import type { SpringParams } from './utils';
export type { SpringParams } from './utils';
/**
 * Options for a single spring animation run
 */
export interface SpringAnimationOptions {
    /** Starting position (px) */
    from: number;
    /** Target position (px) */
    to: number;
    /** Velocity at animation start (px/s), enables seamless gesture handoff */
    initialVelocity?: number;
    /** Physical spring constants */
    params: SpringParams;
    /** Called every frame with the current position */
    onFrame: (position: number) => void;
    /** Called once when the spring settles at the target */
    onSettle?: () => void;
}
/**
 * Spring animation driver for BootstrapSheet.
 *
 * Runs a requestAnimationFrame loop around the analytical spring solution.
 * Unlike easing-based animation, the spring has no fixed duration - it runs
 * until position and velocity settle below threshold. The initial velocity
 * enables seamless handoff from a gesture: the spring starts moving at the
 * same speed the finger was moving at release.
 *
 * The driver is DOM-agnostic: it only produces positions via `onFrame`;
 * applying them (transform, backdrop opacity, class names) is the caller's
 * responsibility.
 */
export default class SpringAnimator {
    #private;
    /** Whether an animation is currently in flight */
    get isRunning(): boolean;
    /**
     * Start a spring animation, canceling any previous one
     * @param options - Animation parameters and callbacks
     */
    start(options: SpringAnimationOptions): void;
    /**
     * Cancel the running animation (no-op when idle)
     */
    cancel(): void;
}
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