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

Author: Jean Lauliac

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;
       }
     }