How Webpack working with Worker? No event handlers were registered. This script doe

Developers Workers
1

it looks as Wrangler has embedded Webpack function, In code in Cloudflare panel I can see included library.
But I wanted to assembly package manually. I have prepared webpack.config.js

  ....
  output: {
     filename: "worker.js",
     path: path.resolve(__dirname, "dist"),
     library: 'webpack-test',
     libraryTarget: 'commonjs2'

and receive webpack result in dist folder

     (()=>{"use strict";var e={d:(t,o)=>{ .... }})}};module.exports["webpack-test"]=t})();

Then I try to load this result to Cloudflare “wrangler deploy” with setup in TOML file of webpack result

    ...
    main = "./dist/worker.js"

And receive this strange result

    ⛅️ wrangler 3.36.0
    -------------------
    Total Upload: 2.21 KiB / gzip: 0.96 KiB
    X [ERROR] A request to the Cloudflare API (/accounts/879d75a301cfdc25c307469b83b91862/workers/scripts/webpack) failed.
    No event handlers were registered. This script does nothing.
    [code: 10021]

Why? What I done wrong? Or Webpack not applicable to Worker at all?
I’m newbie with Cloudlare worker, sorry for my stupid question.