using self instead of global if not defined

[jerzyjankowski]

When running in web worker context no global variable is available, instead self is used. Current error: UncaughtReferenceError: global is not defined.

[mreinstein]

it seems like globalThis might be a better solution in that it should work in more environments:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/globalThis