From 7cb49eaa3aad03b60a1e1620d2f700d6ed2b3ea0 Mon Sep 17 00:00:00 2001
From: Akihiko Odaki <akihiko.odaki.4i@stu.hosei.ac.jp>
Date: Sun, 25 Feb 2018 03:10:57 +0900
Subject: [PATCH] Do not use function name to track components (#6542)

UglifyJS2 is allowed to mangle function names, and function names can also
be duplicate if they are from different scopes. Therefore function names
are not reliable as identifiers.

Functions as keys for Map object is a cheaper and more reliable
alternative.
---
 .../mastodon/features/ui/components/bundle.js         | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/app/javascript/mastodon/features/ui/components/bundle.js b/app/javascript/mastodon/features/ui/components/bundle.js
index fc88e0c70..06a6c9cdd 100644
--- a/app/javascript/mastodon/features/ui/components/bundle.js
+++ b/app/javascript/mastodon/features/ui/components/bundle.js
@@ -26,7 +26,7 @@ class Bundle extends React.Component {
     onFetchFail: noop,
   }
 
-  static cache = {}
+  static cache = new Map
 
   state = {
     mod: undefined,
@@ -51,13 +51,12 @@ class Bundle extends React.Component {
 
   load = (props) => {
     const { fetchComponent, onFetch, onFetchSuccess, onFetchFail, renderDelay } = props || this.props;
+    const cachedMod = Bundle.cache.get(fetchComponent);
 
     onFetch();
 
-    if (Bundle.cache[fetchComponent.name]) {
-      const mod = Bundle.cache[fetchComponent.name];
-
-      this.setState({ mod: mod.default });
+    if (cachedMod) {
+      this.setState({ mod: cachedMod.default });
       onFetchSuccess();
       return Promise.resolve();
     }
@@ -71,7 +70,7 @@ class Bundle extends React.Component {
 
     return fetchComponent()
       .then((mod) => {
-        Bundle.cache[fetchComponent.name] = mod;
+        Bundle.cache.set(fetchComponent, mod);
         this.setState({ mod: mod.default });
         onFetchSuccess();
       })