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Vance IngallsandClaude Opus 5
ac0e372474
Three violations of the repo's "avoid `any`/`as T`" rule and the standing
no-`!` rule, all in the carve's analysis path.
`resolveAutomationRange` cast to `HfAudioFxNumberParam` immediately after
`if (!param || param.kind !== "number") return null` — the discriminated union
was already narrowed, so the cast asserted what the compiler knew. Removing it
leaves tsc clean, which is the proof it was dead.
`analyse` read `doc!.baseURI` and `el.getAttribute("src")!`, and laundered
`getElementById`'s `HTMLElement | null` through `as HTMLAudioElement | null`
into a predicate that only checked for a `src` attribute — so the "is this an
audio element" claim was never actually tested by anything. The document is now
guarded once at the top, and the voices are read out to `{ src, start }` values
as they are found, which makes both fields non-null by construction rather than
by assertion.
The element check is by `tagName`, not `instanceof HTMLAudioElement`: these
elements belong to the composition's iframe document, so this realm's
constructor never matches them. It is not a narrowing either — `sourceOptions`
is built from `doc.querySelectorAll("audio[id]")`, so a carve source is an
`<audio>` element by construction.
No behaviour change, so no new test. The path is covered: forcing the voice
collection to yield nothing fails 8 existing tests.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
@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