chore: import upstream snapshot with attribution

2026-07-13 12:58:35 +08:00
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+---
+name: hyperframes-animejs
+description: Anime.js adapter patterns for HyperFrames. Use when writing Anime.js animations or timelines inside HyperFrames compositions, registering animations on window.__hfAnime, making Anime.js seek-driven and deterministic, or translating Anime.js examples into render-safe HyperFrames HTML.
+---
+
+# Anime.js for HyperFrames
+
+HyperFrames can seek Anime.js instances through its `animejs` runtime adapter. The composition owns the animation objects; HyperFrames owns the clock.
+
+## Contract
+
+- Create animations or timelines synchronously during composition initialization.
+- Set `autoplay: false` so Anime.js does not advance on its own clock.
+- Register every returned animation or timeline on `window.__hfAnime`.
+- Use finite durations and loop counts.
+- Avoid callbacks that mutate DOM based on wall-clock time, network state, or unseeded randomness.
+
+The adapter seeks every registered instance with `instance.seek(timeMs)`, where `timeMs` is HyperFrames time in milliseconds.
+
+## Basic Pattern
+
+```html
+<script src="https://cdn.jsdelivr.net/npm/animejs@4.0.2/lib/anime.iife.min.js"></script>
+<script>
+  const anim = anime({
+    targets: ".mark",
+    translateX: 280,
+    rotate: "1turn",
+    opacity: [0, 1],
+    duration: 1200,
+    easing: "easeOutExpo",
+    autoplay: false,
+  });
+
+  window.__hfAnime = window.__hfAnime || [];
+  window.__hfAnime.push(anim);
+</script>
+```
+
+## Timeline Pattern
+
+```html
+<script>
+  const tl = anime.timeline({
+    autoplay: false,
+    easing: "easeOutCubic",
+  });
+
+  tl.add({
+    targets: ".title",
+    translateY: [40, 0],
+    opacity: [0, 1],
+    duration: 650,
+  }).add(
+    {
+      targets: ".accent",
+      scaleX: [0, 1],
+      duration: 450,
+    },
+    250,
+  );
+
+  window.__hfAnime = window.__hfAnime || [];
+  window.__hfAnime.push(tl);
+</script>
+```
+
+## Module Builds
+
+If you use an ES module build, the adapter does not care how the instance was created. It only needs the returned object to expose `seek()`, `pause()`, and preferably `play()`:
+
+```html
+<script type="module">
+  import { animate } from "https://cdn.jsdelivr.net/npm/animejs/+esm";
+
+  const anim = animate(".chip", {
+    x: "18rem",
+    duration: 900,
+    autoplay: false,
+  });
+
+  window.__hfAnime = window.__hfAnime || [];
+  window.__hfAnime.push(anim);
+</script>
+```
+
+## Good Uses
+
+- Small SVG and DOM flourishes where Anime.js syntax is compact.
+- Imported Anime.js examples that can be made seek-driven.
+- Multiple independent micro-animations pushed into the same registry.
+
+Use GSAP for complex scene sequencing unless the user specifically asks for Anime.js. GSAP is still the primary HyperFrames authoring path.
+
+## Avoid
+
+- Leaving `autoplay` at the Anime.js default.
+- Depending on `anime.running` auto-discovery instead of explicit `window.__hfAnime.push(...)`.
+- Infinite loops. Compute a finite repeat count from the composition duration.
+- Building animations in timers, promises, event handlers, or after async asset loads.
+
+## Validation
+
+After editing a composition that uses Anime.js:
+
+```bash
+npx hyperframes lint
+npx hyperframes check
+```
+
+## Credits And References
+
+- HyperFrames adapter source: `packages/core/src/runtime/adapters/animejs.ts`.
+- Anime.js documentation for `autoplay`, `pause()`, and `seek()`: https://animejs.com/documentation/