/**
 * TransitionSystem.ts
 *
 * Pre-built UI transition patterns using the AnimationEngine.
 * Provides fade, scale, slide, and combined transitions.
 */
import { AnimationEngine, EasingFn } from './AnimationEngine';
export type TransitionDirection = 'in' | 'out';
export interface TransitionOptions {
    duration?: number;
    easing?: EasingFn;
    delay?: number;
    onComplete?: () => void;
}
export declare class TransitionSystem {
    private engine;
    constructor(engine?: AnimationEngine);
    getEngine(): AnimationEngine;
    /**
     * Fade in/out (opacity 0 <-> 1)
     */
    fade(nodeId: string, direction: TransitionDirection, setter: (opacity: number) => void, options?: TransitionOptions): void;
    /**
     * Scale in/out (scale 0 <-> 1)
     */
    scale(nodeId: string, direction: TransitionDirection, setter: (scale: number) => void, options?: TransitionOptions): void;
    /**
     * Slide from a direction (e.g., slide up from below)
     */
    slide(nodeId: string, direction: TransitionDirection, axis: 'x' | 'y' | 'z', distance: number, setter: (offset: number) => void, options?: TransitionOptions): void;
    /**
     * Combined: Scale + Fade (common for dialogs/menus)
     */
    popIn(nodeId: string, scaleSetter: (s: number) => void, opacitySetter: (o: number) => void, options?: TransitionOptions): void;
    /**
     * Combined: Scale + Fade out
     */
    popOut(nodeId: string, scaleSetter: (s: number) => void, opacitySetter: (o: number) => void, options?: TransitionOptions): void;
    /**
     * Update all transitions. Must be called every frame.
     */
    update(delta: number): void;
}
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