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A webpack loader that moves a module and its dependencies into a Web Worker, automatically reflecting exported functions as asynchronous proxies.

  • Bundles a tiny, purpose-built RPC implementation into your app
  • If exported module methods are already async, signature is unchanged
  • Supports synchronous and asynchronous worker functions
  • Works beautifully with async/await
  • Imported value is instantiable, just a decorated Worker


npm install -D workerize-loader



// block for `time` ms, then return the number of loops we could run in that time:
export function expensive(time) {
    let start = Date.now(),
        count = 0
    while (Date.now() - start < time) count++
    return count

index.js: (our demo)

import worker from 'workerize-loader!./worker'

let instance = worker()  // `new` is optional

instance.expensive(1000).then( count => {
    console.log(`Ran ${count} loops`)


The inner workings here are heavily inspired by worker-loader. It's worth a read!


MIT License © Jason Miller