fix(ie): now failing on custom event

package.json

@@ -18,6 +18,7 @@
     "@webcomponents/template": "^1.5.0",
     "chartkick": "^4.2.0",
     "core-js": "^3.23.3",
+    "custom-event-polyfill": "^1.0.7",
     "debounce": "^1.2.1",
     "dom4": "^2.1.6",
     "email-butler": "^1.0.13",

vite.config.ts

@@ -27,6 +27,7 @@ if (shouldBuildLegacy()) {
         'IE >= 11'
       ],
       additionalLegacyPolyfills: [
+        'custom-event-polyfill',
         '@stimulus/polyfills',
         '@webcomponents/custom-elements',
         '@webcomponents/template',

yarn.lock

@@ -1401,6 +1401,11 @@ csstype@^3.0.2:
   resolved "https://registry.yarnpkg.com/csstype/-/csstype-3.0.10.tgz#2ad3a7bed70f35b965707c092e5f30b327c290e5"
   integrity sha512-2u44ZG2OcNUO9HDp/Jl8C07x6pU/eTR3ncV91SiK3dhG9TWvRVsCoJw14Ckx5DgWkzGA3waZWO3d7pgqpUI/XA==
 
+custom-event-polyfill@^1.0.7:
+  version "1.0.7"
+  resolved "https://registry.yarnpkg.com/custom-event-polyfill/-/custom-event-polyfill-1.0.7.tgz#9bc993ddda937c1a30ccd335614c6c58c4f87aee"
+  integrity sha512-TDDkd5DkaZxZFM8p+1I3yAlvM3rSr1wbrOliG4yJiwinMZN8z/iGL7BTlDkrJcYTmgUSb4ywVCc3ZaUtOtC76w==
+
 dashdash@^1.12.0:
   version "1.14.1"
   resolved "https://registry.yarnpkg.com/dashdash/-/dashdash-1.14.1.tgz#853cfa0f7cbe2fed5de20326b8dd581035f6e2f0"