From 683c8ddad899efa86946fe51df0b9a4a987caf1b Mon Sep 17 00:00:00 2001
From: David Aurelio <davidaurelio@fb.com>
Date: Thu, 25 May 2017 10:11:17 -0700
Subject: [PATCH] Allow RAM bundle output

Summary: Hooks up indexed RAM bundle output for the build.

Reviewed By: jeanlauliac

Differential Revision: D5121515

fbshipit-source-id: 47a540d8ec016a36e21e1daa2876f582dbdb8504
---
 packages/metro-bundler/src/ModuleGraph/ModuleGraph.js | 8 ++++++--
 packages/metro-bundler/src/ModuleGraph/types.flow.js  | 5 +++++
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/packages/metro-bundler/src/ModuleGraph/ModuleGraph.js b/packages/metro-bundler/src/ModuleGraph/ModuleGraph.js
index 9b29505d..3c00b69c 100644
--- a/packages/metro-bundler/src/ModuleGraph/ModuleGraph.js
+++ b/packages/metro-bundler/src/ModuleGraph/ModuleGraph.js
@@ -17,6 +17,7 @@ const seq = require('async/seq');
 const virtualModule = require('./module').virtual;
 
 import type {
+  BuildResult,
   Callback,
   GraphFn,
   GraphResult,
@@ -27,7 +28,7 @@ import type {
 type BuildFn = (
   entryPoints: Iterable<string>,
   options: BuildOptions,
-  callback: Callback<GraphResult>,
+  callback: Callback<BuildResult>,
 ) => void;
 
 type BuildOptions = {|
@@ -86,9 +87,12 @@ exports.createBuildSetup = (
         polyfills,
       } = nullthrows(result);
 
+      const preludeScript = prelude(optimize);
+      const prependedScripts = [preludeScript, ...moduleSystem, ...polyfills];
       callback(null, {
         entryModules,
-        modules: concat([prelude(optimize)], moduleSystem, polyfills, modules),
+        modules: concat(prependedScripts, modules),
+        prependedScripts,
       });
     });
   };
diff --git a/packages/metro-bundler/src/ModuleGraph/types.flow.js b/packages/metro-bundler/src/ModuleGraph/types.flow.js
index 4f66d303..b75b6655 100644
--- a/packages/metro-bundler/src/ModuleGraph/types.flow.js
+++ b/packages/metro-bundler/src/ModuleGraph/types.flow.js
@@ -15,6 +15,11 @@ import type {Ast} from 'babel-core';
 import type {Console} from 'console';
 export type {Transformer} from '../JSTransformer/worker/worker.js';
 
+export type BuildResult = {|
+  ...GraphResult,
+  prependedScripts: $ReadOnlyArray<Module>,
+|};
+
 export type Callback<A = void, B = void>
   = (Error => void)
   & ((null | void, A, B) => void);