Demo of Parcel bug

Repro steps:

1. yarn build
2. yarn start
3. Go to http://localhost:3000

Expected behavior:

The text on the page is a URL to the built style.css, something like http://localhost:3000/style.41cfa6c5.css. Going to this URL returns the actual contents of style.css.

Actual behavior:

The text on the page is http://localhost:3000/9Lg9I. Going to this URL results in a 404.

Workaround:

1. Delete "src/b.js" from the sources list in package.json.
2. yarn clean (deletes output files and parcel cache)
3. Repeat the above repro steps.

Note on the setup: index.html is intentionally not included in the Parcel build, and is manually copied into the dist dir after building, so that Parcel doesn't touch the <script> tag. The bug only happens in the JS file built as its own entry, not in the version that gets built as a dependency of index.html.