diff --git a/packages/metro/src/JSTransformer/worker/__tests__/worker-test.js b/packages/metro/src/JSTransformer/worker/__tests__/worker-test.js
index d1a4caae..696ec83d 100644
--- a/packages/metro/src/JSTransformer/worker/__tests__/worker-test.js
+++ b/packages/metro/src/JSTransformer/worker/__tests__/worker-test.js
@@ -30,7 +30,7 @@ describe('code transformation worker:', () => {
       'arbitrary/file.js',
       `local/file.js`,
       'someReallyArbitrary(code)',
-      require.resolve('metro/src/transformer.js'),
+      path.join(__dirname, '../../../transformer.js'),
       true,
       {
         dev: true,
@@ -59,7 +59,7 @@ describe('code transformation worker:', () => {
       'arbitrary/file.js',
       `local/file.js`,
       'arbitrary(code)',
-      require.resolve('metro/src/transformer.js'),
+      path.join(__dirname, '../../../transformer.js'),
       false,
       {
         dev: true,
@@ -94,7 +94,7 @@ describe('code transformation worker:', () => {
         'const b = require("b");',
         'import c from "./c";',
       ].join('\n'),
-      require.resolve('metro/src/transformer.js'),
+      path.join(__dirname, '../../../transformer.js'),
       false,
       {
         dev: true,
diff --git a/packages/metro/src/lib/__tests__/getTransformCacheKeyFn-test.js b/packages/metro/src/lib/__tests__/getTransformCacheKeyFn-test.js
index 83a8e8d7..609319df 100644
--- a/packages/metro/src/lib/__tests__/getTransformCacheKeyFn-test.js
+++ b/packages/metro/src/lib/__tests__/getTransformCacheKeyFn-test.js
@@ -16,6 +16,7 @@ jest.mock('../../../package.json', () => ({
 }));
 
 const getTransformCacheKeyFn = require('../getTransformCacheKeyFn');
+const path = require('path');
 
 describe('getTransformCacheKeyFn', () => {
   it('Should return always the same key for the same params', async () => {
@@ -25,7 +26,10 @@ describe('getTransformCacheKeyFn', () => {
         cacheVersion: '1.0',
         dynamicDepsInPackages: 'arbitrary',
         projectRoots: [__dirname],
-        transformModulePath: require.resolve('metro/src/defaultTransform.js'),
+        transformModulePath: path.resolve(
+          __dirname,
+          '../../defaultTransform.js',
+        ),
       })(),
     ).toMatchSnapshot();
   });
@@ -36,7 +40,7 @@ describe('getTransformCacheKeyFn', () => {
       cacheVersion: '1.0',
       dynamicDepsInPackages: 'arbitrary',
       projectRoots: [__dirname],
-      transformModulePath: require.resolve('metro/src/defaultTransform.js'),
+      transformModulePath: path.resolve(__dirname, '../../defaultTransform.js'),
     };
 
     const changedParams = [
@@ -50,7 +54,10 @@ describe('getTransformCacheKeyFn', () => {
       },
       {
         ...baseParams,
-        transformModulePath: require.resolve('metro/src/transformer.js'),
+        transformModulePath: path.resolve(
+          __dirname,
+          '../../../src/transformer.js',
+        ),
       },
     ];
 
diff --git a/packages/metro/src/lib/getPreludeCode.js b/packages/metro/src/lib/getPreludeCode.js
index 75d71da5..2b5e712f 100644
--- a/packages/metro/src/lib/getPreludeCode.js
+++ b/packages/metro/src/lib/getPreludeCode.js
@@ -29,7 +29,7 @@ function getPreludeCode({
 }
 
 function formatExtraVars(extraVars) {
-  const assignments = [];
+  let assignments = [];
   for (const key in extraVars) {
     assignments.push(`${key}=${JSON.stringify(extraVars[key])}`);
   }
diff --git a/packages/metro/src/transformer.js b/packages/metro/src/transformer.js
index cdc52af3..2a09f2de 100644
--- a/packages/metro/src/transformer.js
+++ b/packages/metro/src/transformer.js
@@ -60,7 +60,7 @@ const getBabelRC = (function() {
     // use the Babel config provided with react-native.
     if (!projectBabelRCPath || !fs.existsSync(projectBabelRCPath)) {
       babelRC = json5.parse(
-        fs.readFileSync(require.resolve('metro/rn-babelrc.json')),
+        fs.readFileSync(path.resolve(__dirname, '..', 'rn-babelrc.json')),
       );
 
       // Require the babel-preset's listed in the default babel config