import { type Simulation, type SimulationState } from './simulation';
/**
 * What the Animatable actually drives: anything that advances a
 * (position, velocity) state by fixed timesteps and knows when it is done.
 * Physics modes wrap a Simulation; the duration/easing escape hatch samples
 * a curve instead - same state shape, so handoff between modes is free.
 */
export interface Motion {
    step(state: SimulationState, timestepS: number): SimulationState;
    /** Settled position when the state qualifies as rest, null while moving. */
    rest(state: SimulationState): number | null;
}
/**
 * A Motion whose elapsed clock can be repositioned: the seek seam for duration
 * tweens and baked-spring tables. A live spring/decay is NOT seekable - it has
 * no fixed durationS - so simulationMotion stays a plain Motion.
 */
export interface SeekableMotion extends Motion {
    /** Reposition to an absolute elapsed time (seconds); returns the sample there. Next step() continues from it. */
    seek(elapsedS: number): SimulationState;
    /** Total elapsed at rest (seconds). Tweens: the duration. Sampled tables: the last entry. */
    readonly durationS: number;
}
export declare function simulationMotion(simulation: Simulation): Motion;
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