diff --git a/packages/metro/src/JSTransformer/worker.js b/packages/metro/src/JSTransformer/worker.js
index b4feee98..b6f2d05c 100644
--- a/packages/metro/src/JSTransformer/worker.js
+++ b/packages/metro/src/JSTransformer/worker.js
@@ -37,13 +37,12 @@ import type {Ast} from '@babel/core';
 import type {Plugins as BabelPlugins} from 'babel-core';
 import type {LogEntry} from 'metro-core/src/Logger';
 import type {MetroSourceMapSegmentTuple} from 'metro-source-map';
+import type {TransformOutput} from '../DeltaBundler/traverseDependencies';
 
-export type TransformedCode = {
-  code: string,
+export type TransformedCode = {|
+  output: TransformOutput,
   dependencies: $ReadOnlyArray<TransformResultDependency>,
-  map: Array<MetroSourceMapSegmentTuple>,
-  type: string,
-};
+|};
 
 export type TransformArgs<ExtraOptions: {}> = {|
   filename: string,
@@ -173,7 +172,7 @@ async function transformCode(
     }
 
     return {
-      result: {dependencies: [], code, map, type},
+      result: {dependencies: [], output: [{data: {code, map}, type}]},
       sha1,
       transformFileStartLogEntry,
       transformFileEndLogEntry,
@@ -289,7 +288,7 @@ async function transformCode(
   }
 
   return {
-    result: {dependencies, code, map, type},
+    result: {dependencies, output: [{data: {code, map}, type}]},
     sha1,
     transformFileStartLogEntry,
     transformFileEndLogEntry,
diff --git a/packages/metro/src/JSTransformer/worker/__tests__/worker-test.js b/packages/metro/src/JSTransformer/worker/__tests__/worker-test.js
index d1a4caae..3c81636f 100644
--- a/packages/metro/src/JSTransformer/worker/__tests__/worker-test.js
+++ b/packages/metro/src/JSTransformer/worker/__tests__/worker-test.js
@@ -43,14 +43,15 @@ describe('code transformation worker:', () => {
       'reject',
     );
 
-    expect(result.code).toBe(
+    expect(result.output[0].type).toBe('js/script');
+    expect(result.output[0].data.code).toBe(
       [
         '(function (global) {',
         '  someReallyArbitrary(code);',
         '})(this);',
       ].join('\n'),
     );
-    expect(result.map).toHaveLength(3);
+    expect(result.output[0].data.map).toHaveLength(3);
     expect(result.dependencies).toEqual([]);
   });
 
@@ -72,14 +73,15 @@ describe('code transformation worker:', () => {
       'reject',
     );
 
-    expect(result.code).toBe(
+    expect(result.output[0].type).toBe('js/module');
+    expect(result.output[0].data.code).toBe(
       [
         '__d(function (global, _$$_REQUIRE, module, exports, _dependencyMap) {',
         '  arbitrary(code);',
         '});',
       ].join('\n'),
     );
-    expect(result.map).toHaveLength(3);
+    expect(result.output[0].data.map).toHaveLength(3);
     expect(result.dependencies).toEqual([]);
   });
 
@@ -107,7 +109,8 @@ describe('code transformation worker:', () => {
       'reject',
     );
 
-    expect(result.code).toBe(
+    expect(result.output[0].type).toBe('js/module');
+    expect(result.output[0].data.code).toBe(
       [
         '__d(function (global, _$$_REQUIRE, module, exports, _dependencyMap) {',
         "  'use strict';",
@@ -122,7 +125,7 @@ describe('code transformation worker:', () => {
         '});',
       ].join('\n'),
     );
-    expect(result.map).toHaveLength(14);
+    expect(result.output[0].data.map).toHaveLength(14);
     expect(result.dependencies).toEqual([
       {isAsync: false, name: './c'},
       {isAsync: false, name: './a'},
@@ -200,7 +203,7 @@ describe('code transformation worker:', () => {
         'minifyModulePath',
         'asyncRequire',
         'throwAtRuntime',
-      )).result.code,
+      )).result.output[0].data.code,
     ).toBe(
       [
         '__d(function (global, _$$_REQUIRE, module, exports, _dependencyMap) {',
@@ -229,7 +232,7 @@ describe('code transformation worker:', () => {
         'minifyModulePath',
         'asyncRequire',
         'throwAtRuntime',
-      )).result.code,
+      )).result.output[0].data.code,
     ).toBe(
       [
         '__d(function(global, require, module, exports) {',
diff --git a/packages/metro/src/lib/transformHelpers.js b/packages/metro/src/lib/transformHelpers.js
index a04cbd28..02351d19 100644
--- a/packages/metro/src/lib/transformHelpers.js
+++ b/packages/metro/src/lib/transformHelpers.js
@@ -113,15 +113,7 @@ async function getTransformFn(
       getSource() {
         return result.source;
       },
-      output: [
-        {
-          data: {
-            code: result.code,
-            map: result.map,
-          },
-          type: result.type,
-        },
-      ],
+      output: result.output,
       dependencies: result.dependencies,
     };
   };
diff --git a/packages/metro/src/node-haste/Module.js b/packages/metro/src/node-haste/Module.js
index 4bf2ceb0..f4b02e1f 100644
--- a/packages/metro/src/node-haste/Module.js
+++ b/packages/metro/src/node-haste/Module.js
@@ -17,17 +17,12 @@ import type {
   TransformedCode,
   Options as WorkerOptions,
 } from '../JSTransformer/worker';
-import type {TransformResultDependency} from '../ModuleGraph/types.flow';
 import type ModuleCache from './ModuleCache';
 import type {LocalPath} from './lib/toLocalPath';
-import type {MetroSourceMapSegmentTuple} from 'metro-source-map';
 
 type ReadResult = {
-  +code: string,
-  +dependencies: $ReadOnlyArray<TransformResultDependency>,
-  +map: Array<MetroSourceMapSegmentTuple>,
+  ...TransformedCode,
   +source: string,
-  +type: string,
 };
 
 export type TransformCode = (
@@ -89,10 +84,8 @@ class Module {
     const module = this;
 
     return {
-      code: result.code,
       dependencies: result.dependencies,
-      map: result.map,
-      type: result.type,
+      output: result.output,
       get source() {
         return module._readSourceCode();
       },
diff --git a/packages/metro/src/node-haste/__tests__/AssetModule-test.js b/packages/metro/src/node-haste/__tests__/AssetModule-test.js
index 16e4fc04..b77c5c2d 100644
--- a/packages/metro/src/node-haste/__tests__/AssetModule-test.js
+++ b/packages/metro/src/node-haste/__tests__/AssetModule-test.js
@@ -41,13 +41,12 @@ describe('AssetModule:', () => {
       localPath: 'image.png',
       moduleCache: new ModuleCache({}),
       transformCode: () => {
-        return Promise.resolve({code: 'module.exports = "asset";'});
+        return Promise.resolve({output: [{code: 'module.exports = "asset";'}]});
       },
     });
 
     const data = await module.read();
 
-    expect(data.code).toBe('module.exports = "asset";');
-    expect(data.source).toBe('');
+    expect(data.output[0].code).toBe('module.exports = "asset";');
   });
 });
diff --git a/packages/metro/src/node-haste/__tests__/Module-test.js b/packages/metro/src/node-haste/__tests__/Module-test.js
index 122c8f59..199a822b 100644
--- a/packages/metro/src/node-haste/__tests__/Module-test.js
+++ b/packages/metro/src/node-haste/__tests__/Module-test.js
@@ -23,9 +23,8 @@ describe('Module', () => {
 
   beforeEach(() => {
     transformCode = jest.fn().mockReturnValue({
-      code: 'int main(void) { return -1; }',
       dependencies: ['stdlib.h', 'conio.h'],
-      map: [],
+      output: [{code: 'int main(void) { return -1; }', map: []}],
     });
 
     moduleCache = new ModuleCache();
@@ -54,9 +53,14 @@ describe('Module', () => {
     fs.readFileSync.mockReturnValue('original code');
 
     expect(await module.read({})).toEqual({
-      code: 'int main(void) { return -1; }',
       dependencies: ['stdlib.h', 'conio.h'],
-      map: [],
+      output: [
+        {
+          code: 'int main(void) { return -1; }',
+
+          map: [],
+        },
+      ],
       source: 'original code',
     });
   });