From 7e7b050ae74db691de42e65aae35a5008aab95a2 Mon Sep 17 00:00:00 2001
From: "Michael Bradley, Jr" <michaelsbradleyjr@gmail.com>
Date: Mon, 1 Oct 2018 19:20:10 -0500
Subject: [PATCH] raise exception if both Flow and TypeScript are enabled

---
 lib/pipeline/webpack.config.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/pipeline/webpack.config.js b/lib/pipeline/webpack.config.js
index fe914d85a..e44bacf67 100644
--- a/lib/pipeline/webpack.config.js
+++ b/lib/pipeline/webpack.config.js
@@ -216,6 +216,10 @@ if (isTypeScriptEnabled) {
   base.resolve.extensions.push('.ts', '.tsx');
 }
 
+if (isFlowEnabled && isTypeScriptEnabled) {
+  throw new Error('isFlowEnabled and isTypeScriptEnabled cannot both be true');
+}
+
 // development config
 // -----------------------------------------------------------------------------