/** Utility functions with legacy browser fallbacks */
export declare function now(): number;
export declare function requestFrame(callback: FrameRequestCallback): number;
export declare function cancelFrame(id: number): void;
export declare function clamp(value: number, min: number, max: number): number;
export declare function lerp(a: number, b: number, t: number): number;
export declare function degToRad(deg: number): number;
export declare function radToDeg(rad: number): number;
export declare function uid(prefix?: string): string;
export { type RgbaColor, tryParseColor, parseColor, colorWithAlpha, mixColors, interpolateColor, isCssColorString, } from './color';
export declare function resolveContainer(container: string | HTMLElement): HTMLElement;
export declare function getPixelRatio(): number;
export declare function merge<T extends Record<string, unknown>>(target: T, ...sources: Partial<T>[]): T;
export declare function shallowEqual(a: Record<string, unknown>, b: Record<string, unknown>): boolean;
/** Object pool for reducing GC pressure */
export declare class ObjectPool<T> {
    private pool;
    private factory;
    private reset;
    constructor(factory: () => T, reset: (obj: T) => void, initialSize?: number);
    acquire(): T;
    release(obj: T): void;
}
/** 2D matrix for transforms */
export declare class Matrix2D {
    a: number;
    b: number;
    c: number;
    d: number;
    e: number;
    f: number;
    identity(): this;
    translate(x: number, y: number): this;
    scale(sx: number, sy: number): this;
    rotate(angleRad: number): this;
    skew(skewX: number, skewY: number): this;
    multiply(other: Matrix2D): this;
    transformPoint(x: number, y: number): {
        x: number;
        y: number;
    };
    invert(): Matrix2D | null;
    /** Invert into an existing matrix (avoids allocation when paired with pool). */
    invertInto(out: Matrix2D): Matrix2D | null;
    copyFrom(other: Matrix2D): this;
    toCSS(): string;
}
/** Shared matrix pool for hit testing hot paths */
export declare const matrixPool: ObjectPool<Matrix2D>;
export declare function detectBestRenderer(): 'canvas' | 'svg' | 'html';