Function track

track<T extends Animatable>(config: TrackConfig<T>): Track<T>
Declares an animation once and samples it per page.

Tracks work in seconds because that is what duration and fps already speak, and because a delay expressed as a fraction of the whole sequence changes meaning whenever the sequence length changes. index folds in the stagger, so a row of bars is one track rather than per-item arithmetic at the call site.
Type Parameters
- T extends Animatable
Parameters
- config: TrackConfig<T>
Returns Track<T>
Example
```
const grow = track({ from: 0, to: 1, duration: 0.75, delay: 0.1, stagger: 0.18, ease: 'outCubic' })

await Root({
  width: 640,
  height: 320,
  duration: grow.totalDuration(3),
  fps: 24,
  children: page => Row({ children: BARS.map((bar, i) => Box({ width: 300 * grow.at(page, i) })) }),
})
```
- Defined in src/animate/track.ts:54