diff --git a/packages/metro-bundler/index.js b/packages/metro-bundler/index.js
index 7d7ab760..cfae75fd 100644
--- a/packages/metro-bundler/index.js
+++ b/packages/metro-bundler/index.js
@@ -19,6 +19,7 @@ const invariant = require('fbjs/lib/invariant');
 import type {PostProcessModules, PostMinifyProcess} from './src/Bundler';
 import type Server from './src/Server';
 import type {GlobalTransformCache} from './src/lib/GlobalTransformCache';
+import type {TransformCache} from './src/lib/TransformCaching';
 import type {Reporter} from './src/lib/reporting';
 import type {HasteImpl} from './src/node-haste/Module';
 
@@ -34,6 +35,7 @@ type Options = {
   projectRoots: $ReadOnlyArray<string>,
   reporter?: Reporter,
   +sourceExts: ?Array<string>,
+  +transformCache: TransformCache,
   +transformModulePath: string,
   watch?: boolean,
 };
@@ -118,6 +120,7 @@ function createServer(options: StrictOptions): Server {
 
   // Some callsites may not be Flowified yet.
   invariant(options.reporter != null, 'createServer() requires reporter');
+  invariant(options.transformCache != null, 'createServer() requires transformCache');
   const serverOptions = Object.assign({}, options);
   delete serverOptions.verbose;
   const ServerClass = require('./src/Server');
diff --git a/packages/metro-bundler/src/Bundler/index.js b/packages/metro-bundler/src/Bundler/index.js
index 945d1c4e..4068b027 100644
--- a/packages/metro-bundler/src/Bundler/index.js
+++ b/packages/metro-bundler/src/Bundler/index.js
@@ -46,6 +46,7 @@ import type ResolutionResponse from '../node-haste/DependencyGraph/ResolutionRes
 import type {MappingsMap} from '../lib/SourceMap';
 import type {Options as JSTransformerOptions} from '../JSTransformer/worker/worker';
 import type {Reporter} from '../lib/reporting';
+import type {TransformCache} from '../lib/TransformCaching';
 import type {GlobalTransformCache} from '../lib/GlobalTransformCache';
 
 export type BundlingOptions = {|
@@ -132,6 +133,7 @@ type Options = {|
   +reporter: Reporter,
   +resetCache: boolean,
   +sourceExts: Array<string>,
+  +transformCache: TransformCache,
   +transformModulePath: string,
   +transformTimeoutInterval: ?number,
   +watch: boolean,
@@ -227,6 +229,7 @@ class Bundler {
           code,
           transformCodeOptions,
         ),
+      transformCache: opts.transformCache,
       watch: opts.watch,
     });
 
diff --git a/packages/metro-bundler/src/Resolver/index.js b/packages/metro-bundler/src/Resolver/index.js
index 1713a42e..b855d336 100644
--- a/packages/metro-bundler/src/Resolver/index.js
+++ b/packages/metro-bundler/src/Resolver/index.js
@@ -22,7 +22,7 @@ import type {MappingsMap} from '../lib/SourceMap';
 import type {PostMinifyProcess} from '../Bundler';
 import type {Options as JSTransformerOptions} from '../JSTransformer/worker/worker';
 import type {Reporter} from '../lib/reporting';
-import type {GetTransformCacheKey} from '../lib/TransformCache';
+import type {TransformCache, GetTransformCacheKey} from '../lib/TransformCaching';
 import type {GlobalTransformCache} from '../lib/GlobalTransformCache';
 
 type MinifyCode = (filePath: string, code: string, map: MappingsMap) =>
@@ -47,6 +47,7 @@ type Options = {|
   +reporter: Reporter,
   +resetCache: boolean,
   +sourceExts: Array<string>,
+  +transformCache: TransformCache,
   +transformCode: TransformCode,
   +watch: boolean,
 |};
@@ -76,6 +77,7 @@ class Resolver {
       moduleOptions: {
         hasteImpl: opts.hasteImpl,
         resetCache: opts.resetCache,
+        transformCache: opts.transformCache,
       },
       preferNativePlatform: true,
       roots: opts.projectRoots,
diff --git a/packages/metro-bundler/src/Server/index.js b/packages/metro-bundler/src/Server/index.js
index db2d10b8..7f20607d 100644
--- a/packages/metro-bundler/src/Server/index.js
+++ b/packages/metro-bundler/src/Server/index.js
@@ -33,6 +33,7 @@ import type Bundle from '../Bundler/Bundle';
 import type HMRBundle from '../Bundler/HMRBundle';
 import type {Reporter} from '../lib/reporting';
 import type {GetTransformOptions, PostProcessModules, PostMinifyProcess} from '../Bundler';
+import type {TransformCache} from '../lib/TransformCaching';
 import type {GlobalTransformCache} from '../lib/GlobalTransformCache';
 import type {SourceMap, Symbolicate} from './symbolicate';
 
@@ -75,6 +76,7 @@ type Options = {
   resetCache?: boolean,
   silent?: boolean,
   +sourceExts: ?Array<string>,
+  +transformCache: TransformCache,
   +transformModulePath: string,
   transformTimeoutInterval?: number,
   watch?: boolean,
@@ -131,6 +133,7 @@ class Server {
     resetCache: boolean,
     silent: boolean,
     +sourceExts: Array<string>,
+    +transformCache: TransformCache,
     +transformModulePath: string,
     transformTimeoutInterval: ?number,
     watch: boolean,
@@ -170,6 +173,7 @@ class Server {
       resetCache: options.resetCache || false,
       silent: options.silent || false,
       sourceExts: options.sourceExts || defaults.sourceExts,
+      transformCache: options.transformCache,
       transformModulePath: options.transformModulePath,
       transformTimeoutInterval: options.transformTimeoutInterval,
       watch: options.watch || false,
diff --git a/packages/metro-bundler/src/lib/GlobalTransformCache.js b/packages/metro-bundler/src/lib/GlobalTransformCache.js
index 11ff4591..4f8f6834 100644
--- a/packages/metro-bundler/src/lib/GlobalTransformCache.js
+++ b/packages/metro-bundler/src/lib/GlobalTransformCache.js
@@ -27,7 +27,7 @@ import type {
   TransformOptionsStrict,
 } from '../JSTransformer/worker/worker';
 import type {LocalPath} from '../node-haste/lib/toLocalPath';
-import type {CachedResult, GetTransformCacheKey} from './TransformCache';
+import type {CachedResult, GetTransformCacheKey} from './TransformCaching';
 
 /**
  * The API that a global transform cache must comply with. To implement a
diff --git a/packages/metro-bundler/src/lib/TransformCache.js b/packages/metro-bundler/src/lib/TransformCaching.js
similarity index 87%
rename from packages/metro-bundler/src/lib/TransformCache.js
rename to packages/metro-bundler/src/lib/TransformCaching.js
index 45b02d69..57eaaba5 100644
--- a/packages/metro-bundler/src/lib/TransformCache.js
+++ b/packages/metro-bundler/src/lib/TransformCaching.js
@@ -59,6 +59,23 @@ export type ReadTransformProps = {
   cacheOptions: CacheOptions,
 };
 
+type WriteTransformProps = {
+  filePath: string,
+  sourceCode: string,
+  getTransformCacheKey: GetTransformCacheKey,
+  transformOptions: WorkerOptions,
+  transformOptionsKey: string,
+  result: CachedResult,
+};
+
+/**
+ * The API that should be exposed for a transform cache.
+ */
+export type TransformCache = {
+  writeSync(props: WriteTransformProps): void,
+  readSync(props: ReadTransformProps): TransformCacheResult,
+};
+
 const EMPTY_ARRAY = [];
 
 /* 1 day */
@@ -66,7 +83,7 @@ const GARBAGE_COLLECTION_PERIOD = 24 * 60 * 60 * 1000;
 /* 4 days */
 const CACHE_FILE_MAX_LAST_ACCESS_TIME = GARBAGE_COLLECTION_PERIOD * 4;
 
-class TransformCache {
+class FileBasedCache {
   _cacheWasReset: boolean;
   _lastCollected: ?number;
   _rootPath: string;
@@ -398,4 +415,40 @@ function unlinkIfExistsSync(filePath: string) {
   }
 }
 
-module.exports = TransformCache;
+/**
+ * In some context we want to build from scratch, that is what this cache
+ * implementation allows.
+ */
+function none(): TransformCache {
+  return {
+    writeSync: () => {},
+    readSync: () => ({
+      result: null,
+      outdatedDependencies: [],
+    }),
+  };
+}
+
+/**
+ * If packager is running for two different directories, we don't want the
+ * caches to conflict with each other. `__dirname` carries that because
+ * packager will be, for example, installed in a different `node_modules/`
+ * folder for different projects.
+ */
+function useTempDir(): TransformCache {
+  const hash = crypto.createHash('sha1').update(__dirname);
+  if (process.getuid != null) {
+    hash.update(process.getuid().toString());
+  }
+  const tmpDir = require('os').tmpdir();
+  const cacheName = 'react-native-packager-cache';
+  const rootPath = path.join(tmpDir, cacheName + '-' + hash.digest('hex'));
+  return new FileBasedCache(rootPath);
+}
+
+function useProjectDir(projectPath: string): TransformCache {
+  invariant(path.isAbsolute(projectPath), 'project path must be absolute');
+  return new FileBasedCache(path.join(projectPath, '.metro-bundler'));
+}
+
+module.exports = {FileBasedCache, none, useTempDir, useProjectDir};
diff --git a/packages/metro-bundler/src/lib/__mocks__/TransformCache.js b/packages/metro-bundler/src/lib/__mocks__/TransformCaching.js
similarity index 95%
rename from packages/metro-bundler/src/lib/__mocks__/TransformCache.js
rename to packages/metro-bundler/src/lib/__mocks__/TransformCaching.js
index 288e330a..0fd89826 100644
--- a/packages/metro-bundler/src/lib/__mocks__/TransformCache.js
+++ b/packages/metro-bundler/src/lib/__mocks__/TransformCaching.js
@@ -44,4 +44,4 @@ class TransformCacheMock {
 
 }
 
-module.exports = TransformCacheMock;
+module.exports = {mocked: () => new TransformCacheMock()};
diff --git a/packages/metro-bundler/src/lib/__tests__/TransformCache-test.js b/packages/metro-bundler/src/lib/__tests__/TransformCaching-test.js
similarity index 95%
rename from packages/metro-bundler/src/lib/__tests__/TransformCache-test.js
rename to packages/metro-bundler/src/lib/__tests__/TransformCaching-test.js
index 06c81592..d1604e85 100644
--- a/packages/metro-bundler/src/lib/__tests__/TransformCache-test.js
+++ b/packages/metro-bundler/src/lib/__tests__/TransformCaching-test.js
@@ -11,7 +11,7 @@
 
 jest
   .dontMock('json-stable-stringify')
-  .dontMock('../TransformCache')
+  .dontMock('../TransformCaching')
   .dontMock('left-pad')
   .dontMock('lodash/throttle')
   .dontMock('crypto');
@@ -48,14 +48,14 @@ function cartesianProductOf(a1, a2) {
   return product;
 }
 
-describe('TransformCache', () => {
+describe('TransformCaching.FileBasedCache', () => {
 
   let transformCache;
 
   beforeEach(() => {
     jest.resetModules();
     mockFS.clear();
-    transformCache = new (require('../TransformCache'))('/cache');
+    transformCache = new (require('../TransformCaching').FileBasedCache)('/cache');
   });
 
   it('is caching different files and options separately', () => {
diff --git a/packages/metro-bundler/src/node-haste/DependencyGraph.js b/packages/metro-bundler/src/node-haste/DependencyGraph.js
index 713649a0..3205187d 100644
--- a/packages/metro-bundler/src/node-haste/DependencyGraph.js
+++ b/packages/metro-bundler/src/node-haste/DependencyGraph.js
@@ -39,7 +39,7 @@ import type {
   Options as JSTransformerOptions,
 } from '../JSTransformer/worker/worker';
 import type {GlobalTransformCache} from '../lib/GlobalTransformCache';
-import type {GetTransformCacheKey} from '../lib/TransformCache';
+import type {GetTransformCacheKey} from '../lib/TransformCaching';
 import type {Reporter} from '../lib/reporting';
 import type {ModuleMap} from './DependencyGraph/ResolutionRequest';
 import type {Options as ModuleOptions, TransformCode} from './Module';
diff --git a/packages/metro-bundler/src/node-haste/Module.js b/packages/metro-bundler/src/node-haste/Module.js
index 26dbdb44..17269be8 100644
--- a/packages/metro-bundler/src/node-haste/Module.js
+++ b/packages/metro-bundler/src/node-haste/Module.js
@@ -12,8 +12,6 @@
 
 'use strict';
 
-const TransformCache = require('../lib/TransformCache');
-
 const crypto = require('crypto');
 const docblock = require('./DependencyGraph/docblock');
 const fs = require('fs');
@@ -30,8 +28,11 @@ import type {
 } from '../JSTransformer/worker/worker';
 import type {GlobalTransformCache} from '../lib/GlobalTransformCache';
 import type {MappingsMap} from '../lib/SourceMap';
-import type {GetTransformCacheKey} from '../lib/TransformCache';
-import type {ReadTransformProps} from '../lib/TransformCache';
+import type {
+  TransformCache,
+  GetTransformCacheKey,
+  ReadTransformProps,
+} from '../lib/TransformCaching';
 import type {Reporter} from '../lib/reporting';
 import type DependencyGraphHelpers
   from './DependencyGraph/DependencyGraphHelpers';
@@ -70,17 +71,18 @@ export type HasteImpl = {
 export type Options = {
   hasteImpl?: HasteImpl,
   resetCache?: boolean,
+  transformCache: TransformCache,
 };
 
 export type ConstructorArgs = {
   depGraphHelpers: DependencyGraphHelpers,
-  globalTransformCache: ?GlobalTransformCache,
   file: string,
+  getTransformCacheKey: GetTransformCacheKey,
+  globalTransformCache: ?GlobalTransformCache,
   localPath: LocalPath,
   moduleCache: ModuleCache,
   options: Options,
   reporter: Reporter,
-  getTransformCacheKey: GetTransformCacheKey,
   transformCode: ?TransformCode,
 };
 
@@ -334,7 +336,7 @@ class Module {
         return;
       }
       invariant(result != null, 'missing result');
-      Module._getTransformCache().writeSync({...cacheProps, result});
+      this._options.transformCache.writeSync({...cacheProps, result});
       callback(undefined, result);
     });
   }
@@ -381,7 +383,7 @@ class Module {
       transformOptions,
       transformOptionsKey,
     );
-    const cachedResult = Module._getTransformCache().readSync(cacheProps);
+    const cachedResult = this._options.transformCache.readSync(cacheProps);
     if (cachedResult.result == null) {
       return {
         result: null,
@@ -469,27 +471,6 @@ class Module {
   isPolyfill() {
     return false;
   }
-
-  /**
-   * If packager is running for two different directories, we don't want the
-   * caches to conflict with each other. `__dirname` carries that because
-   * packager will be, for example, installed in a different `node_modules/`
-   * folder for different projects.
-   */
-  static _getTransformCache(): TransformCache {
-    if (this._transformCache != null) {
-      return this._transformCache;
-    }
-    const hash = crypto.createHash('sha1').update(__dirname);
-    if (process.getuid != null) {
-      hash.update(process.getuid().toString());
-    }
-    const tmpDir = require('os').tmpdir();
-    const cacheName = 'react-native-packager-cache';
-    const rootPath = path.join(tmpDir, cacheName + '-' + hash.digest('hex'));
-    this._transformCache = new TransformCache(rootPath);
-    return this._transformCache;
-  }
 }
 
 // use weak map to speed up hash creation of known objects
diff --git a/packages/metro-bundler/src/node-haste/ModuleCache.js b/packages/metro-bundler/src/node-haste/ModuleCache.js
index bdc7c1b3..7d94509e 100644
--- a/packages/metro-bundler/src/node-haste/ModuleCache.js
+++ b/packages/metro-bundler/src/node-haste/ModuleCache.js
@@ -20,7 +20,7 @@ const Polyfill = require('./Polyfill');
 const toLocalPath = require('./lib/toLocalPath');
 
 import type {GlobalTransformCache} from '../lib/GlobalTransformCache';
-import type {GetTransformCacheKey} from '../lib/TransformCache';
+import type {GetTransformCacheKey} from '../lib/TransformCaching';
 import type {Reporter} from '../lib/reporting';
 import type DependencyGraphHelpers
   from './DependencyGraph/DependencyGraphHelpers';
@@ -112,8 +112,8 @@ class ModuleCache {
        */
       this._moduleCache[filePath] = new AssetModule(
         {
-          dependencies: this._assetDependencies,
           depGraphHelpers: this._depGraphHelpers,
+          dependencies: this._assetDependencies,
           file: filePath,
           getTransformCacheKey: this._getTransformCacheKey,
           globalTransformCache: null,
@@ -161,11 +161,12 @@ class ModuleCache {
   createPolyfill({file}: {file: string}) {
     /* $FlowFixMe: there are missing arguments. */
     return new Polyfill({
-      file,
       depGraphHelpers: this._depGraphHelpers,
+      file,
       getTransformCacheKey: this._getTransformCacheKey,
       localPath: toLocalPath(this._roots, file),
       moduleCache: this,
+      options: this._moduleOptions,
       transformCode: this._transformCode,
     });
   }
diff --git a/packages/metro-bundler/src/node-haste/__tests__/DependencyGraph-test.js b/packages/metro-bundler/src/node-haste/__tests__/DependencyGraph-test.js
index d8a6d139..968f99a7 100644
--- a/packages/metro-bundler/src/node-haste/__tests__/DependencyGraph-test.js
+++ b/packages/metro-bundler/src/node-haste/__tests__/DependencyGraph-test.js
@@ -15,7 +15,7 @@ jest.useRealTimers();
 jest
   .mock('fs')
   .mock('../../Logger')
-  .mock('../../lib/TransformCache')
+  .mock('../../lib/TransformCaching')
   // It's noticeably faster to prevent running watchman from FileWatcher.
   .mock('child_process', () => ({}));
 
@@ -96,7 +96,7 @@ describe('DependencyGraph', function() {
       useWatchman: false,
       ignoreFilePath: () => false,
       maxWorkerCount: 1,
-      moduleOptions: {},
+      moduleOptions: {transformCache: require('TransformCaching').mocked()},
       resetCache: true,
       transformCode: (module, sourceCode, transformOptions) => {
         return new Promise(resolve => {
diff --git a/packages/metro-bundler/src/node-haste/__tests__/Module-test.js b/packages/metro-bundler/src/node-haste/__tests__/Module-test.js
index 111e86d3..1c92071d 100644
--- a/packages/metro-bundler/src/node-haste/__tests__/Module-test.js
+++ b/packages/metro-bundler/src/node-haste/__tests__/Module-test.js
@@ -21,7 +21,7 @@ jest
 const Module = require('../Module');
 const ModuleCache = require('../ModuleCache');
 const DependencyGraphHelpers = require('../DependencyGraph/DependencyGraphHelpers');
-const TransformCache = require('../../lib/TransformCache');
+const TransformCaching = require('../../lib/TransformCaching');
 const fs = require('graceful-fs');
 
 const packageJson =
@@ -31,8 +31,6 @@ const packageJson =
     description: "A require('foo') story",
   });
 
-const TRANSFORM_CACHE = new TransformCache();
-
 function mockFS(rootChildren) {
   fs.__setMockFilesystem({root: rootChildren});
 }
@@ -49,6 +47,7 @@ describe('Module', () => {
   const fileName = '/root/index.js';
 
   let cache;
+  const transformCache = TransformCaching.mocked();
 
   const createCache = () => ({
     get: jest.genMockFn().mockImplementation(
@@ -61,7 +60,7 @@ describe('Module', () => {
   let transformCacheKey;
   const createModule = options =>
     new Module({
-      options: {},
+      options: {transformCache},
       transformCode: (module, sourceCode, transformOptions) => {
         return Promise.resolve({code: sourceCode});
       },
@@ -80,7 +79,7 @@ describe('Module', () => {
     process.platform = 'linux';
     cache = createCache();
     transformCacheKey = 'abcdef';
-    TRANSFORM_CACHE.mock.reset();
+    transformCache.mock.reset();
   });
 
   describe('Module ID', () => {
@@ -183,7 +182,7 @@ describe('Module', () => {
       transformResult = {code: ''};
       transformCode = jest.genMockFn()
         .mockImplementation((module, sourceCode, options) => {
-          TRANSFORM_CACHE.writeSync({
+          transformCache.writeSync({
             filePath: module.path,
             sourceCode,
             transformOptions: options,
@@ -257,23 +256,6 @@ describe('Module', () => {
       });
     });
 
-    it('stores all things if options is undefined', () => {
-      transformResult = {
-        code: exampleCode,
-        arbitrary: 'arbitrary',
-        dependencies: ['foo', 'bar'],
-        dependencyOffsets: [12, 764],
-        id: null,
-        map: {version: 3},
-        subObject: {foo: 'bar'},
-      };
-      const module = createModule({transformCode, options: undefined});
-
-      return module.read().then(result => {
-        expect(result).toEqual({...transformResult, source: 'arbitrary(code);'});
-      });
-    });
-
     it('exposes the transformed code rather than the raw file contents', () => {
       transformResult = {code: exampleCode};
       const module = createModule({transformCode});