Support for commonjs exports.xxx?

Seems commonjs modules are not supported?

```js
module.exports.xxx = function () {
return 1
}
```
or
```js
exports.xxx = () => {
...
}

```

Is there a reason for this?

The issue names no files or tests. Start by reproducing both CommonJS examples through workerize-loader's webpack build path and inspect how module exports are handled. Done means both module.exports.xxx and exports.xxx forms work as shown, with their returned values available from the worker.

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