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James
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Run `fallow fix --auto-fixable` to remove `export` keywords from symbols fallow's reachability analysis identifies as unused. Keeps only the cases where the symbol is still referenced internally in its own file (so removing `export` doesn't surface a new oxlint `no-unused-vars` error). Result: fallow dead-code findings drop from 276 → 208 (68 fewer unused exports), with no behavior change — each symbol is still defined and used exactly the same way within its file. Reverted ~20 files where fallow's auto-fix would have created cascading "declared but never used" lint errors — those are cases where the symbol isn't used at all, and properly cleaning them up means deleting the declaration, not just dropping `export`. Better to land that as a separate, narrower PR rather than mixing it into a mechanical de-export. Also reverted four false positives where fallow missed real consumers: - `captureCost.ts` (renderOrchestrator has two separate import blocks from the same module; fallow only saw the first) - `propertyPanelHelpers.ts`, `domEditingLayers.ts` (real internal uses fallow's reachability missed) - `render.ts` (functions imported via `await import()` dynamic import, which fallow's static analysis doesn't follow) Test plan: bun run --filter '*' typecheck (clean), oxlint + oxfmt clean, cli/core/studio/engine vitest suites pass (335 + 917 + 576 + 605 tests).
@hyperframes/engine
Seekable web-page-to-video rendering engine built on Puppeteer and FFmpeg.
Framework-agnostic: works with GSAP, Lottie, Three.js, CSS animations, or any web content that implements the window.__hf seek protocol.
Install
npm install @hyperframes/engine
Requirements: Node.js >= 22, Chrome/Chromium (auto-downloaded by Puppeteer), FFmpeg
What it does
The engine opens your HTML composition in a headless Chrome instance, seeks frame-by-frame using Chrome's HeadlessExperimental.beginFrame API, captures screenshots, and encodes them into video with FFmpeg.
Key services
| Service | Description |
|---|---|
| browserManager | Launches and pools headless Chrome instances (chrome-headless-shell) |
| frameCapture | Manages capture sessions — seek, screenshot, buffer lifecycle |
| screenshotService | BeginFrame-based capture with CDP (Chrome DevTools Protocol) |
| chunkEncoder | FFmpeg encoding with chunked concat, GPU detection, faststart |
| streamingEncoder | Pipe frames to FFmpeg in real time (no intermediate PNGs on disk) |
| audioMixer | Parse <audio> elements and mix audio tracks via FFmpeg |
| videoFrameExtractor | Extract frames from <video> elements for compositing |
| parallelCoordinator | Split frame ranges across worker processes |
| fileServer | Serve local HTML files to the browser via Hono |
Usage
import {
acquireBrowser,
releaseBrowser,
createCaptureSession,
initializeSession,
captureFrame,
closeCaptureSession,
} from "@hyperframes/engine";
// 1. Launch browser
const browser = await acquireBrowser({ captureMode: "beginFrame" });
// 2. Open a capture session
const session = createCaptureSession({
browser: browser.browser,
url: "http://localhost:3000/my-composition.html",
width: 1920,
height: 1080,
fps: 30,
});
await initializeSession(session);
// 3. Capture frames
for (let i = 0; i < totalFrames; i++) {
await captureFrame(session, i, `/tmp/frames/frame-${i}.png`);
}
// 4. Clean up
await closeCaptureSession(session);
await releaseBrowser(browser);
Most users should use @hyperframes/producer or the hyperframes CLI instead of calling the engine directly.
Documentation
Full documentation: hyperframes.heygen.com/packages/engine
Related packages
@hyperframes/core— types, parsers, frame adapters@hyperframes/producer— high-level render pipeline built on this enginehyperframes— CLI