Alias/ignoring node modules or node specific files similar to browser field in package.json

I haven't looked through the full dependency graph for this but am running into:

> playground-typescript-worker.js:37 Error fetching fs@0.0.1-security/index.js from CDN: CDN HTTP 404 error
> playground-typescript-worker.js:37 Error fetching child_process@1.0.2/index.js from CDN: CDN HTTP 404 error

with

```
import * as deckgl from 'deck.gl';
```

[demo](https://lit.dev/playground/#project=W3sibmFtZSI6InNpbXBsZS1ncmVldGluZy50cyIsImNvbnRlbnQiOiJpbXBvcnQgKiBhcyBkZWNrZ2wgZnJvbSAnZGVjay5nbCc7XG5cbiJ9LHsibmFtZSI6ImluZGV4Lmh0bWwiLCJjb250ZW50IjoiPCFET0NUWVBFIGh0bWw-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)

Happens in 0.14.8 and 0.15.1.

This is probably fixable upstream? Not sure where though.