes) {
+          expect(textContent).to.match(regex);
+          }
+        }
+      );
+    
+  } else {
+    for (let i = 0; i < regexes.length; ++i) {
+      expect(doc.getElementsByTagName('style')[i].textContent.replace(/\s/g, '')).to.match(regexes[i]);
+    }
+  }
+}
 
 describe('Integration', () => {
   describe('Webpack plugins', () => {
     it('css inclusion', async () => {
       const doc = await initDOM('css-inclusion');
-
-      expect(
-        doc.getElementsByTagName('style')[0].textContent.replace(/\s/g, '')
-      ).to.match(/html\{/);
-      expect(
-        doc.getElementsByTagName('style')[1].textContent.replace(/\s/g, '')
-      ).to.match(/#feature-css-inclusion\{background:.+;color:.+}/);
+      matchCSS(doc, [/html\{/, /#feature-css-inclusion\{background:.+;color:.+}/]);
     });
 
     it('css modules inclusion', async () => {
       const doc = await initDOM('css-modules-inclusion');
-
-      expect(
-        doc.getElementsByTagName('style')[0].textContent.replace(/\s/g, '')
-      ).to.match(/.+style_cssModulesInclusion__.+\{background:.+;color:.+}/);
-      expect(
-        doc.getElementsByTagName('style')[1].textContent.replace(/\s/g, '')
-      ).to.match(
-        /.+assets_cssModulesIndexInclusion__.+\{background:.+;color:.+}/
-      );
+      matchCSS(doc, [/.+style_cssModulesInclusion__.+\{background:.+;color:.+}/,
+            /.+assets_cssModulesIndexInclusion__.+\{background:.+;color:.+}/]);
     });
 
     it('scss inclusion', async () => {
       const doc = await initDOM('scss-inclusion');
-
-      expect(
-        doc.getElementsByTagName('style')[0].textContent.replace(/\s/g, '')
-      ).to.match(/#feature-scss-inclusion\{background:.+;color:.+}/);
+      matchCSS(doc, [/#feature-scss-inclusion\{background:.+;color:.+}/]);
     });
 
     it('scss modules inclusion', async () => {
       const doc = await initDOM('scss-modules-inclusion');
-
-      expect(
-        doc.getElementsByTagName('style')[0].textContent.replace(/\s/g, '')
-      ).to.match(
-        /.+scss-styles_scssModulesInclusion.+\{background:.+;color:.+}/
-      );
-      expect(
-        doc.getElementsByTagName('style')[1].textContent.replace(/\s/g, '')
-      ).to.match(
-        /.+assets_scssModulesIndexInclusion.+\{background:.+;color:.+}/
-      );
+      matchCSS(doc, [/.+scss-styles_scssModulesInclusion.+\{background:.+;color:.+}/,
+        /.+assets_scssModulesIndexInclusion.+\{background:.+;color:.+}/]);
+      
     });
 
     it('sass inclusion', async () => {
       const doc = await initDOM('sass-inclusion');
-
-      expect(
-        doc.getElementsByTagName('style')[0].textContent.replace(/\s/g, '')
-      ).to.match(/#feature-sass-inclusion\{background:.+;color:.+}/);
+      matchCSS(doc, [/#feature-sass-inclusion\{background:.+;color:.+}/]);
     });
 
     it('sass modules inclusion', async () => {
       const doc = await initDOM('sass-modules-inclusion');
-
-      expect(
-        doc.getElementsByTagName('style')[0].textContent.replace(/\s/g, '')
-      ).to.match(
-        /.+sass-styles_sassModulesInclusion.+\{background:.+;color:.+}/
-      );
-      expect(
-        doc.getElementsByTagName('style')[1].textContent.replace(/\s/g, '')
-      ).to.match(
-        /.+assets_sassModulesIndexInclusion.+\{background:.+;color:.+}/
-      );
+      matchCSS(doc, [/.+sass-styles_sassModulesInclusion.+\{background:.+;color:.+}/,
+            /.+assets_sassModulesIndexInclusion.+\{background:.+;color:.+}/]);
     });
 
     it('graphql files inclusion', async () => {
@@ -124,7 +114,6 @@ describe('Integration', () => {
 
     it('svg inclusion', async () => {
       const doc = await initDOM('svg-inclusion');
-
       expect(doc.getElementById('feature-svg-inclusion').src).to.match(
         /\/static\/media\/logo\..+\.svg$/
       );
@@ -140,10 +129,7 @@ describe('Integration', () => {
 
     it('svg in css', async () => {
       const doc = await initDOM('svg-in-css');
-
-      expect(
-        doc.getElementsByTagName('style')[0].textContent.replace(/\s/g, '')
-      ).to.match(/\/static\/media\/logo\..+\.svg/);
+      matchCSS(doc, [/\/static\/media\/logo\..+\.svg/]);
     });
 
     it('unknown ext inclusion', async () => {