rollup plugin warning

README.md

run npm start

$ rollup -c && webpack rolled-up.js

> [email protected] start /dev/tmp-rollup-webpack
> rollup -c && webpack rolled-up.js


index.js → rolled-up.js...
created rolled-up.js in 31ms
Hash: 77d134ef0777e5fa1641
Version: webpack 4.43.0
Time: 125ms
Built at: 05/02/2020 8:00:43 AM
  Asset    Size  Chunks             Chunk Names
main.js  69 KiB    main  [emitted]  main
Entrypoint main = main.js
[./node_modules/webpack/buildin/global.js] (webpack)/buildin/global.js 472 bytes {main} [built]
[./node_modules/webpack/buildin/module.js] (webpack)/buildin/module.js 497 bytes {main} [built]
[./rolled-up.js] 2.81 KiB {main} [built]
    + 5 hidden modules

WARNING in ./rolled-up.js
Module not found: Error: Can't resolve 'worker_threads' in '/dev/tmp-rollup-webpack'
 @ ./rolled-up.js

index.js

import Worker from 'web-worker:./webworker.js';

export default () => {
    return new Worker();
}

package.json

{
  "name": "tmp-rollup-webpack",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "rollup -c && webpack rolled-up.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "rollup": "^2.7.2",
    "webpack": "^4.43.0",
    "rollup-plugin-web-worker-loader": "git+https://[email protected]/darionco/rollup-plugin-web-worker-loader.git",
    "webpack-cli": "^3.3.11"
  }
}

rollup.config.js

import webWorkerLoader from 'rollup-plugin-web-worker-loader';

export default {
    input: 'index.js',
    output: [
        {
            file: 'rolled-up.js',
            format: 'commonjs',
        },
    ],
    plugins: [
        webWorkerLoader()
    ],
}

webpack.config.js

module.exports = {
    mode: 'development',
    target: 'web',
    devtool: false,
};

webworker.js

console.log('foo');