import type { Keyframe } from "./keyframes.js";
import type { Easing } from "./easings.js";
export declare function sanitizeInterpolators(keyframes: any, interpolators: string | string[]): string[];
export declare function sanitizeEasings(keyframes: any, easings: Easing | Easing[]): Easing[];
export declare function sanitizeTimings(keyframes: any, timings: number | number[]): number[];
export declare function merge<T>(timings: number[], keyframes: T[], easings: Easing[], interpolators: string[]): Keyframe<T>[];
export declare function factorInterpolator(start: number, end: number, ease?: import("popmotion").Easing): (v: number) => number;
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