Needs some polyfills to work in a web worker

Issue is w/ the randy library... Shown is the error and my quick hack to make it work.

![2022-04-17_19-43](https://user-images.githubusercontent.com/1139657/163741849-14a5dd14-81a1-4425-bc15-55fa43c89613.png)

Related issue: https://github.com/deestan/randy/issues/19