export declare const StartOfAnimationSymbol: unique symbol;
export declare const EndOfAnimationSymbol: unique symbol;
export declare function getEasedRatioForTime(docTimeMs: number, props: {
    startTime: number;
    pauseTime: number | null;
    animDuration: number;
    loop: boolean;
    pingPong: boolean;
    pingPongDelay: number;
    easing: string;
}): [typeof StartOfAnimationSymbol | number | typeof EndOfAnimationSymbol, number];
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