Comlink - Makes WebWorkers enjoyable. Tiny library, that removes the mental barrier of thinking about postMessage and hides the fact that you are working with workers.
Threads.js - Make web workers & worker threads as simple as a function call.
web-worker - Consistent Web Workers in browser and Node.
workerize-loader - A webpack loader that moves a module and its dependencies into a Web Worker, automatically reflecting exported functions as asynchronous proxies.