From 54d09aa9519b231be3b0334e8502ba7611da1752 Mon Sep 17 00:00:00 2001
From: John Knox <jknox@fb.com>
Date: Thu, 29 Nov 2018 08:48:33 -0800
Subject: [PATCH] Fix open source yarn start

Summary: The fb-stubs transform is getting applied when it shouldn't. Fix it by only applying it if src/fb exists.

Reviewed By: danielbuechele

Differential Revision: D13236217

fbshipit-source-id: 940def377839d16f34c49504948cb062916a3d6a
---
 static/transforms/index.js | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/static/transforms/index.js b/static/transforms/index.js
index be2d0f04a..3737f812a 100644
--- a/static/transforms/index.js
+++ b/static/transforms/index.js
@@ -8,6 +8,8 @@
 const generate = require('@babel/generator').default;
 const babylon = require('@babel/parser');
 const babel = require('@babel/core');
+const fs = require('fs');
+const path = require('path');
 
 function transform({filename, options, src}) {
   const presets = [require('../node_modules/@babel/preset-react')];
@@ -33,10 +35,17 @@ function transform({filename, options, src}) {
     require('../node_modules/@babel/plugin-proposal-class-properties'),
     require('../node_modules/@babel/plugin-transform-flow-strip-types'),
     require('../node_modules/@babel/plugin-proposal-optional-chaining'),
-    require('./fb-stubs.js'),
     require('./dynamic-requires.js'),
   ];
 
+  if (
+    fs.existsSync(
+      path.resolve(path.dirname(path.dirname(__dirname)), 'src', 'fb'),
+    )
+  ) {
+    plugins.push(require('./fb-stubs.js'));
+  }
+
   if (options.isTestRunner) {
     if (process.env.USE_ELECTRON_STUBS) {
       plugins.push(require('./electron-stubs.js'));