From f2e2637c8e351611dc012bba646431feb250a3e8 Mon Sep 17 00:00:00 2001
From: Brian Vaughn <brian.david.vaughn@gmail.com>
Date: Wed, 6 Feb 2019 17:02:14 +0000
Subject: [PATCH] Backwards compat fix for ReactCurrentDispatcher on older
 react versions (#14770)

* Add current owner ref fallback for newer renderers with older react versions
* Replaced current owner forward with current:null
---
 packages/shared/ReactSharedInternals.js | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/packages/shared/ReactSharedInternals.js b/packages/shared/ReactSharedInternals.js
index d8aea57f6bb3a..eaf526199046e 100644
--- a/packages/shared/ReactSharedInternals.js
+++ b/packages/shared/ReactSharedInternals.js
@@ -10,4 +10,13 @@ import React from 'react';
 const ReactSharedInternals =
   React.__SECRET_INTERNALS_DO_NOT_USE_OR_YOU_WILL_BE_FIRED;
 
+// Prevent newer renderers from RTE when used with older react package versions.
+// Current owner and dispatcher used to share the same ref,
+// but PR #14548 split them out to better support the react-debug-tools package.
+if (!ReactSharedInternals.hasOwnProperty('ReactCurrentDispatcher')) {
+  ReactSharedInternals.ReactCurrentDispatcher = {
+    current: null,
+  };
+}
+
 export default ReactSharedInternals;