diff --git a/packager/src/Resolver/__tests__/Resolver-test.js b/packager/src/Resolver/__tests__/Resolver-test.js
index 33205179d..ca294f09b 100644
--- a/packager/src/Resolver/__tests__/Resolver-test.js
+++ b/packager/src/Resolver/__tests__/Resolver-test.js
@@ -113,7 +113,7 @@ describe('Resolver', function() {
         platforms: ['ios', 'windows', 'vr'],
       });
       const platforms = DependencyGraph.mock.calls[0][0].platforms;
-      expect(platforms).toEqual(['ios', 'windows', 'vr']);
+      expect(Array.from(platforms)).toEqual(['ios', 'windows', 'vr']);
     });
 
     it('should get dependencies with polyfills', function() {
diff --git a/packager/src/Resolver/index.js b/packager/src/Resolver/index.js
index eb8432e4e..36f85f962 100644
--- a/packager/src/Resolver/index.js
+++ b/packager/src/Resolver/index.js
@@ -59,23 +59,27 @@ class Resolver {
       assetExts: opts.assetExts,
       cache: opts.cache,
       extraNodeModules: opts.extraNodeModules,
+      extensions: ['js', 'json'],
+      forceNodeFilesystemAPI: false,
       getTransformCacheKey: opts.getTransformCacheKey,
       globalTransformCache: opts.globalTransformCache,
       ignoreFilePath: function(filepath) {
         return filepath.indexOf('__tests__') !== -1 ||
           (opts.blacklistRE != null && opts.blacklistRE.test(filepath));
       },
+      maxWorkers: null,
       moduleOptions: {
         cacheTransformResults: true,
         resetCache: opts.resetCache,
       },
-      platforms: opts.platforms,
+      platforms: new Set(opts.platforms),
       preferNativePlatform: true,
       providesModuleNodeModules: opts.providesModuleNodeModules || defaults.providesModuleNodeModules,
       reporter: opts.reporter,
       resetCache: opts.resetCache,
       roots: opts.projectRoots,
       transformCode: opts.transformCode,
+      useWatchman: true,
       watch: opts.watch || false,
     });
 
diff --git a/packager/src/node-haste/__tests__/DependencyGraph-test.js b/packager/src/node-haste/__tests__/DependencyGraph-test.js
index b87c0600f..a1318d828 100644
--- a/packager/src/node-haste/__tests__/DependencyGraph-test.js
+++ b/packager/src/node-haste/__tests__/DependencyGraph-test.js
@@ -106,15 +106,18 @@ describe('DependencyGraph', function() {
     defaults = {
       assetExts: ['png', 'jpg'],
       cache: new Cache(),
+      extensions: ['js', 'json'],
       forceNodeFilesystemAPI: true,
       providesModuleNodeModules: [
         'haste-fbjs',
         'react-haste',
         'react-native',
       ],
-      platforms: ['ios', 'android'],
+      platforms: new Set(['ios', 'android']),
       useWatchman: false,
+      ignoreFilePath: () => false,
       maxWorkers: 1,
+      moduleOptions: {cacheTransformResults: true},
       resetCache: true,
       transformCode: (module, sourceCode, transformOptions) => {
         return new Promise(resolve => {
@@ -127,6 +130,7 @@ describe('DependencyGraph', function() {
       },
       getTransformCacheKey: () => 'abcdef',
       reporter: require('../../lib/reporting').nullReporter,
+      watch: false,
     };
   });
 
@@ -3423,7 +3427,7 @@ describe('DependencyGraph', function() {
 
       var dgraph = new DependencyGraph({
         ...defaults,
-        platforms: ['ios', 'android', 'web'],
+        platforms: new Set(['ios', 'android', 'web']),
         roots: [root],
       });
       return getOrderedDependenciesAsJSON(dgraph, '/root/index.ios.js').then(function(deps) {
diff --git a/packager/src/node-haste/index.js b/packager/src/node-haste/index.js
index 995a64989..0357f7b46 100644
--- a/packager/src/node-haste/index.js
+++ b/packager/src/node-haste/index.js
@@ -49,114 +49,42 @@ import type {HasteFS} from './types';
 
 const ERROR_BUILDING_DEP_GRAPH = 'DependencyGraphError';
 
+type Options = {
+  assetDependencies: Array<string>,
+  assetExts: Array<string>,
+  cache: Cache,
+  extensions: Array<string>,
+  extraNodeModules: ?Object,
+  forceNodeFilesystemAPI: boolean,
+  getTransformCacheKey: GetTransformCacheKey,
+  globalTransformCache: ?GlobalTransformCache,
+  ignoreFilePath: (filePath: string) => boolean,
+  maxWorkers: ?number,
+  moduleOptions: ModuleOptions,
+  platforms: Set<string>,
+  preferNativePlatform: boolean,
+  providesModuleNodeModules: Array<string>,
+  reporter: Reporter,
+  resetCache: boolean,
+  roots: Array<string>,
+  transformCode: TransformCode,
+  useWatchman: boolean,
+  watch: boolean,
+};
+
 class DependencyGraph {
-  _opts: {|
-    assetExts: Array<string>,
-    extensions: Array<string>,
-    extraNodeModules: ?Object,
-    forceNodeFilesystemAPI: boolean,
-    globalTransformCache: ?GlobalTransformCache,
-    ignoreFilePath: (filePath: string) => boolean,
-    maxWorkers: ?number,
-    mocksPattern: mixed,
-    moduleOptions: ModuleOptions,
-    platforms: Set<string>,
-    preferNativePlatform: boolean,
-    providesModuleNodeModules: Array<string>,
-    resetCache: boolean,
-    roots: Array<string>,
-    shouldThrowOnUnresolvedErrors: () => boolean,
-    getTransformCacheKey: GetTransformCacheKey,
-    transformCode: TransformCode,
-    useWatchman: boolean,
-    watch: boolean,
-  |};
-  _assetDependencies: Array<string>;
-  _cache: Cache;
+  _opts: Options;
   _haste: JestHasteMap;
   _hasteFS: HasteFS;
   _hasteMap: HasteMap;
   _hasteMapError: ?Error;
   _helpers: DependencyGraphHelpers;
   _moduleCache: ModuleCache;
-  _reporter: Reporter;
 
   _loading: Promise<mixed>;
 
-  constructor({
-    assetDependencies,
-    assetExts,
-    cache,
-    extensions,
-    extraNodeModules,
-    forceNodeFilesystemAPI,
-    getTransformCacheKey,
-    globalTransformCache,
-    ignoreFilePath,
-    maxWorkers,
-    mocksPattern,
-    moduleOptions,
-    platforms,
-    preferNativePlatform,
-    providesModuleNodeModules,
-    resetCache,
-    roots,
-    shouldThrowOnUnresolvedErrors = () => true,
-    transformCode,
-    useWatchman,
-    watch,
-    reporter,
-  }: {
-    assetDependencies: Array<string>,
-    assetExts: Array<string>,
-    cache: Cache,
-    extensions?: ?Array<string>,
-    extraNodeModules: ?Object,
-    forceNodeFilesystemAPI?: boolean,
-    getTransformCacheKey: GetTransformCacheKey,
-    globalTransformCache: ?GlobalTransformCache,
-    ignoreFilePath: (filePath: string) => boolean,
-    maxWorkers?: ?number,
-    mocksPattern?: mixed,
-    moduleOptions: ?ModuleOptions,
-    platforms: Array<string>,
-    preferNativePlatform: boolean,
-    providesModuleNodeModules: Array<string>,
-    resetCache: boolean,
-    roots: Array<string>,
-    shouldThrowOnUnresolvedErrors?: () => boolean,
-    transformCode: TransformCode,
-    useWatchman?: ?boolean,
-    watch: boolean,
-    reporter: Reporter,
-  }) {
-    this._opts = {
-      assetExts: assetExts || [],
-      extensions: extensions || ['js', 'json'],
-      extraNodeModules,
-      forceNodeFilesystemAPI: !!forceNodeFilesystemAPI,
-      getTransformCacheKey,
-      globalTransformCache,
-      ignoreFilePath: ignoreFilePath || (() => {}),
-      maxWorkers,
-      mocksPattern,
-      moduleOptions: moduleOptions || {
-        cacheTransformResults: true,
-      },
-      platforms: new Set(platforms || []),
-      preferNativePlatform: preferNativePlatform || false,
-      providesModuleNodeModules,
-      resetCache,
-      roots,
-      shouldThrowOnUnresolvedErrors,
-      transformCode,
-      useWatchman: useWatchman !== false,
-      watch: !!watch,
-    };
-
-    this._reporter = reporter;
-    this._cache = cache;
-    this._assetDependencies = assetDependencies;
+  constructor(opts: Options) {
+    this._opts = {...opts};
     this._helpers = new DependencyGraphHelpers(this._opts);
     this.load();
   }
@@ -185,20 +113,20 @@ class DependencyGraph {
 
     const initializingPackagerLogEntry =
       log(createActionStartEntry('Initializing Packager'));
-    this._reporter.update({type: 'dep_graph_loading'});
+    this._opts.reporter.update({type: 'dep_graph_loading'});
     this._loading = this._haste.build().then(({hasteFS}) => {
       this._hasteFS = hasteFS;
       const hasteFSFiles = hasteFS.getAllFiles();
 
       this._moduleCache = new ModuleCache({
-        cache: this._cache,
+        cache: this._opts.cache,
         getTransformCacheKey: this._opts.getTransformCacheKey,
         globalTransformCache: this._opts.globalTransformCache,
         transformCode: this._opts.transformCode,
         depGraphHelpers: this._helpers,
-        assetDependencies: this._assetDependencies,
+        assetDependencies: this._opts.assetDependencies,
         moduleOptions: this._opts.moduleOptions,
-        reporter: this._reporter,
+        reporter: this._opts.reporter,
         getClosestPackage: filePath => {
           let {dir, root} = path.parse(filePath);
           do {
@@ -235,7 +163,7 @@ class DependencyGraph {
         map => {
           log(createActionEndEntry(buildingHasteMapLogEntry));
           log(createActionEndEntry(initializingPackagerLogEntry));
-          this._reporter.update({type: 'dep_graph_loaded'});
+          this._opts.reporter.update({type: 'dep_graph_loaded'});
           return map;
         },
         err => {