/**
 * Animates an element using keyframes. Returns a promise that resolves after the animation completes or gets canceled.
 */
export declare function animateTo(el: HTMLElement, keyframes: Keyframe[], options?: KeyframeAnimationOptions): Promise<unknown>;
/** Parses a CSS duration and returns the number of milliseconds. */
export declare function parseDuration(delay: number | string): number;
/** Tells if the user has enabled the "reduced motion" setting in their browser or OS. */
export declare function prefersReducedMotion(): boolean;
/**
 * Stops all active animations on the target element. Returns a promise that resolves after all animations are canceled.
 */
export declare function stopAnimations(el: HTMLElement): Promise<unknown[]>;
/**
 * We can't animate `height: auto`, but we can calculate the height and shim keyframes by replacing it with the
 * element's scrollHeight before the animation.
 */
export declare function shimKeyframesHeightAuto(keyframes: Keyframe[], calculatedHeight: number): {
    height: string | number | null | undefined;
    composite?: CompositeOperationOrAuto;
    easing?: string;
    offset?: number | null;
}[];
/**
 * 显示动画
 *
 *  await animateTo(this.contentElement,shimKeyframesHeightAuto(this.active ?animate_show:animate_hide,this.active?currentHeight:oldHeight), {
 *   duration: duration,
 *   easing: 'ease'
 * });
 */
export declare const animate_show: ({
    height: number;
    overflow: string;
} | {
    height: string;
    overflow: string;
})[];
/**
 * 隐藏动画
 */
export declare const animate_hide: ({
    height: string;
    overflow: string;
} | {
    height: number;
    overflow: string;
})[];