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Vance Ingalls
cb0b17062a
## Summary - **New skill:** **`marker-highlight`** — integrates [MarkerHighlight.js](https://github.com/Robincodes-Sandbox/marker-highlight) into HyperFrames compositions. Canvas-based animated text highlighting with 5 drawing modes: marker pen, circle, burst, scribble, and sketchout. - **Studio fix:** added missing `captionSync` to useEffect dependency array (oxlint exhaustive-deps) - **Studio fix:** `loadOverrides` now checks `res.ok` before parsing, preventing 404 console noise on projects without captions ## Skill details The skill documents the non-obvious GSAP integration pattern discovered during development: 1. **One highlighter per container** — the library clears ALL `.highlight` divs from the shared parent on init, so multiple instances on sibling marks conflict 2. **`data-color`** **\+** **`data-original-bgcolor`** — prevents the CSS background-color flash that occurs when the library reads and clears the mark's background 3. **Canvas pre-draw + clear + reanimate** — `animate: false` pre-draws statically, canvases are hidden, then cleared and shown with `reanimateMark()` at trigger time for clean animated reveals 4. **`onReverseComplete`** **for rewind** — hides highlight divs when the timeline seeks backward past the trigger point ## Test plan - [ ] `npx hyperframes lint` passes on test-composition - [ ] Studio preview shows marker highlight on "something" at 1s, circle on "love" at 2.2s - [ ] Rewind past trigger points hides highlights - [ ] No 404 console errors for caption-overrides.json on non-caption projects [Screen Recording 2026-04-02 at 1.56.30 AM.mov <span class="graphite__hidden">(uploaded via Graphite)</span> <img class="graphite__hidden" src="https://app.graphite.com/user-attachments/thumbnails/53b03f4e-538e-477a-b738-7a033b99a84e.mov" />](https://app.graphite.com/user-attachments/video/53b03f4e-538e-477a-b738-7a033b99a84e.mov) 🤖 Generated with [Claude Code](https://claude.com/claude-code)
@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