import { type SpringOptions } from '../physics/spring';
import type { Scheduler } from '../scheduler/scheduler';
import { type Animatable } from '../value/animatable';
export interface FollowOptions extends SpringOptions {
    /** The scheduler to run on; defaults to the shared rAF loop. */
    scheduler?: Scheduler;
}
export interface Follow {
    /** The tracking value: read get()/velocity(), subscribe on('change'). */
    readonly value: Animatable;
    /** Re-aim the spring at a moving target. Velocity is conserved; NO Motion rebuild. */
    target(next: number): void;
    /** Freeze the spring in place. */
    stop(): void;
    /** Stop and release the value and the frame subscription. */
    dispose(): void;
}
/**
 * A value that springs toward a moving target: the momentum-scrub seam for
 * scroll. The default config is critically damped, so a scrub never overshoots.
 * target() mutates the spring's aim in place rather than rebuilding the Motion,
 * so a per-frame scroll handler allocates nothing after construction.
 */
export declare function follow(initial: number, options?: FollowOptions): Follow;
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