diff --git a/packages/metro-bundler/src/Bundler/index.js b/packages/metro-bundler/src/Bundler/index.js
index cce95a30..126c3e79 100644
--- a/packages/metro-bundler/src/Bundler/index.js
+++ b/packages/metro-bundler/src/Bundler/index.js
@@ -23,7 +23,6 @@ const HMRBundle = require('./HMRBundle');
 const ModuleTransport = require('../lib/ModuleTransport');
 const imageSize = require('image-size');
 const path = require('path');
-const version = require('../../../package.json').version;
 const denodeify = require('denodeify');
 
 const {
@@ -34,6 +33,8 @@ const {
   extname,
 } = require('path');
 
+const VERSION = require('../../package.json').version;
+
 import type AssetServer from '../AssetServer';
 import type Module from '../node-haste/Module';
 import type ResolutionResponse from '../node-haste/DependencyGraph/ResolutionResponse';
@@ -129,7 +130,7 @@ class Bundler {
 
     const cacheKeyParts =  [
       'react-packager-cache',
-      version,
+      VERSION,
       opts.cacheVersion,
       stableProjectRoots.join(',').split(pathSeparator).join('-'),
       transformModuleHash,
diff --git a/packages/metro-bundler/src/Logger/index.js b/packages/metro-bundler/src/Logger/index.js
index cb7ea774..db53a1fc 100644
--- a/packages/metro-bundler/src/Logger/index.js
+++ b/packages/metro-bundler/src/Logger/index.js
@@ -12,10 +12,11 @@
 'use strict';
 
 const os = require('os');
-const pkgjson = require('../../../package.json');
 
 const {EventEmitter} = require('events');
 
+const VERSION = require('../../package.json').version;
+
 import type {
   ActionLogEntryData,
   ActionStartLogEntry,
@@ -35,7 +36,7 @@ function createEntry(data: LogEntry | string): LogEntry {
   return {
     ...logEntry,
     log_session,
-    packager_version: pkgjson.version,
+    packager_version: VERSION,
   };
 }
 
diff --git a/packages/metro-bundler/src/ModuleGraph/node-haste/Package.js b/packages/metro-bundler/src/ModuleGraph/node-haste/Package.js
index ad328d7a..9e982e14 100644
--- a/packages/metro-bundler/src/ModuleGraph/node-haste/Package.js
+++ b/packages/metro-bundler/src/ModuleGraph/node-haste/Package.js
@@ -11,6 +11,7 @@
 
 'use strict';
 
+const nullthrows = require('fbjs/lib/nullthrows');
 const path = require('path');
 
 import type {PackageData} from '../types.flow';
@@ -51,7 +52,7 @@ module.exports = class Package {
   }
 
   getName() {
-    return this.data.then(p => p.name);
+    return this.data.then(p => nullthrows(p.name));
   }
 
   isHaste() {
diff --git a/packages/metro-bundler/src/Resolver/polyfills/require.js b/packages/metro-bundler/src/Resolver/polyfills/require.js
index acdc4a98..447a47af 100644
--- a/packages/metro-bundler/src/Resolver/polyfills/require.js
+++ b/packages/metro-bundler/src/Resolver/polyfills/require.js
@@ -10,7 +10,9 @@
  * @flow
  */
 
-'use strict';
+ 'use strict';
+
+declare var __DEV__: boolean;
 
 type DependencyMap = Array<ModuleID>;
 type Exports = any;
diff --git a/packages/metro-bundler/src/node-haste/Cache/index.js b/packages/metro-bundler/src/node-haste/Cache/index.js
index fb2a2289..64a7387d 100644
--- a/packages/metro-bundler/src/node-haste/Cache/index.js
+++ b/packages/metro-bundler/src/node-haste/Cache/index.js
@@ -236,7 +236,7 @@ function loadCacheSync(cachePath) {
   }
 
   try {
-    return JSON.parse(fs.readFileSync(cachePath));
+    return JSON.parse(fs.readFileSync(cachePath, 'utf8'));
   } catch (e) {
     if (e instanceof SyntaxError) {
       console.warn('Unable to parse cache file. Will clear and continue.');