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Timeline move, delete, and asset-drop operations were looping over every clip in the file and writing style="z-index: N" derived from an inverted data-track-index mapping. This silently overrode the author's CSS z-index — contradicting the documented contract that data-track-index does not affect visual layering — and persisted the corruption in the source HTML. Remove the z-index injection loops from all three timeline commit paths. Move and delete now only patch timing/track attributes on the affected clip. Asset drop still sets z-index on the newly created element via the generated HTML, without touching existing clips. Delete the now-unused buildTrackZIndexMap helper. Also fix patchInlineStyleInTag to handle self-closing void elements: the old code produced malformed `<img ... / style="z-index: 7">` because it didn't account for the trailing `/` before appending the style attribute. Closes #958
@hyperframes/studio
Browser-based composition editor UI for Hyperframes. Provides a visual timeline, code editor, and live preview for building video compositions.
Install
npm install @hyperframes/studio
What it does
The studio is a React application with:
- Visual timeline — drag, resize, and arrange elements on tracks
- Code editor — edit HTML and GSAP scripts with CodeMirror (syntax highlighting, autocomplete)
- Live preview — see changes in real time as you edit
- Composition inspector — view and modify element properties
Development
The studio is embedded in the hyperframes preview command. To develop the studio UI itself:
cd packages/studio
bun run dev # Start Vite dev server
bun run build # Build for production
bun run typecheck # Type-check
Tech stack
- React 18/19, Zustand (state management)
- CodeMirror 6 (editor)
- Tailwind CSS (styling)
- Vite (bundler)
- Phosphor Icons
Documentation
Full documentation: hyperframes.heygen.com/packages/studio
Related packages
@hyperframes/core— types and parsers used by the editorhyperframes— CLI that serves the studio viahyperframes preview