import type { IStateReducer } from "./PlainObjectReducer";
export type EasingFunction = (t: number) => number;
export type TAdditiveTweeningOptions<T extends Record<string, number>> = {
    onRender: (state: T) => void;
    onFinish?: (finalState: T) => void;
    onCancel?: () => void;
    stateReducer?: IStateReducer<T>;
};
export declare class AdditiveTweening<T extends Record<string, number>> {
    tween: (fromState: T, toState: T, duration: number, easing?: EasingFunction) => void;
    isTweening: () => boolean;
    finish: () => void;
    cancel: () => void;
    constructor(options: TAdditiveTweeningOptions<T>);
    scheduleAnimationFrame(cb: () => void): number;
    _now: () => number;
    now(): number;
}