Is it possible to create shared worker from a string and to use it without sharing the worker URL?

Probably this is not possible but I would be glad to hear about alternatives.

I have a large JS script which I want to run in a SharedWorker, but without uploading it to a server before running (it's included in a library which I want to distribute).
With Dedicated Worker I can simply make a Blob. But the Blob URL is unique and also his lifetime is tied to the lifetime of the window that creates it.

What I need is a way to create SharedWorker from a string but this worker should have a URL that any other page should be able to compute exactly. Base64 strings are limited in size, so my question is if there are any alternatives to it.

If you are wanting to create a WebWorker from a string, and this string could be very large. Instead of creating a very large data URI, or Blob URL. You could use that option to bootstrap a WebWorker first. Inside the WebWorker you could then wait for a message sent via postMessage that contained the large code to execute.

One thing to note: you are going to require the webWorker to then new Function or eval the code, so be aware of any XSS attack vectors. From what you are describing this sounds like it's not an issue, but I thought it might be worth pointing out.

Also just found -> https://stackoverflow.com/questions/10343913/how-to-create-a-web-worker-from-a-string That also has a fallback that uses eval so that might also help.