diff --git a/packages/metro-bundler/src/Bundler/index.js b/packages/metro-bundler/src/Bundler/index.js
index 1cea4f85..83f06843 100644
--- a/packages/metro-bundler/src/Bundler/index.js
+++ b/packages/metro-bundler/src/Bundler/index.js
@@ -36,6 +36,7 @@ import type {Options as JSTransformerOptions} from '../JSTransformer/worker';
 import type {Reporter} from '../lib/reporting';
 import type {TransformCache} from '../lib/TransformCaching';
 import type {GlobalTransformCache} from '../lib/GlobalTransformCache';
+import type {PostProcessModules} from '../DeltaBundler';
 
 export type BundlingOptions = {|
   +preloadedModules: ?{[string]: true} | false,
@@ -80,18 +81,6 @@ export type ExtendedAssetDescriptor = AssetDescriptor & {
   +fileSystemLocation: string,
 };
 
-export type PostProcessModulesOptions = {|
-  dev: boolean,
-  minify: boolean,
-  platform: string,
-|};
-
-export type PostProcessModules = (
-  modules: Array<ModuleTransport>,
-  entryFile: string,
-  options: PostProcessModulesOptions,
-) => Array<ModuleTransport>;
-
 export type PostMinifyProcess = ({
   code: string,
   map: ?MappingsMap,
diff --git a/packages/metro-bundler/src/Config.js b/packages/metro-bundler/src/Config.js
index 1f13ff75..34a2b431 100644
--- a/packages/metro-bundler/src/Config.js
+++ b/packages/metro-bundler/src/Config.js
@@ -19,9 +19,9 @@ const {providesModuleNodeModules} = require('./defaults');
 import type {
   GetTransformOptions,
   PostMinifyProcess,
-  PostProcessModules,
   PostProcessBundleSourcemap,
 } from './Bundler';
+import type {PostProcessModules} from './DeltaBundler';
 import type {PostProcessModules as PostProcessModulesForBuck} from './ModuleGraph/types.flow.js';
 import type {TransformVariants} from './ModuleGraph/types.flow';
 import type {HasteImpl} from './node-haste/Module';
diff --git a/packages/metro-bundler/src/DeltaBundler/DeltaPatcher.js b/packages/metro-bundler/src/DeltaBundler/DeltaPatcher.js
index cd3eaf2c..066c4db1 100644
--- a/packages/metro-bundler/src/DeltaBundler/DeltaPatcher.js
+++ b/packages/metro-bundler/src/DeltaBundler/DeltaPatcher.js
@@ -95,10 +95,14 @@ class DeltaPatcher {
     return this._lastModifiedDate;
   }
 
-  getAllModules(): Array<DeltaEntry> {
+  getAllModules(
+    modifierFn: (
+      modules: $ReadOnlyArray<DeltaEntry>,
+    ) => $ReadOnlyArray<DeltaEntry> = modules => modules,
+  ): $ReadOnlyArray<DeltaEntry> {
     return [].concat(
       Array.from(this._lastBundle.pre.values()),
-      Array.from(this._lastBundle.modules.values()),
+      modifierFn(Array.from(this._lastBundle.modules.values())),
       Array.from(this._lastBundle.post.values()),
     );
   }
diff --git a/packages/metro-bundler/src/DeltaBundler/DeltaTransformer.js b/packages/metro-bundler/src/DeltaBundler/DeltaTransformer.js
index e5d8ce36..b11c87b3 100644
--- a/packages/metro-bundler/src/DeltaBundler/DeltaTransformer.js
+++ b/packages/metro-bundler/src/DeltaBundler/DeltaTransformer.js
@@ -23,7 +23,7 @@ import type {Options as JSTransformerOptions} from '../JSTransformer/worker';
 import type Resolver from '../Resolver';
 import type {CompactRawMappings} from '../lib/SourceMap';
 import type Module from '../node-haste/Module';
-import type {Options as BundleOptions} from './';
+import type {Options as BundleOptions, MainOptions} from './';
 import type {DependencyEdges} from './traverseDependencies';
 
 export type DeltaEntryType =
@@ -56,11 +56,6 @@ export type DeltaTransformResponse = {|
   +reset: boolean,
 |};
 
-type Options = {|
-  +getPolyfills: ({platform: ?string}) => $ReadOnlyArray<string>,
-  +polyfillModuleNames: $ReadOnlyArray<string>,
-|};
-
 const globalCreateModuleId = createModuleIdFactory();
 
 /**
@@ -94,7 +89,7 @@ class DeltaTransformer extends EventEmitter {
     bundler: Bundler,
     resolver: Resolver,
     deltaCalculator: DeltaCalculator,
-    options: Options,
+    options: MainOptions,
     bundleOptions: BundleOptions,
   ) {
     super();
@@ -122,7 +117,7 @@ class DeltaTransformer extends EventEmitter {
 
   static async create(
     bundler: Bundler,
-    options: Options,
+    options: MainOptions,
     bundleOptions: BundleOptions,
   ): Promise<DeltaTransformer> {
     const resolver = await bundler.getResolver();
diff --git a/packages/metro-bundler/src/DeltaBundler/Serializers.js b/packages/metro-bundler/src/DeltaBundler/Serializers.js
index b96fd9b9..f7217bb8 100644
--- a/packages/metro-bundler/src/DeltaBundler/Serializers.js
+++ b/packages/metro-bundler/src/DeltaBundler/Serializers.js
@@ -76,14 +76,12 @@ async function fullSourceMap(
   deltaBundler: DeltaBundler,
   options: Options,
 ): Promise<string> {
-  const {id, delta} = await _build(deltaBundler, {
+  const {modules} = await _getAllModules(deltaBundler, {
     ...options,
     wrapModules: true,
   });
 
-  const deltaPatcher = DeltaPatcher.get(id).applyDelta(delta);
-
-  return fromRawMappings(deltaPatcher.getAllModules()).toString(undefined, {
+  return fromRawMappings(modules).toString(undefined, {
     excludeSource: options.excludeSource,
   });
 }
@@ -92,14 +90,12 @@ async function fullSourceMapObject(
   deltaBundler: DeltaBundler,
   options: Options,
 ): Promise<MappingsMap> {
-  const {id, delta} = await _build(deltaBundler, {
+  const {modules} = await _getAllModules(deltaBundler, {
     ...options,
     wrapModules: true,
   });
 
-  const deltaPatcher = DeltaPatcher.get(id).applyDelta(delta);
-
-  return fromRawMappings(deltaPatcher.getAllModules()).toMap(undefined, {
+  return fromRawMappings(modules).toMap(undefined, {
     excludeSource: options.excludeSource,
   });
 }
@@ -111,18 +107,17 @@ async function fullBundle(
   deltaBundler: DeltaBundler,
   options: Options,
 ): Promise<{bundle: string, numModifiedFiles: number, lastModified: Date}> {
-  const {id, delta} = await _build(deltaBundler, {
-    ...options,
-    wrapModules: true,
-  });
+  const {modules, numModifiedFiles, lastModified} = await _getAllModules(
+    deltaBundler,
+    options,
+  );
 
-  const deltaPatcher = DeltaPatcher.get(id).applyDelta(delta);
-  const code = deltaPatcher.getAllModules().map(m => m.code);
+  const code = modules.map(m => m.code);
 
   return {
     bundle: code.join('\n'),
-    lastModified: deltaPatcher.getLastModifiedDate(),
-    numModifiedFiles: deltaPatcher.getLastNumModifiedFiles(),
+    lastModified,
+    numModifiedFiles,
   };
 }
 
@@ -130,43 +125,62 @@ async function getAllModules(
   deltaBundler: DeltaBundler,
   options: Options,
 ): Promise<$ReadOnlyArray<DeltaEntry>> {
-  const {id, delta} = await _build(deltaBundler, {
+  const {modules} = await _getAllModules(deltaBundler, {
     ...options,
     wrapModules: true,
   });
 
-  return DeltaPatcher.get(id)
+  return modules;
+}
+
+async function _getAllModules(
+  deltaBundler: DeltaBundler,
+  options: Options,
+): Promise<{
+  modules: $ReadOnlyArray<DeltaEntry>,
+  numModifiedFiles: number,
+  lastModified: Date,
+  deltaTransformer: DeltaTransformer,
+}> {
+  const {id, delta, deltaTransformer} = await _build(deltaBundler, {
+    ...options,
+    wrapModules: true,
+  });
+
+  const deltaPatcher = DeltaPatcher.get(id);
+
+  const modules = deltaPatcher
     .applyDelta(delta)
-    .getAllModules();
+    .getAllModules(deltaBundler.getPostProcessModulesFn(options.entryFile));
+
+  return {
+    deltaTransformer,
+    lastModified: deltaPatcher.getLastModifiedDate(),
+    modules,
+    numModifiedFiles: deltaPatcher.getLastNumModifiedFiles(),
+  };
 }
 
 async function getRamBundleInfo(
   deltaBundler: DeltaBundler,
   options: Options,
 ): Promise<RamBundleInfo> {
-  const {id, delta, deltaTransformer} = await _build(deltaBundler, {
+  const {modules, deltaTransformer} = await _getAllModules(deltaBundler, {
     ...options,
     wrapModules: true,
   });
 
-  const modules = DeltaPatcher.get(id)
-    .applyDelta(delta)
-    .getAllModules()
-    .map(module => {
-      const map = fromRawMappings([module]).toMap(module.path, {
-        excludeSource: options.excludeSource,
-      });
-
-      return {
-        id: module.id,
-        code: module.code,
-        map,
-        name: module.name,
-        sourcePath: module.path,
-        source: module.source,
-        type: module.type,
-      };
-    });
+  const ramModules = modules.map(module => ({
+    id: module.id,
+    code: module.code,
+    map: fromRawMappings([module]).toMap(module.path, {
+      excludeSource: options.excludeSource,
+    }),
+    name: module.name,
+    sourcePath: module.path,
+    source: module.source,
+    type: module.type,
+  }));
 
   const {
     preloadedModules,
@@ -178,7 +192,7 @@ async function getRamBundleInfo(
 
   const startupModules = [];
   const lazyModules = [];
-  modules.forEach(module => {
+  ramModules.forEach(module => {
     if (preloadedModules.hasOwnProperty(module.sourcePath)) {
       startupModules.push(module);
       return;
@@ -226,7 +240,7 @@ async function getAssets(
   deltaBundler: DeltaBundler,
   options: Options,
 ): Promise<$ReadOnlyArray<AssetData>> {
-  const modules = await getAllModules(deltaBundler, options);
+  const {modules} = await _getAllModules(deltaBundler, options);
 
   const assets = await Promise.all(
     modules.map(async module => {
diff --git a/packages/metro-bundler/src/DeltaBundler/__tests__/Serializers-test.js b/packages/metro-bundler/src/DeltaBundler/__tests__/Serializers-test.js
index cb2edca7..9331f69b 100644
--- a/packages/metro-bundler/src/DeltaBundler/__tests__/Serializers-test.js
+++ b/packages/metro-bundler/src/DeltaBundler/__tests__/Serializers-test.js
@@ -21,6 +21,7 @@ describe('Serializers', () => {
   const getDelta = jest.fn();
   const getDependenciesFn = jest.fn();
   const getRamOptions = jest.fn();
+  const postProcessModules = jest.fn();
   let deltaBundler;
 
   const deltaResponse = {
@@ -47,6 +48,7 @@ describe('Serializers', () => {
         ramGroups: [],
       }),
     );
+    postProcessModules.mockImplementation(modules => modules);
 
     deltaBundler = {
       async getDeltaTransformer() {
@@ -66,6 +68,9 @@ describe('Serializers', () => {
           },
         };
       },
+      getPostProcessModulesFn() {
+        return postProcessModules;
+      },
     };
 
     setCurrentTime(CURRENT_TIME);
@@ -253,4 +258,18 @@ describe('Serializers', () => {
       }),
     ).toMatchSnapshot();
   });
+
+  it('should post-process the modules', async () => {
+    postProcessModules.mockImplementation(modules => {
+      return modules.sort(
+        (a, b) => +(a.path < b.path) || +(a.path === b.path) - 1,
+      );
+    });
+
+    expect(
+      await Serializers.getAllModules(deltaBundler, {
+        deltaBundleId: 10,
+      }),
+    ).toMatchSnapshot();
+  });
 });
diff --git a/packages/metro-bundler/src/DeltaBundler/__tests__/__snapshots__/Serializers-test.js.snap b/packages/metro-bundler/src/DeltaBundler/__tests__/__snapshots__/Serializers-test.js.snap
index b0d6d1e0..bcb7cdc5 100644
--- a/packages/metro-bundler/src/DeltaBundler/__tests__/__snapshots__/Serializers-test.js.snap
+++ b/packages/metro-bundler/src/DeltaBundler/__tests__/__snapshots__/Serializers-test.js.snap
@@ -28,6 +28,35 @@ exports[`Serializers should build the full Source Maps 1`] = `"{\\"version\\":3,
 
 exports[`Serializers should build the full Source Maps 2`] = `"{\\"version\\":3,\\"sources\\":[],\\"sourcesContent\\":[],\\"names\\":[],\\"mappings\\":\\"\\"}"`;
 
+exports[`Serializers should post-process the modules 1`] = `
+Array [
+  Object {
+    "code": "pre;",
+    "id": 1,
+    "path": "/pre.js",
+    "type": "script",
+  },
+  Object {
+    "code": "another;",
+    "id": 4,
+    "path": "/4.js",
+    "type": "module",
+  },
+  Object {
+    "code": "module3;",
+    "id": 3,
+    "path": "/3.js",
+    "type": "module",
+  },
+  Object {
+    "code": "post;",
+    "id": 2,
+    "path": "/p",
+    "type": "require",
+  },
+]
+`;
+
 exports[`Serializers should return all the bundle modules 1`] = `
 Array [
   Object {
diff --git a/packages/metro-bundler/src/DeltaBundler/index.js b/packages/metro-bundler/src/DeltaBundler/index.js
index 19547471..462bf024 100644
--- a/packages/metro-bundler/src/DeltaBundler/index.js
+++ b/packages/metro-bundler/src/DeltaBundler/index.js
@@ -16,10 +16,17 @@ const DeltaTransformer = require('./DeltaTransformer');
 
 import type Bundler from '../Bundler';
 import type {BundleOptions} from '../Server';
+import type {DeltaEntry} from './DeltaTransformer';
 
-type MainOptions = {|
+export type PostProcessModules = (
+  modules: $ReadOnlyArray<DeltaEntry>,
+  entryFile: string,
+) => $ReadOnlyArray<DeltaEntry>;
+
+export type MainOptions = {|
   getPolyfills: ({platform: ?string}) => $ReadOnlyArray<string>,
   polyfillModuleNames: $ReadOnlyArray<string>,
+  postProcessModules?: PostProcessModules,
 |};
 
 export type Options = BundleOptions & {
@@ -83,6 +90,18 @@ class DeltaBundler {
       id: bundleId,
     };
   }
+
+  getPostProcessModulesFn(
+    entryPoint: string,
+  ): (modules: $ReadOnlyArray<DeltaEntry>) => $ReadOnlyArray<DeltaEntry> {
+    const postProcessFn = this._options.postProcessModules;
+
+    if (!postProcessFn) {
+      return modules => modules;
+    }
+
+    return entries => postProcessFn(entries, entryPoint);
+  }
 }
 
 module.exports = DeltaBundler;
diff --git a/packages/metro-bundler/src/Server/index.js b/packages/metro-bundler/src/Server/index.js
index 4f73c714..d0c22018 100644
--- a/packages/metro-bundler/src/Server/index.js
+++ b/packages/metro-bundler/src/Server/index.js
@@ -36,7 +36,6 @@ import type {Reporter} from '../lib/reporting';
 import type {Options as DeltaBundlerOptions} from '../DeltaBundler/Serializers';
 import type {
   GetTransformOptions,
-  PostProcessModules,
   PostMinifyProcess,
   PostProcessBundleSourcemap,
 } from '../Bundler';
@@ -45,7 +44,7 @@ import type {GlobalTransformCache} from '../lib/GlobalTransformCache';
 import type {SourceMap, Symbolicate} from './symbolicate';
 import type {AssetData} from '../AssetServer';
 import type {RamBundleInfo} from '../DeltaBundler/Serializers';
-
+import type {PostProcessModules} from '../DeltaBundler';
 const {
   createActionStartEntry,
   createActionEndEntry,
@@ -242,6 +241,7 @@ class Server {
     this._deltaBundler = new DeltaBundler(this._bundler, {
       getPolyfills: this._opts.getPolyfills,
       polyfillModuleNames: this._opts.polyfillModuleNames,
+      postProcessModules: this._opts.postProcessModules,
     });
   }