How do I import a library like jimp or moment in a Web worker?

I tried to follow the answers given here How to import a library like moment.js into a web worker, but they did not work:

With the entry point, the bundle file was never produced and I couldn't use the web worker.

With the web-worker, it says Attempted import error:

'./myWorker.worker.js' does not contain a default export (imported as 'Worker').

I also tried the solution given here:

Web Workers - How To Import Modules

I was able to access the WebWorker and get it to post a message (unlike in the above solutions), but as soon as I add import statements, it just gives an error like this:

How can I fix this?