feat(@angular/cli): hash loaded media by default (#4878)

Currently dev builds use `--output-hashing=none` by default.

This can cause image resources to be overwritten in dev if they have the same same.

This wasn't much of a problem before when only images in global CSS would be treated as resources, but now component css also does that.

Production builds are unaffected since they already use `--output-hashing=all`.

BREAKING CHANGE: dev builds will hash relative resources from CSS (images, etc).

packages/@angular/cli/models/webpack-config.ts

@@ -78,7 +78,7 @@ export class NgCliWebpackConfig {
     const targetDefaults: any = {
       development: {
         environment: 'dev',
-        outputHashing: 'none',
+        outputHashing: 'media',
         sourcemap: true,
         extractCss: false
       },

tests/e2e/tests/build/css-urls.ts

@@ -1,7 +1,9 @@
+import * as fs from 'fs';
 import { ng } from '../../utils/process';
 import {
   expectFileToMatch,
   expectFileToExist,
+  expectFileMatchToExist,
   writeMultipleFiles
 } from '../../utils/fs';
 import { expectToFail } from '../../utils/utils';
@@ -33,24 +35,27 @@ export default function () {
     .then(() => ng('build', '--extract-css', '--aot'))
     // Check paths are correctly generated.
     .then(() => expectFileToMatch('dist/styles.bundle.css',
-      `url\('\/assets\/global-img-absolute\.svg'\)`))
+      /url\('\/assets\/global-img-absolute\.svg'\)/))
-    .then(() => expectFileToMatch('dist/styles.bundle.css', 'url\(global-img-relative.svg\)'))
+    .then(() => expectFileToMatch('dist/styles.bundle.css',
+      /url\(global-img-relative\.[0-9a-f]{20}\.svg\)/))
     .then(() => expectFileToMatch('dist/main.bundle.js',
-      `url\(\\'\/assets\/component-img-absolute\.svg\\'\)`))
+      /url\(\\'\/assets\/component-img-absolute\.svg\\'\)/))
-    .then(() => expectFileToMatch('dist/main.bundle.js', 'url\(component-img-relative\.svg\)'))
+    .then(() => expectFileToMatch('dist/main.bundle.js',
+      /url\(component-img-relative\.[0-9a-f]{20}\.svg\)/))
     // Check files are correctly created.
     .then(() => expectToFail(() => expectFileToExist('dist/global-img-absolute.svg')))
-    .then(() => expectFileToExist('dist/global-img-relative.svg'))
     .then(() => expectToFail(() => expectFileToExist('dist/component-img-absolute.svg')))
-    .then(() => expectFileToExist('dist/component-img-relative.svg'))
+    .then(() => expectFileMatchToExist('./dist', /global-img-relative\.[0-9a-f]{20}\.svg/))
+    .then(() => expectFileMatchToExist('./dist', /component-img-relative\.[0-9a-f]{20}\.svg/))
     // Also check with base-href and deploy-url flags.
     .then(() => ng('build', '--base-href=/base/', '--deploy-url=deploy/',
       '--extract-css', '--aot'))
     .then(() => expectFileToMatch('dist/styles.bundle.css',
-      `url\('\/base\/deploy\/assets\/global-img-absolute\.svg'\)`))
+      /url\('\/base\/deploy\/assets\/global-img-absolute\.svg'\)/))
-    .then(() => expectFileToMatch('dist/styles.bundle.css', 'url\(global-img-relative.svg\)'))
+    .then(() => expectFileToMatch('dist/styles.bundle.css',
+      /url\(global-img-relative\.[0-9a-f]{20}\.svg\)/))
     .then(() => expectFileToMatch('dist/main.bundle.js',
-      `url\(\\'\/base\/deploy\/assets\/component-img-absolute\.svg\\'\)`))
+      /url\(\\'\/base\/deploy\/assets\/component-img-absolute\.svg\\'\)/))
     .then(() => expectFileToMatch('dist/main.bundle.js',
-      'url\(deploy/component-img-relative\.svg\)'));
+      /url\(deploy\/component-img-relative\.[0-9a-f]{20}\.svg\)/));
 }

tests/e2e/tests/build/deploy-url.ts

@@ -16,7 +16,7 @@ export default function () {
     .then(() => ng('build', '--deploy-url=deployUrl/', '--extract-css'))
     .then(() => expectFileToMatch('dist/index.html', 'deployUrl/main.bundle.js'))
     // verify --deploy-url isn't applied to extracted css urls
-    .then(() => expectFileToMatch('dist/styles.bundle.css', 'url\(more.svg\)'))
+    .then(() => expectFileToMatch('dist/styles.bundle.css', /url\(more\.[0-9a-f]{20}\.svg\)/))
     // verify option also works in config
     .then(() => updateJsonFile('.angular-cli.json', configJson => {
       const app = configJson['apps'][0];
@@ -27,5 +27,5 @@ export default function () {
     // verify --deploy-url is applied to non-extracted css urls
     .then(() => ng('build', '--deploy-url=deployUrl/', '--extract-css=false'))
     .then(() => expectFileToMatch('dist/styles.bundle.js',
-      '__webpack_require__.p \+ \"more.svg\"'));
+      /__webpack_require__.p \+ \"more\.[0-9a-f]{20}\.svg\"/));
 }

tests/e2e/tests/build/output-hashing.ts

@@ -1,16 +1,9 @@
 import {stripIndents} from 'common-tags';
-import * as fs from 'fs';
 import {ng} from '../../utils/process';
-import { writeMultipleFiles, expectFileToMatch } from '../../utils/fs';
+import { writeMultipleFiles, expectFileToMatch, expectFileMatchToExist } from '../../utils/fs';
 
 function verifyMedia(css: RegExp, content: RegExp) {
-  return new Promise((resolve, reject) => {
+  return expectFileMatchToExist('./dist', css)
-    const [fileName] = fs.readdirSync('./dist').filter(name => name.match(css));
-    if (!fileName) {
-      reject(new Error(`File ${fileName} was expected to exist but not found...`));
-    }
-    resolve(fileName);
-  })
     .then(fileName => expectFileToMatch(`dist/${fileName}`, content));
 }
 

tests/e2e/utils/fs.ts

@@ -120,6 +120,16 @@ export function prependToFile(filePath: string, text: string, options?: any) {
 }
 
 
+export function expectFileMatchToExist(dir: string, regex: RegExp) {
+  return new Promise((resolve, reject) => {
+    const [fileName] = fs.readdirSync(dir).filter(name => name.match(regex));
+    if (!fileName) {
+      reject(new Error(`File ${regex} was expected to exist but not found...`));
+    }
+    resolve(fileName);
+  });
+}
+
 export function expectFileToExist(fileName: string) {
   return new Promise((resolve, reject) => {
     fs.exists(fileName, (exist) => {