diff --git a/packages/metro-config/src/__tests__/__snapshots__/loadConfig-test.js.snap b/packages/metro-config/src/__tests__/__snapshots__/loadConfig-test.js.snap
index a0b141e518..79af065e25 100644
--- a/packages/metro-config/src/__tests__/__snapshots__/loadConfig-test.js.snap
+++ b/packages/metro-config/src/__tests__/__snapshots__/loadConfig-test.js.snap
@@ -90,6 +90,7 @@ Object {
     "dynamicDepsInPackages": "throwAtRuntime",
     "enableBabelRCLookup": true,
     "enableBabelRuntime": true,
+    "experimentalImportBundleSupport": false,
     "getTransformOptions": [Function],
     "minifierConfig": Object {
       "compress": Object {
@@ -217,6 +218,7 @@ Object {
     "dynamicDepsInPackages": "throwAtRuntime",
     "enableBabelRCLookup": true,
     "enableBabelRuntime": true,
+    "experimentalImportBundleSupport": false,
     "getTransformOptions": [Function],
     "minifierConfig": Object {
       "compress": Object {
diff --git a/packages/metro-config/src/configTypes.flow.js b/packages/metro-config/src/configTypes.flow.js
index c6385c6090..1537310d82 100644
--- a/packages/metro-config/src/configTypes.flow.js
+++ b/packages/metro-config/src/configTypes.flow.js
@@ -139,6 +139,7 @@ type TransformerConfigT = {|
   transformVariants: TransformVariants,
   workerPath: string,
   publicPath: string,
+  experimentalImportBundleSupport: boolean,
 |};
 
 export type VisualizerConfigT = {|
diff --git a/packages/metro-config/src/convertConfig.js b/packages/metro-config/src/convertConfig.js
index 9aa795f886..7a6fea236f 100644
--- a/packages/metro-config/src/convertConfig.js
+++ b/packages/metro-config/src/convertConfig.js
@@ -134,6 +134,7 @@ async function convertOldToNew({
       dynamicDepsInPackages,
       enableBabelRCLookup: getEnableBabelRCLookup(),
       enableBabelRuntime: true,
+      experimentalImportBundleSupport: false,
       getTransformOptions,
       minifierConfig: defaultConfig.transformer.minifierConfig,
       minifierPath: minifierPath || defaultConfig.transformer.minifierPath,
diff --git a/packages/metro-config/src/defaults/index.js b/packages/metro-config/src/defaults/index.js
index 96182d8c05..d1db6b3f13 100644
--- a/packages/metro-config/src/defaults/index.js
+++ b/packages/metro-config/src/defaults/index.js
@@ -72,6 +72,7 @@ const getDefaultValues = (projectRoot: ?string): ConfigT => ({
     dynamicDepsInPackages: 'throwAtRuntime',
     enableBabelRCLookup: true,
     enableBabelRuntime: true,
+    experimentalImportBundleSupport: false,
     getTransformOptions: async () => ({
       transform: {
         experimentalImportSupport: false,
diff --git a/packages/metro-visualizer/src/middleware/graph-api/testGraph.js b/packages/metro-visualizer/src/middleware/graph-api/testGraph.js
index 0ded858564..aed7c1c57a 100644
--- a/packages/metro-visualizer/src/middleware/graph-api/testGraph.js
+++ b/packages/metro-visualizer/src/middleware/graph-api/testGraph.js
@@ -152,6 +152,7 @@ const dummyMetroGraph: Graph<> = {
     ],
   ]),
   entryPoints: ['foo'],
+  importBundleNames: new Set(),
 };
 
 module.exports = dummyMetroGraph;
diff --git a/packages/metro/src/DeltaBundler/DeltaCalculator.js b/packages/metro/src/DeltaBundler/DeltaCalculator.js
index 9ca6f95f71..8684375240 100644
--- a/packages/metro/src/DeltaBundler/DeltaCalculator.js
+++ b/packages/metro/src/DeltaBundler/DeltaCalculator.js
@@ -49,6 +49,7 @@ class DeltaCalculator<T> extends EventEmitter {
     this._graph = {
       dependencies: new Map(),
       entryPoints,
+      importBundleNames: new Set(),
     };
 
     this._dependencyGraph
@@ -70,6 +71,7 @@ class DeltaCalculator<T> extends EventEmitter {
     this._graph = {
       dependencies: new Map(),
       entryPoints: this._graph.entryPoints,
+      importBundleNames: new Set(),
     };
     this._modifiedFiles = new Set();
     this._deletedFiles = new Set();
diff --git a/packages/metro/src/DeltaBundler/Serializers/__tests__/baseJSBundle-test.js b/packages/metro/src/DeltaBundler/Serializers/__tests__/baseJSBundle-test.js
index f919565f53..4cdcdfc421 100644
--- a/packages/metro/src/DeltaBundler/Serializers/__tests__/baseJSBundle-test.js
+++ b/packages/metro/src/DeltaBundler/Serializers/__tests__/baseJSBundle-test.js
@@ -62,6 +62,7 @@ it('should generate a very simple bundle', () => {
           ['/root/bar', barModule],
         ]),
         entryPoints: ['foo'],
+        importBundleNames: new Set(),
       },
       {
         processModuleFilter: () => true,
@@ -75,22 +76,22 @@ it('should generate a very simple bundle', () => {
       },
     ),
   ).toMatchInlineSnapshot(`
-Object {
-  "modules": Array [
-    Array [
-      "foo",
-      "__d(function() {/* code for foo */},\\"foo\\",[\\"bar\\"],\\"foo\\");",
-    ],
-    Array [
-      "bar",
-      "__d(function() {/* code for bar */},\\"bar\\",[],\\"bar\\");",
-    ],
-  ],
-  "post": "require(\\"foo\\");
-//# sourceMappingURL=http://localhost/bundle.map",
-  "pre": "__d(function() {/* code for polyfill */});",
-}
-`);
+    Object {
+      "modules": Array [
+        Array [
+          "foo",
+          "__d(function() {/* code for foo */},\\"foo\\",[\\"bar\\"],\\"foo\\");",
+        ],
+        Array [
+          "bar",
+          "__d(function() {/* code for bar */},\\"bar\\",[],\\"bar\\");",
+        ],
+      ],
+      "post": "require(\\"foo\\");
+    //# sourceMappingURL=http://localhost/bundle.map",
+      "pre": "__d(function() {/* code for polyfill */});",
+    }
+  `);
 });
 
 it('should add runBeforeMainModule statements if found in the graph', () => {
@@ -104,6 +105,7 @@ it('should add runBeforeMainModule statements if found in the graph', () => {
           ['/root/bar', barModule],
         ]),
         entryPoints: ['/root/foo'],
+        importBundleNames: new Set(),
       },
       {
         processModuleFilter: () => true,
@@ -117,10 +119,10 @@ it('should add runBeforeMainModule statements if found in the graph', () => {
       },
     ).post,
   ).toMatchInlineSnapshot(`
-"require(\\"bar\\");
-require(\\"foo\\");
-//# sourceMappingURL=http://localhost/bundle.map"
-`);
+    "require(\\"bar\\");
+    require(\\"foo\\");
+    //# sourceMappingURL=http://localhost/bundle.map"
+  `);
 });
 
 it('should handle numeric module ids', () => {
@@ -134,6 +136,7 @@ it('should handle numeric module ids', () => {
           ['/root/bar', barModule],
         ]),
         entryPoints: ['/root/foo'],
+        importBundleNames: new Set(),
       },
       {
         processModuleFilter: () => true,
@@ -147,17 +150,17 @@ it('should handle numeric module ids', () => {
       },
     ).modules,
   ).toMatchInlineSnapshot(`
-Array [
-  Array [
-    0,
-    "__d(function() {/* code for foo */},0,[1],\\"foo\\");",
-  ],
-  Array [
-    1,
-    "__d(function() {/* code for bar */},1,[],\\"bar\\");",
-  ],
-]
-`);
+    Array [
+      Array [
+        0,
+        "__d(function() {/* code for foo */},0,[1],\\"foo\\");",
+      ],
+      Array [
+        1,
+        "__d(function() {/* code for bar */},1,[],\\"bar\\");",
+      ],
+    ]
+  `);
 });
 
 it('outputs custom runModule statements', () => {
@@ -171,6 +174,7 @@ it('outputs custom runModule statements', () => {
           ['/root/bar', barModule],
         ]),
         entryPoints: ['/root/foo'],
+        importBundleNames: new Set(),
       },
       {
         processModuleFilter: () => true,
@@ -184,9 +188,9 @@ it('outputs custom runModule statements', () => {
       },
     ).post,
   ).toMatchInlineSnapshot(`
-"export default require(\\"bar\\").default;
-export default require(\\"foo\\").default;"
-`);
+    "export default require(\\"bar\\").default;
+    export default require(\\"foo\\").default;"
+  `);
 });
 
 it('should add an inline source map to a very simple bundle', () => {
@@ -199,6 +203,7 @@ it('should add an inline source map to a very simple bundle', () => {
         ['/root/bar', barModule],
       ]),
       entryPoints: ['foo'],
+      importBundleNames: new Set(),
     },
     {
       processModuleFilter: () => true,
@@ -241,6 +246,7 @@ it('does not add polyfills when `modulesOnly` is used', () => {
           ['/root/bar', barModule],
         ]),
         entryPoints: ['foo'],
+        importBundleNames: new Set(),
       },
       {
         processModuleFilter: () => true,
@@ -255,20 +261,65 @@ it('does not add polyfills when `modulesOnly` is used', () => {
       },
     ),
   ).toMatchInlineSnapshot(`
-Object {
-  "modules": Array [
-    Array [
-      "foo",
-      "__d(function() {/* code for foo */},\\"foo\\",[\\"bar\\"],\\"foo\\");",
-    ],
-    Array [
-      "bar",
-      "__d(function() {/* code for bar */},\\"bar\\",[],\\"bar\\");",
-    ],
-  ],
-  "post": "require(\\"foo\\");
-//# sourceMappingURL=http://localhost/bundle.map",
-  "pre": "",
-}
-`);
+    Object {
+      "modules": Array [
+        Array [
+          "foo",
+          "__d(function() {/* code for foo */},\\"foo\\",[\\"bar\\"],\\"foo\\");",
+        ],
+        Array [
+          "bar",
+          "__d(function() {/* code for bar */},\\"bar\\",[],\\"bar\\");",
+        ],
+      ],
+      "post": "require(\\"foo\\");
+    //# sourceMappingURL=http://localhost/bundle.map",
+      "pre": "",
+    }
+  `);
+});
+
+it('adds lazy imports at the end of a bundle', () => {
+  expect(
+    baseJSBundle(
+      '/root/foo',
+      [polyfill],
+      {
+        dependencies: new Map([
+          ['/root/foo', fooModule],
+          ['/root/bar', barModule],
+        ]),
+        entryPoints: ['foo'],
+        importBundleNames: new Set(['/path/to/async/module.js']),
+      },
+      {
+        asyncRequireModulePath: '/asyncRequire.js',
+        processModuleFilter: () => true,
+        createModuleId: filePath => path.basename(filePath),
+        dev: true,
+        getRunModuleStatement,
+        projectRoot: '/root',
+        runBeforeMainModule: [],
+        runModule: true,
+        sourceMapUrl: 'http://localhost/bundle.map',
+      },
+    ),
+  ).toMatchInlineSnapshot(`
+    Object {
+      "modules": Array [
+        Array [
+          "foo",
+          "__d(function() {/* code for foo */},\\"foo\\",[\\"bar\\"],\\"foo\\");",
+        ],
+        Array [
+          "bar",
+          "__d(function() {/* code for bar */},\\"bar\\",[],\\"bar\\");",
+        ],
+      ],
+      "post": "(function(){var $$=require(\\"asyncRequire.js\\");$$.addImportBundleNames({\\"module.js\\":\\"../path/to/async/module.bundle\\"})})();
+    require(\\"foo\\");
+    //# sourceMappingURL=http://localhost/bundle.map",
+      "pre": "__d(function() {/* code for polyfill */});",
+    }
+  `);
 });
diff --git a/packages/metro/src/DeltaBundler/Serializers/__tests__/deltaJSBundle-test.js b/packages/metro/src/DeltaBundler/Serializers/__tests__/deltaJSBundle-test.js
index 3a85b88cb0..8c6a6a3ac3 100644
--- a/packages/metro/src/DeltaBundler/Serializers/__tests__/deltaJSBundle-test.js
+++ b/packages/metro/src/DeltaBundler/Serializers/__tests__/deltaJSBundle-test.js
@@ -38,6 +38,7 @@ const graph = {
     createModule('bar', []),
   ]),
   entryPoints: ['/root/entrypoint.js'],
+  importBundleNames: new Set(),
 };
 
 const options = {
diff --git a/packages/metro/src/DeltaBundler/Serializers/__tests__/getRamBundleInfo-test.js b/packages/metro/src/DeltaBundler/Serializers/__tests__/getRamBundleInfo-test.js
index f7a0a72c0b..0006115e56 100644
--- a/packages/metro/src/DeltaBundler/Serializers/__tests__/getRamBundleInfo-test.js
+++ b/packages/metro/src/DeltaBundler/Serializers/__tests__/getRamBundleInfo-test.js
@@ -39,6 +39,7 @@ const graph = {
     createModule('bar', []),
     createModule('qux', []),
   ]),
+  importBundleNames: new Set(),
 };
 
 const pre = [createModule('pre', [], 'js/script')[1]];
diff --git a/packages/metro/src/DeltaBundler/Serializers/baseJSBundle.js b/packages/metro/src/DeltaBundler/Serializers/baseJSBundle.js
index 20491825c6..8160d07a0e 100644
--- a/packages/metro/src/DeltaBundler/Serializers/baseJSBundle.js
+++ b/packages/metro/src/DeltaBundler/Serializers/baseJSBundle.js
@@ -53,14 +53,21 @@ function baseJSBundle(
   );
 
   const postCode = processModules(
-    getAppendScripts(entryPoint, [...preModules, ...modules], {
-      createModuleId: options.createModuleId,
-      getRunModuleStatement: options.getRunModuleStatement,
-      runBeforeMainModule: options.runBeforeMainModule,
-      runModule: options.runModule,
-      sourceMapUrl: options.sourceMapUrl,
-      inlineSourceMap: options.inlineSourceMap,
-    }),
+    getAppendScripts(
+      entryPoint,
+      [...preModules, ...modules],
+      graph.importBundleNames,
+      {
+        asyncRequireModulePath: options.asyncRequireModulePath,
+        createModuleId: options.createModuleId,
+        getRunModuleStatement: options.getRunModuleStatement,
+        inlineSourceMap: options.inlineSourceMap,
+        projectRoot: options.projectRoot,
+        runBeforeMainModule: options.runBeforeMainModule,
+        runModule: options.runModule,
+        sourceMapUrl: options.sourceMapUrl,
+      },
+    ),
     processModulesOptions,
   )
     .map(([_, code]) => code)
diff --git a/packages/metro/src/DeltaBundler/Serializers/deltaJSBundle.js b/packages/metro/src/DeltaBundler/Serializers/deltaJSBundle.js
index 4553d5fe75..14fcbcb118 100644
--- a/packages/metro/src/DeltaBundler/Serializers/deltaJSBundle.js
+++ b/packages/metro/src/DeltaBundler/Serializers/deltaJSBundle.js
@@ -54,6 +54,7 @@ function deltaJSBundle(
     const appendScripts = getAppendScripts(
       entryPoint,
       [...pre, ...modules],
+      graph.importBundleNames,
       options,
     );
 
diff --git a/packages/metro/src/DeltaBundler/Serializers/getRamBundleInfo.js b/packages/metro/src/DeltaBundler/Serializers/getRamBundleInfo.js
index 244c5ac6ae..c120d37196 100644
--- a/packages/metro/src/DeltaBundler/Serializers/getRamBundleInfo.js
+++ b/packages/metro/src/DeltaBundler/Serializers/getRamBundleInfo.js
@@ -50,7 +50,9 @@ async function getRamBundleInfo(
     ...pre,
     ...graph.dependencies.values(),
   ];
-  modules = modules.concat(getAppendScripts(entryPoint, modules, options));
+  modules = modules.concat(
+    getAppendScripts(entryPoint, modules, graph.importBundleNames, options),
+  );
 
   modules.forEach((module: Module<>) => options.createModuleId(module.path));
 
diff --git a/packages/metro/src/DeltaBundler/traverseDependencies.js b/packages/metro/src/DeltaBundler/traverseDependencies.js
index 9ef24844f7..8cff933318 100644
--- a/packages/metro/src/DeltaBundler/traverseDependencies.js
+++ b/packages/metro/src/DeltaBundler/traverseDependencies.js
@@ -39,21 +39,24 @@ type Delta = $ReadOnly<{|
 |}>;
 
 type InternalOptions<T> = $ReadOnly<{|
-  resolve: $PropertyType<Options<T>, 'resolve'>,
-  transform: $PropertyType<Options<T>, 'transform'>,
+  experimentalImportBundleSupport: boolean,
   onDependencyAdd: () => mixed,
   onDependencyAdded: () => mixed,
+  resolve: $PropertyType<Options<T>, 'resolve'>,
+  transform: $PropertyType<Options<T>, 'transform'>,
 |}>;
 
 function getInternalOptions<T>({
   transform,
   resolve,
   onProgress,
+  experimentalImportBundleSupport,
 }: Options<T>): InternalOptions<T> {
   let numProcessed = 0;
   let total = 0;
 
   return {
+    experimentalImportBundleSupport,
     transform,
     resolve,
     onDependencyAdd: () => onProgress && onProgress(numProcessed, ++total),
@@ -229,7 +232,12 @@ async function processModule<T>(
   const promises = [];
 
   for (const [relativePath, dependency] of currentDependencies) {
-    if (!previousDependencies.has(relativePath)) {
+    if (
+      options.experimentalImportBundleSupport &&
+      dependency.data.data.isAsync
+    ) {
+      graph.importBundleNames.add(dependency.absolutePath);
+    } else if (!previousDependencies.has(relativePath)) {
       promises.push(
         addDependency(module, dependency.absolutePath, graph, delta, options),
       );
@@ -369,7 +377,11 @@ function reorderDependencies<T>(
     const childModule = graph.dependencies.get(path);
 
     if (!childModule) {
-      throw new ReferenceError('Module not registered in graph: ' + path);
+      if (dependency.data.data.isAsync) {
+        return;
+      } else {
+        throw new ReferenceError('Module not registered in graph: ' + path);
+      }
     }
 
     reorderDependencies(graph, childModule, orderedDependencies);
diff --git a/packages/metro/src/DeltaBundler/types.flow.js b/packages/metro/src/DeltaBundler/types.flow.js
index bc0e5d98b0..77a8343122 100644
--- a/packages/metro/src/DeltaBundler/types.flow.js
+++ b/packages/metro/src/DeltaBundler/types.flow.js
@@ -54,6 +54,7 @@ export type Module<T = MixedOutput> = {|
 
 export type Graph<T = MixedOutput> = {|
   dependencies: Map<string, Module<T>>,
+  importBundleNames: Set<string>,
   +entryPoints: $ReadOnlyArray<string>,
 |};
 
@@ -75,6 +76,7 @@ export type Options<T = MixedOutput> = {|
   +resolve: (from: string, to: string) => string,
   +transform: TransformFn<T>,
   +onProgress: ?(numProcessed: number, total: number) => mixed,
+  +experimentalImportBundleSupport: boolean,
 |};
 
 export type DeltaResult<T = MixedOutput> = {|
@@ -85,6 +87,7 @@ export type DeltaResult<T = MixedOutput> = {|
 |};
 
 export type SerializerOptions = {|
+  +asyncRequireModulePath: string,
   +createModuleId: string => number,
   +dev: boolean,
   +getRunModuleStatement: (number | string) => string,
diff --git a/packages/metro/src/IncrementalBundler.js b/packages/metro/src/IncrementalBundler.js
index dc90426055..379a112dc8 100644
--- a/packages/metro/src/IncrementalBundler.js
+++ b/packages/metro/src/IncrementalBundler.js
@@ -129,6 +129,8 @@ class IncrementalBundler {
         transformOptions,
       ),
       onProgress: otherOptions.onProgress,
+      experimentalImportBundleSupport: this._config.transformer
+        .experimentalImportBundleSupport,
     });
 
     this._config.serializer.experimentalSerializerHook(graph, {
diff --git a/packages/metro/src/JSTransformer/worker.js b/packages/metro/src/JSTransformer/worker.js
index 380e816901..8bb32ebbc0 100644
--- a/packages/metro/src/JSTransformer/worker.js
+++ b/packages/metro/src/JSTransformer/worker.js
@@ -61,6 +61,7 @@ export type JsTransformerConfig = $ReadOnly<{|
   dynamicDepsInPackages: DynamicRequiresBehavior,
   enableBabelRCLookup: boolean,
   enableBabelRuntime: boolean,
+  experimentalImportBundleSupport: boolean,
   minifierConfig: MinifierConfig,
   minifierPath: string,
   optimizationSizeLimit: number,
diff --git a/packages/metro/src/Server.js b/packages/metro/src/Server.js
index 4b9be54cd3..966e0f9c0c 100644
--- a/packages/metro/src/Server.js
+++ b/packages/metro/src/Server.js
@@ -194,6 +194,7 @@ class Server {
     const entryPoint = path.resolve(this._config.projectRoot, entryFile);
 
     const bundle = baseJSBundle(entryPoint, prepend, graph, {
+      asyncRequireModulePath: this._config.transformer.asyncRequireModulePath,
       processModuleFilter: this._config.serializer.processModuleFilter,
       createModuleId: this._createModuleId,
       getRunModuleStatement: this._config.serializer.getRunModuleStatement,
@@ -234,6 +235,7 @@ class Server {
     const entryPoint = path.resolve(this._config.projectRoot, entryFile);
 
     return await getRamBundleInfo(entryPoint, prepend, graph, {
+      asyncRequireModulePath: this._config.transformer.asyncRequireModulePath,
       processModuleFilter: this._config.serializer.processModuleFilter,
       createModuleId: this._createModuleId,
       dev: transformOptions.dev,
@@ -652,6 +654,8 @@ class Server {
         revision.id,
         revision.graph,
         {
+          asyncRequireModulePath: this._config.transformer
+            .asyncRequireModulePath,
           processModuleFilter: this._config.serializer.processModuleFilter,
           createModuleId: this._createModuleId,
           dev: transformOptions.dev,
@@ -731,6 +735,7 @@ class Server {
         ((...args) => bundleToString(baseJSBundle(...args)).code);
 
       const bundle = serializer(entryFile, revision.prepend, revision.graph, {
+        asyncRequireModulePath: this._config.transformer.asyncRequireModulePath,
         processModuleFilter: this._config.serializer.processModuleFilter,
         createModuleId: this._createModuleId,
         getRunModuleStatement: this._config.serializer.getRunModuleStatement,
@@ -873,6 +878,7 @@ class Server {
       }
 
       const base = baseJSBundle(entryFile, revision.prepend, revision.graph, {
+        asyncRequireModulePath: this._config.transformer.asyncRequireModulePath,
         processModuleFilter: this._config.serializer.processModuleFilter,
         createModuleId: this._createModuleId,
         getRunModuleStatement: this._config.serializer.getRunModuleStatement,
diff --git a/packages/metro/src/Server/__tests__/Server-test.js b/packages/metro/src/Server/__tests__/Server-test.js
index e29069a9ab..96c8ad8cce 100644
--- a/packages/metro/src/Server/__tests__/Server-test.js
+++ b/packages/metro/src/Server/__tests__/Server-test.js
@@ -153,6 +153,7 @@ describe('processRequest', () => {
       const graph = {
         entryPoints: ['/root/mybundle.js'],
         dependencies,
+        importBundleNames: new Set(),
       };
       currentGraphs.add(graph);
 
@@ -392,9 +393,10 @@ describe('processRequest', () => {
     expect(DeltaBundler.prototype.buildGraph).toBeCalledWith(
       ['/root/index.js'],
       {
+        experimentalImportBundleSupport: false,
+        onProgress: expect.any(Function),
         resolve: expect.any(Function),
         transform: expect.any(Function),
-        onProgress: expect.any(Function),
       },
     );
   });
@@ -710,9 +712,10 @@ describe('processRequest', () => {
       expect(DeltaBundler.prototype.buildGraph).toBeCalledWith(
         ['/root/foo file'],
         {
+          experimentalImportBundleSupport: false,
+          onProgress: null,
           resolve: expect.any(Function),
           transform: expect.any(Function),
-          onProgress: null,
         },
       );
     });
diff --git a/packages/metro/src/lib/getAppendScripts.js b/packages/metro/src/lib/getAppendScripts.js
index 6ffff05ffb..8626467076 100644
--- a/packages/metro/src/lib/getAppendScripts.js
+++ b/packages/metro/src/lib/getAppendScripts.js
@@ -12,26 +12,58 @@
 
 const getInlineSourceMappingURL = require('../DeltaBundler/Serializers/helpers/getInlineSourceMappingURL');
 const nullthrows = require('nullthrows');
+const path = require('path');
 const sourceMapString = require('../DeltaBundler/Serializers/sourceMapString');
 
 import type {Module} from '../DeltaBundler';
 
 type Options<T: number | string> = {
+  +asyncRequireModulePath: string,
   +createModuleId: string => T,
   +getRunModuleStatement: T => string,
+  +inlineSourceMap: ?boolean,
+  +projectRoot: string,
   +runBeforeMainModule: $ReadOnlyArray<string>,
   +runModule: boolean,
   +sourceMapUrl: ?string,
-  +inlineSourceMap: ?boolean,
 };
 
 function getAppendScripts<T: number | string>(
   entryPoint: string,
   modules: $ReadOnlyArray<Module<>>,
+  importBundleNames: Set<string>,
   options: Options<T>,
 ): $ReadOnlyArray<Module<>> {
   const output = [];
 
+  if (importBundleNames.size) {
+    const importBundleNamesObject = Object.create(null);
+    importBundleNames.forEach(absolutePath => {
+      const bundlePath = path.relative(options.projectRoot, absolutePath);
+      importBundleNamesObject[options.createModuleId(absolutePath)] =
+        bundlePath.slice(0, -path.extname(bundlePath).length) + '.bundle';
+    });
+    output.push({
+      path: '$$importBundleNames',
+      dependencies: new Map(),
+      getSource: (): Buffer => Buffer.from(''),
+      inverseDependencies: new Set(),
+      output: [
+        {
+          type: 'js/script/virtual',
+          data: {
+            code: `(function(){var $$=${options.getRunModuleStatement(
+              options.createModuleId(options.asyncRequireModulePath),
+            )}$$.addImportBundleNames(${String(
+              JSON.stringify(importBundleNamesObject),
+            )})})();`,
+            map: [],
+          },
+        },
+      ],
+    });
+  }
+
   if (options.runModule) {
     const paths = [...options.runBeforeMainModule, entryPoint];
 
diff --git a/packages/metro/src/lib/getPrependedScripts.js b/packages/metro/src/lib/getPrependedScripts.js
index 1516fa14c5..58e88949b1 100644
--- a/packages/metro/src/lib/getPrependedScripts.js
+++ b/packages/metro/src/lib/getPrependedScripts.js
@@ -56,6 +56,8 @@ async function getPrependedScripts(
         transformOptions,
       ),
       onProgress: null,
+      experimentalImportBundleSupport:
+        config.transformer.experimentalImportBundleSupport,
     },
   );
 
diff --git a/packages/metro/src/lib/transformHelpers.js b/packages/metro/src/lib/transformHelpers.js
index 3e75215ae4..3504053db3 100644
--- a/packages/metro/src/lib/transformHelpers.js
+++ b/packages/metro/src/lib/transformHelpers.js
@@ -68,6 +68,8 @@ async function calcTransformerOptions(
         minify: false,
       }),
       onProgress: null,
+      experimentalImportBundleSupport:
+        config.transformer.experimentalImportBundleSupport,
     });
 
     return Array.from(dependencies.keys());