I'm hitting an issue where the VS Code extension playground won't load at all. Getting this error message in the extension window:

Unable to preload CSS for /assets/pdf-viewer.css
Error: Unable to preload CSS for /assets/pdf-viewer.css
    at HTMLLinkElement.<anonymous> (https://file+.vscode-resource.vscode-cdn.net/Users/ben/.cursor/extensions/boundary.baml-extension-0.215.2-darwin-arm64/dist/playground/dist/assets/index.js:21:3224)

Details: - Extension version:

0.215.2

- Editor: Cursor (VS Code fork) - OS: macOS 25.1.0 (darwin-arm64) - Error location: Playground webview fails to load due to CSS preload error What's happening: The playground webview is trying to preload

/assets/pdf-viewer.css

but failing, which prevents the entire playground from loading. This looks like a webview resource URI issue - the CSS file path probably isn't being properly converted using

webview.asWebviewUri()

or the file isn't accessible at that path. Impact: BLOCKING - The playground is unusable. Can't test BAML functions with PDF inputs at all, Steps to reproduce: 1. Open a BAML file with PDF inputs (e.g.,

function ExtractPaperContent(paper: pdf)

) 2. Try to open the playground 3. Playground fails to load 4. Check browser console (Developer Tools) - see the CSS preload error Workaround: None that I've found. Tried reloading window, reinstalling extension, clearing cache - nothing works.

Have you tried downgrading to 0.215.0 or 0.214.0

I was on 214.0 before and tried upgrading to fix the issue, neither worked

Hmm what about 0.214? Or even 0.210? I think maybe we have a regression if your file has pdf inputs

Yes CLI works

Ok we will take a look and see whats upnwith pdfs

Thanks! Nice of you to respond on the holidays

Fixed [here](https://github.com/BoundaryML/baml/pull/2876), was an issue with Vite: when bundling lazy loaded components it adds absolute paths to CSS files which don't work in VSCode/Electron.

Thanks! Sounds like it's not released yet, but looking forward to the next version with this included.

Yeah next release

i'll be doing a release tomorrow morning