>>529642151
https://github.com/SillyTavern/SillyTavern/blob/release/public/lib/polyfill.js
https://github.com/SillyTavern/SillyTavern/blob/release/public/lib/dialog-polyfill.esm.js
https://github.com/SillyTavern/SillyTavern/blob/release/public/lib/structured-clone/monkey-patch.js
I honestly think that just telling people with outdated browsers to kill themselves is better than randomly polyfilling like 5 things.