esbuild configuration: webworker support

I'm trying to get an [11ty](https://www.11ty.dev) with [esbuild](https://esbuild.github.io) structure setup to use playground-elements in a component-library monorepo and am struggling to get esbuild to work.

I get the _"Failed to construct 'URL'"_ error and struggled to figure this out for a couple hours until I finally found the Bundling documentation where it calls out the file in question within the [Other section](https://github.com/google/playground-elements#other). I updated my esbuild config to include the file in question via:

```js
config.addPassthroughCopy({ "node_modules/playground-elements/playground-typescript-worker.js": "playground-typescript-worker.js" })
```

It's in the same directory as my `main.js` file but I'm still getting the error.

When I noticed that webpack 5 has worker support builtin I thought I'd check esbuild and found [this web worker issue](https://github.com/evanw/esbuild/issues/312). I don't see any resolution in there and not sure if there's something else I should be doing or if esbuild isn't compatible at this time.

If anyone has any advice it'd be greatly appreciated.

Thanks