/**
 * WeatherSystem.ts
 *
 * Dynamic weather: types, transitions, intensity,
 * wind, and environmental effects.
 *
 * @module environment
 */
export type WeatherType = 'clear' | 'cloudy' | 'rain' | 'storm' | 'snow' | 'fog' | 'sandstorm';
export interface WeatherState {
    type: WeatherType;
    intensity: number;
    wind: {
        x: number;
        y: number;
        z: number;
        speed: number;
    };
    temperature: number;
    humidity: number;
    visibility: number;
    precipitation: number;
}
export interface WeatherTransition {
    from: WeatherType;
    to: WeatherType;
    duration: number;
    elapsed: number;
}
export declare class WeatherSystem {
    private current;
    private transition;
    private targetState;
    private listeners;
    private history;
    constructor(initial?: WeatherType);
    private createState;
    setWeather(type: WeatherType, transitionDuration?: number): void;
    setImmediate(type: WeatherType): void;
    setWind(x: number, y: number, z: number, speed: number): void;
    setTemperature(temp: number): void;
    update(dt: number): void;
    private lerp;
    onChange(listener: (state: WeatherState) => void): void;
    private notify;
    getState(): WeatherState;
    getType(): WeatherType;
    isTransitioning(): boolean;
    getTransitionProgress(): number;
    getHistory(): typeof this.history;
}
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