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L4 polish for the stacking-layer timeline: - Sub-composition layers group under a slim "Inside: <comp>" header with a green accent, so it reads that restacking there is scoped to that context. - Audio clips render in a distinct bottom lane: separator border, muted row bg, music glyph in the gutter, beat strip — clearly not part of the z-order stack. - During a vertical drag, a drop affordance shows join-vs-insert: an "onto" target highlights the row (join that layer / same z); "between"/"above"/ "below" shows an insertion line (new layer here). New pure helper timelineDropIndicator.ts (+ test) maps placement -> indicator; row-group rendering extracted into TimelineLayerGroupHeader / TimelineLayerGutter / TimelineDropInsertionLine / TimelineDragGhost to keep files under the 600 cap.
@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