[BUG] knownEntryPoints is broken since snowpack@3.3.3

Bug Report Quick Checklist

• I am on the latest version of Snowpack & all plugins.
• I use package manager npm.
• I run Snowpack on OS Linux.
• I run Snowpack on Node.js v15

Describe the bug

Using snowpack@3.3.3, packageOptions.knownEntryPoints is being ignored (in my case it is 'react/jsx-runtime')

To Reproduce

We can’t fix bugs that we can’t see for ourselves. Issues often need to be closed if this section is skipped.

1. Clone this repo amankkg/snowpack-typescript-react17 (it has snowpack@3.3.3 as dependency)
2. Run npm start
3. Open an app at http://localhost:8080
4. See an error: Uncaught ReferenceError: React is not defined

To Reproduce expected behavior

1. Install snowpack@3.3.2 by running npm i snowpack@3.3.2
2. Run npm start
3. See app executed 'Hello World!'

Expected behavior

An app renders 'Hello World!' with snowpack@3.3.3

[amankkg]

I can confirm it’s fixed with snowpack@3.3.4 👍 thanks @matthewp

[matthewp]

Found the bug. Turns out it wasn’t related to knownEntrypoints, it was not using the result of Babel. Working on a test now, hope to have a patch out later today.