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https://github.com/heygen-com/hyperframes.git
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Miguel Angel Simon Sierra
73865b3890
#3516 merged from a branch cut before da6514d45 and brought back
`expect(document).not.toHaveProperty("modelContext")`, along with the old
test title. This re-applies that fix.
The assertion is racy, not merely wrong. The hook awaits a dynamic import
of the `@mcp-b/global` polyfill inside its mount effect, so whether
`document.modelContext` exists when the assertion runs depends only on
whether that import has resolved yet. `await act()` usually returns first,
which is why main went green while another PR's run went red. Inserting a
100ms wait before the assertion on the current tip makes it fail every
time, and the failure dump shows all five tools registered through the
polyfill: the real behaviour is the opposite of what the line asserted.
Installing `document.modelContext` where the browser has none is the
polyfill's job. What the case is really for is that mounting does not
throw, so a browser without native WebMCP still boots Studio.
@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