Experimental: this low-level package is intended for deliberate engine and custom-motion work.

pnpm add @liquidify/motion

The package has no React dependency. Its public API includes:

• stepSpring and isSettled for pure damped-spring calculations;
• createScheduler for an injectable request-animation-frame scheduler;
• getSharedScheduler for the process-wide lazy scheduler used by the glass engine;
• the related state, parameter, callback, and scheduler types.

import { isSettled, stepSpring, type SpringState } from "@liquidify/motion"

let state: SpringState = { value: 0, velocity: 0 }
state = stepSpring(state, 1, 1 / 60, {
  stiffness: 240,
  damping: 28,
})

if (isSettled(state, 1)) {
  state = { value: 1, velocity: 0 }
}

stepSpring accepts delta time in seconds and clamps long frame gaps internally. Prefer the shared scheduler when multiple surfaces animate in one document; use createScheduler when an isolated or test-injected clock is part of your architecture.