Which bundler are you using? in Vite for example you could use https://vite.dev/guide/features.html#web-workers

const worker = new Worker(new URL('./worker.js', import.meta.url))

or

import MyWorker from './worker?worker&inline'

to create an inline worker.

With esbuild you can try this plugin

• https://www.npmjs.com/package/esbuild-plugin-inline-worker

with Webpack is almost the same as Vite

• https://webpack.js.org/guides/web-workers/