Vance IngallsandClaude Sonnet 5.5
38f6e01c2b
Tooling and logs need more than "off". Give the runtime's report a reason code for every way blur can be off (renderer-off, unsupported-browser, each html-in-canvas defect, capture-failures), and two calls for tooling: probe() runs the same scan a render would, without painting, and suspend() stops all painting for the rest of a session without changing the reported decision. The engine prints one line per session from what the page reports: `[motion-blur] on reasonCode=null movers=N failedFrames=K`. The first-frame line cannot know about later failures, so the session end prints the same line with "(session end)" when any frame fell back to plain DOM; a clean session stays quiet. A render where every capture failed no longer reads as "on" with nothing else. Add the first test that reads blurred pixels: real Chrome with html-in-canvas, the engine's frame order (seek, wait, composite, screenshot). It checks the trail along the motion line, that what does not move matches the sharp frame, that a box centered with translate is blurred where it really is, and that a flipped backface card renders the plain frame. It skips when Chrome or html-in-canvas is missing. Folded review fixes: R13 (runtime half), R17 (engine half), T1 (the guards that need reason codes), T3 (log-line and pixel tests). Co-authored-by: Claude Sonnet 5.5 <noreply@anthropic.com>
@hyperframes/core
Types, parsers, generators, compiler, linter, runtime, and frame adapters for the Hyperframes video framework.
Install
npm install @hyperframes/core
Most users don't need to install core directly — the CLI, producer, and studio packages depend on it internally.
What's inside
| Module | Description |
|---|---|
| Types | TimelineElement, CompositionSpec, Asset, canvas dimensions, defaults |
| Parsers | parseHtml — extract timeline elements from HTML; parseGsapScript — parse GSAP animations |
| Generators | generateHyperframesHtml — produce valid Hyperframes HTML from a composition spec |
| Compiler | compileTimingAttrs — resolve data-start / data-duration into absolute times |
| Linter | lintHyperframeHtml — validate Hyperframes HTML (missing attributes, overlapping tracks, etc.) |
| Runtime | IIFE script injected into the browser — manages seek, media playback, and the window.__hf protocol |
| Frame Adapters | Pluggable animation drivers (GSAP, Lottie, CSS, or custom) |
Generated composition trust
Composition generators require trusted authors for code-bearing inputs. styles and
generateHyperframesStyles preserve authored CSS, which can load external resources.
animations may contain __raw: values that are emitted as JavaScript;
includeScripts: true includes executable timeline code. serializeGsapAnimations
also accepts raw preamble, postamble, and a code-bearing timelineVar. Never fill
these inputs with untrusted data. Attribute encoding and closing-tag containment
are not a sandbox; render untrusted compositions in an appropriately isolated
execution environment and never serve them on a privileged origin.
Text content retains the supported inline-formatting sanitizer contract. The clip parser intentionally flattens inner formatting to text, so parse/generate is not a lossless replacement for editing the source HTML.
Frame Adapters
A frame adapter tells the engine how to seek your animation to a specific frame:
import { createGSAPFrameAdapter } from "@hyperframes/core";
const adapter = createGSAPFrameAdapter({
getTimeline: () => gsap.timeline(),
compositionId: "my-video",
});
Implement FrameAdapter for custom animation runtimes:
import type { FrameAdapter } from "@hyperframes/core";
const myAdapter: FrameAdapter = {
id: "my-adapter",
getDurationFrames: () => 300,
seekFrame: (frame) => {
/* seek your animation */
},
};
Parsing and generating HTML
import { parseHtml, generateHyperframesHtml } from "@hyperframes/core";
const { elements, metadata } = parseHtml(htmlString);
const html = generateHyperframesHtml(spec);
Linting
import { lintHyperframeHtml } from "@hyperframes/core/lint";
const result = lintHyperframeHtml(htmlString);
// result.findings: { severity, message, elementId }[]
Documentation
Full documentation: hyperframes.heygen.com/packages/core
Related packages
@hyperframes/engine— rendering engine that drives the browser@hyperframes/producer— full render pipeline (capture + encode)hyperframes— CLI