import { LightingState, LightingTransitionOptions, WeatherState } from '@rpgjs/common';
export declare function cloneWeatherState(weather: WeatherState | null): WeatherState | null;
export declare function interpolateNumber(from: number | undefined, to: number | undefined, progress: number): number | undefined;
export declare function easeLightingProgress(progress: number, easing: LightingTransitionOptions["easing"]): number;
export declare function interpolateLighting(from: LightingState, to: LightingState, progress: number): LightingState;