jest-haste-map: fix bug where platform-specific files are removed (#5534)

* jest-haste-map: fix bug where platform-specific files are removed

* add to changelog

Author: jeanlauliac

CHANGELOG.md

@@ -1,5 +1,10 @@
 ## master
 
+### Fixes
+
+* `[jest-haste-map]` Properly handle platform-specific file deletions
+  ([#5534](https://github.com/facebook/jest/pull/5534))
+
 ### Features
 
 * `[jest-util]` Add the following methods to the "console" implementations:

packages/jest-haste-map/src/__tests__/index.test.js

@@ -586,7 +586,7 @@ describe('HasteMap', () => {
     });
   });
 
-  it('correctly handles platform-specific file deletions (broken)', async () => {
+  it('correctly handles platform-specific file deletions', async () => {
     mockFs = Object.create(null);
     mockFs['/fruits/strawberry.js'] = [
       '/**',
@@ -613,8 +613,6 @@ describe('HasteMap', () => {
     ({__hasteMapForTest: data} = await new HasteMap(defaultConfig).build());
     expect(data.map['Strawberry']).toEqual({
       g: ['/fruits/strawberry.js', 0],
-      // FIXME: this file should NOT exist anymore!
-      ios: ['/fruits/strawberry.ios.js', 0],
     });
   });
 

packages/jest-haste-map/src/index.js

@@ -422,8 +422,18 @@ class HasteMap extends EventEmitter {
     if (fileMetadata[H.VISITED]) {
       if (!fileMetadata[H.ID]) {
         return null;
-      } else if (fileMetadata[H.ID] && moduleMetadata) {
-        map[fileMetadata[H.ID]] = moduleMetadata;
+      }
+      if (moduleMetadata != null) {
+        const platform =
+          getPlatformExtension(filePath, this._options.platforms) ||
+          H.GENERIC_PLATFORM;
+        const module = moduleMetadata[platform];
+        if (module == null) {
+          return null;
+        }
+        const modulesByPlatform =
+          map[fileMetadata[H.ID]] || (map[fileMetadata[H.ID]] = {});
+        modulesByPlatform[platform] = module;
         return null;
       }
     }

website/pages/en/videos.js

@@ -36,7 +36,9 @@ class Videos extends React.Component {
       ({title, description, type, url}, index) => {
         const textMarkup = (
           <div className="blockContent">
-            <h2><a href={url}>{title}</a></h2>
+            <h2>
+              <a href={url}>{title}</a>
+            </h2>
             <div>
               <MarkdownBlock>{description}</MarkdownBlock>
             </div>