Get rid of outdated_dependencies

Reviewed By: jeanlauliac

Differential Revision: D6485979

fbshipit-source-id: 8cf21a8c531d96df93f66e1cc465fe7ae044ef8e

packages/metro/src/lib/TransformCaching.js

@@ -37,10 +37,7 @@ export type CachedResult = {
   map: CompactRawMappings,
 };
 
-export type TransformCacheResult = {|
+export type TransformCacheResult = ?CachedResult;
-  +result: ?CachedResult,
-  +outdatedDependencies: $ReadOnlyArray<string>,
-|};
 
 export type CacheOptions = {
   reporter: Reporter,
@@ -74,8 +71,6 @@ export type TransformCache = {
   readSync(props: ReadTransformProps): TransformCacheResult,
 };
 
-const EMPTY_ARRAY = [];
-
 /* 1 day */
 const GARBAGE_COLLECTION_PERIOD = 24 * 60 * 60 * 1000;
 /* 4 days */
@@ -181,7 +176,7 @@ class FileBasedCache {
       return this._readFilesSync(props);
     } catch (error) {
       if (error.code === 'ENOENT') {
-        return {result: null, outdatedDependencies: EMPTY_ARRAY};
+        return null;
       }
       throw error;
     }
@@ -191,11 +186,11 @@ class FileBasedCache {
     const cacheFilePaths = this._getCacheFilePaths(props);
     const metadata = readMetadataFileSync(cacheFilePaths.metadata);
     if (metadata == null) {
-      return {result: null, outdatedDependencies: EMPTY_ARRAY};
+      return null;
     }
     const sourceHash = hashSourceCode(props);
     if (sourceHash !== metadata.cachedSourceHash) {
-      return {result: null, outdatedDependencies: metadata.dependencies};
+      return null;
     }
     const transformedCode = fs.readFileSync(
       cacheFilePaths.transformedCode,
@@ -206,15 +201,12 @@ class FileBasedCache {
       .update(transformedCode)
       .digest('hex');
     if (metadata.cachedResultHash !== codeHash) {
-      return {result: null, outdatedDependencies: metadata.dependencies};
+      return null;
     }
     return {
-      result: {
       code: transformedCode,
       dependencies: metadata.dependencies,
       map: metadata.sourceMap,
-      },
-      outdatedDependencies: EMPTY_ARRAY,
     };
   }
 
@@ -411,10 +403,7 @@ function unlinkIfExistsSync(filePath: string) {
 function none(): TransformCache {
   return {
     writeSync: () => {},
-    readSync: () => ({
+    readSync: () => null,
-      result: null,
-      outdatedDependencies: [],
-    }),
   };
 }
 

packages/metro/src/lib/__mocks__/TransformCaching.js

@@ -49,10 +49,7 @@ class TransformCacheMock {
   }
 
   readSync(props) {
-    return {
+    return transformCache.get(transformCacheKeyOf(props));
-      result: transformCache.get(transformCacheKeyOf(props)),
-      outdatedDependencies: [],
-    };
   }
 }
 

packages/metro/src/lib/__tests__/TransformCaching-test.js

@@ -87,7 +87,7 @@ describe('TransformCaching.FileBasedCache', () => {
         ...args,
         cacheOptions: {reporter: {}, resetCache: false},
       });
-      expect(cachedResult.result).toEqual(result);
+      expect(cachedResult).toEqual(result);
     });
   });
 
@@ -119,7 +119,7 @@ describe('TransformCaching.FileBasedCache', () => {
         ...args,
         cacheOptions: {reporter: {}, resetCache: false},
       });
-      expect(cachedResult.result).toEqual(result);
+      expect(cachedResult).toEqual(result);
     });
     allCases.pop();
     allCases.forEach(entry => {
@@ -127,8 +127,7 @@ describe('TransformCaching.FileBasedCache', () => {
         ...argsFor(entry),
         cacheOptions: {reporter: {}, resetCache: false},
       });
-      expect(cachedResult.result).toBeNull();
+      expect(cachedResult).toBeNull();
-      expect(cachedResult.outdatedDependencies).toEqual(['foo', 'bar']);
     });
   });
 });

packages/metro/src/node-haste/Module.js

@@ -19,7 +19,7 @@ const invariant = require('fbjs/lib/invariant');
 const isAbsolutePath = require('absolute-path');
 const jsonStableStringify = require('json-stable-stringify');
 
-const {join: joinPath, relative: relativePath, extname} = require('path');
+const {join: joinPath, relative: relativePath} = require('path');
 
 import type {
   TransformedCode,
@@ -44,10 +44,7 @@ export type ReadResult = {
   +source: string,
 };
 
-export type CachedReadResult = {|
+export type CachedReadResult = ?ReadResult;
-  +result: ?ReadResult,
-  +outdatedDependencies: $ReadOnlyArray<string>,
-|};
 
 export type TransformCode = (
   module: Module,
@@ -248,7 +245,7 @@ class Module {
    * To what we read from the cache or worker, we need to add id and source.
    */
   _finalizeReadResult(source: string, result: TransformedCode): ReadResult {
-    return {...result, id: this._getHasteName(), source};
+    return {...result, source};
   }
 
   async _transformCodeFor(
@@ -298,8 +295,9 @@ class Module {
   read(transformOptions: WorkerOptions): Promise<ReadResult> {
     return Promise.resolve().then(() => {
       const cached = this.readCached(transformOptions);
-      if (cached.result != null) {
+
-        return cached.result;
+      if (cached != null) {
+        return cached;
       }
       return this.readFresh(transformOptions);
     });
@@ -334,19 +332,11 @@ class Module {
       transformOptionsKey,
     );
     const cachedResult = this._options.transformCache.readSync(cacheProps);
-    if (cachedResult.result == null) {
+
-      return {
+    if (cachedResult == null) {
-        result: null,
+      return null;
-        outdatedDependencies: cachedResult.outdatedDependencies,
-      };
     }
-    return {
+    return this._finalizeReadResult(cacheProps.sourceCode, cachedResult);
-      result: this._finalizeReadResult(
-        cacheProps.sourceCode,
-        cachedResult.result,
-      ),
-      outdatedDependencies: [],
-    };
   }
 
   /**
@@ -368,10 +358,7 @@ class Module {
         cacheProps.sourceCode,
         freshResult,
       );
-      this._readResultsByOptionsKey.set(key, {
+      this._readResultsByOptionsKey.set(key, finalResult);
-        result: finalResult,
-        outdatedDependencies: [],
-      });
       return finalResult;
     })();
     this._readPromises.set(key, freshPromise);