From fffc5e8511b048fc6fcafeb48ac11ccb12bf0cd2 Mon Sep 17 00:00:00 2001
From: Edmond Chui <chui.hinwai@gmail.com>
Date: Wed, 29 Apr 2020 16:08:34 -0600
Subject: [PATCH] Update index.js

---
 react_ujs/index.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/react_ujs/index.js b/react_ujs/index.js
index 0ef70a5a3..84e9665ea 100644
--- a/react_ujs/index.js
+++ b/react_ujs/index.js
@@ -73,6 +73,11 @@ var ReactRailsUJS = {
   useContext: function(requireContext) {
     this.getConstructor = constructorFromRequireContextWithGlobalFallback(requireContext)
   },
+  
+  // Called after React unmounts component at `node`
+  // Override this function to perform any cleanup
+  // the default function does nothing
+  onComponentUnmountAtNode: function (node) {},
 
   // Render `componentName` with `props` to a string,
   // using the specified `renderFunction` from `react-dom/server`.
@@ -135,6 +140,7 @@ var ReactRailsUJS = {
     for (var i = 0; i < nodes.length; ++i) {
       var node = nodes[i];
       ReactDOM.unmountComponentAtNode(node);
+      ReactRailsUJS.onComponentUnmountAtNode(node);
     }
   },