From 05936a53d4d6731d1b49c05917ccc6bab64ed8e0 Mon Sep 17 00:00:00 2001
From: David Aurelio <davidaurelio@fb.com>
Date: Tue, 23 May 2017 10:24:59 -0700
Subject: [PATCH] Covariant properties for `ModuleTransportLike`

Summary:
Make all properties of `ModuleTraansportLike` covariant to enforce read-only behavior at all sites using it.
The type only exists for compatibility reasons between old and new output functionality, and covariant properties give us stronger guarantees.

Reviewed By: jeanlauliac

Differential Revision: D5111667

fbshipit-source-id: 674658b07eb3a229cbc4344cb636e4a9ea4126d1
---
 packages/metro-bundler/src/lib/ModuleTransport.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/metro-bundler/src/lib/ModuleTransport.js b/packages/metro-bundler/src/lib/ModuleTransport.js
index 4ba20267..9e91ef3c 100644
--- a/packages/metro-bundler/src/lib/ModuleTransport.js
+++ b/packages/metro-bundler/src/lib/ModuleTransport.js
@@ -15,7 +15,7 @@ import type {RawMapping} from '../Bundler/source-map';
 import type Module from '../node-haste/Module';
 import type {SourceMap} from './SourceMap';
 
-type SourceMapOrMappings = SourceMap | Array<RawMapping>;
+export type SourceMapOrMappings = SourceMap | Array<RawMapping>;
 
 type Metadata = {
   dependencies?: ?Array<string>,