Fix old browsers crashing because of missing `finally` polyfill in web UI (#13115)

Fix #13015

1 files changed, 3 insertions, 0 deletions

diff --git a/app/javascript/mastodon/base_polyfills.js b/app/javascript/mastodon/base_polyfills.js
index 997813a04..12096d902 100644
--- a/app/javascript/mastodon/base_polyfills.js
+++ b/app/javascript/mastodon/base_polyfills.js
@@ -6,6 +6,7 @@ import assign from 'object-assign';
 import values from 'object.values';
 import isNaN from 'is-nan';
 import { decode as decodeBase64 } from './utils/base64';
+import promiseFinally from 'promise.prototype.finally';
 
 if (!Array.prototype.includes) {
   includes.shim();
@@ -23,6 +24,8 @@ if (!Number.isNaN) {
   Number.isNaN = isNaN;
 }
 
+promiseFinally.shim();
+
 if (!HTMLCanvasElement.prototype.toBlob) {
   const BASE64_MARKER = ';base64,';