/**
 * SpringAnimator.ts
 *
 * Physics-based spring dynamics for smooth, natural-feeling animations.
 * Implements a critically-damped spring model for responsive UI motion.
 */
export interface SpringConfig {
    stiffness: number;
    damping: number;
    mass: number;
    precision: number;
}
export declare const SpringPresets: Record<string, SpringConfig>;
export declare class SpringAnimator {
    private current;
    private target;
    private velocity;
    private config;
    private atRest;
    private onUpdate?;
    private onRest?;
    constructor(initialValue: number, config?: Partial<SpringConfig>, onUpdate?: (value: number) => void, onRest?: () => void);
    /**
     * Set a new target value. The spring will animate towards it.
     */
    setTarget(target: number): void;
    /**
     * Instantly jump to a value (no animation).
     */
    setValue(value: number): void;
    /**
     * Apply an impulse (instant velocity change).
     */
    impulse(force: number): void;
    /**
     * Step the spring simulation forward.
     * Uses semi-implicit Euler integration.
     */
    update(delta: number): number;
    /**
     * Get current value.
     */
    getValue(): number;
    /**
     * Check if the spring has settled.
     */
    isAtRest(): boolean;
    /**
     * Change spring configuration dynamically.
     */
    setConfig(config: Partial<SpringConfig>): void;
}
export declare class Vec3SpringAnimator {
    x: SpringAnimator;
    y: SpringAnimator;
    z: SpringAnimator;
    constructor(initial: [number, number, number], config?: Partial<SpringConfig>, onUpdate?: (value: [number, number, number]) => void);
    setTarget(target: [number, number, number]): void;
    update(delta: number): [number, number, number];
    getValue(): [number, number, number];
    isAtRest(): boolean;
}
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