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* feat(studio): add drag-to-reorder in layers panel with z-index persistence Layers panel now sorts siblings by computed z-index (descending) to reflect visual stacking order. Users can drag layer rows to reorder them within a sibling group — on drop, sequential z-index values are assigned and persisted via the existing inline-style patch pipeline with a single preview reload. - sortLayersByZIndex: recursive sibling-group sort by computed z-index - useLayerDrag: pointer-capture drag gesture with 4px threshold, insertion indicator line, and depth-constrained sibling reorder - handleDomZIndexReorderCommit: batch z-index commit with coalesced undo entry and single skipRefresh=false on the final patch * fix(studio): harden layer drag-to-reorder edge cases - Guard drag initiation against locked compositions by checking data-timeline-locked ancestors in isLayerDraggable - Show not-allowed cursor and reduced opacity on non-draggable layer rows - Fire toast when attempting to drag a layer with no same-depth siblings - Preserve z-index spacing on reorder by redistributing existing values instead of flattening to sequential integers - Auto-set position:relative on unpositioned elements when z-index is applied so the stacking order actually takes visual effect - Add tests for isLayerDraggable (anonymous, id, selector, locked, free) * fix(studio): handle z-index ties in layer reorder + trim file sizes - Fall back to sequential z-index when any duplicates exist in the sibling set, not just when all values are identical — fixes silent no-op reorder when tied values preserve DOM-order stacking - Trim useDomEditSession.ts from 602 to 600 lines (CI file-size gate) * test(studio): add duplicate z-index tiebreak test for layer sorting Cover the [2, 1, 2] case where tied z-index values fall back to reverse DOM order — locks the hasDupes fix against regressions. * style(studio): fix oxfmt formatting in LayersPanel
@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