/**
 * CameraEffects.ts
 *
 * Post-camera effects: screen shake, zoom pulses, flash,
 * letterbox, split-screen, and vignette overlays.
 *
 * @module camera
 */
export type EffectType = 'shake' | 'zoom' | 'flash' | 'letterbox' | 'vignette' | 'fade';
export interface ActiveEffect {
    id: string;
    type: EffectType;
    duration: number;
    elapsed: number;
    intensity: number;
    params: Record<string, unknown>;
    active: boolean;
}
export interface ShakeParams {
    frequency: number;
    decay: number;
}
export interface ZoomParams {
    targetZoom: number;
    easeBack: boolean;
}
export interface FlashParams {
    color: {
        r: number;
        g: number;
        b: number;
    };
}
export interface LetterboxParams {
    ratio: number;
}
export interface FadeParams {
    fadeIn: boolean;
    color: {
        r: number;
        g: number;
        b: number;
    };
}
export declare class CameraEffects {
    private effects;
    private shakeOffset;
    private zoomMultiplier;
    private flashAlpha;
    private flashColor;
    private letterboxAmount;
    private vignetteIntensity;
    private fadeAlpha;
    shake(duration: number, intensity?: number, frequency?: number, decay?: number): string;
    zoomPulse(duration: number, targetZoom?: number, easeBack?: boolean): string;
    flash(duration?: number, color?: {
        r: number;
        g: number;
        b: number;
    }, intensity?: number): string;
    letterbox(duration: number, ratio?: number): string;
    vignette(duration: number, intensity?: number): string;
    fade(duration: number, fadeIn?: boolean, color?: {
        r: number;
        g: number;
        b: number;
    }): string;
    private addEffect;
    update(dt: number): void;
    getShakeOffset(): [number, number];
    getZoomMultiplier(): number;
    getFlashAlpha(): number;
    getFlashColor(): {
        r: number;
        g: number;
        b: number;
    };
    getLetterboxAmount(): number;
    getVignetteIntensity(): number;
    getFadeAlpha(): number;
    getActiveEffectCount(): number;
    cancelEffect(id: string): boolean;
    cancelAll(): void;
}
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