import type { UILayer } from "../../core";
import { UIAnchor } from "../../core/elements/UIAnchor/UIAnchor";
import type { UIAnchorOptions } from "../../core/elements/UIAnchor/UIAnchor.Internal";
import type { UIBehaviorModule } from "../behaviorModules/UIBehaviorModule";
import type { UIRenderingModule } from "../renderingModules/UIRenderingModule";
import type { UISpawnModule } from "../spawnModules/UISpawnModule";
import type { UIEmitterMode, UIEmitterPlayOptions } from "./UIEmitter.Internal";
export interface UIEmitterOptions extends UIAnchorOptions {
    mode: UIEmitterMode;
    expectedCapacity: number;
    capacityStep: number;
    automaticallyDestroyModules: boolean;
}
/**
 * Particle emitter element.
 *
 * Spawns, updates, and renders particles using modular spawn/behavior/rendering pipeline.
 */
export declare class UIEmitter extends UIAnchor {
    private readonly spawnSequence;
    private readonly behaviorSequence;
    private readonly renderingSequence;
    /** Whether to call destroy() on all modules when emitter is destroyed */
    automaticallyDestroyModules: boolean;
    private readonly mesh;
    private readonly catcherHandler;
    private emissionRate;
    private emissionAccumulator;
    private emissionDuration;
    private emissionElapsed;
    private modeInternal;
    /**
     * @param layer - Layer containing this emitter
     * @param spawnSequence - Modules that initialize new particles
     * @param behaviorSequence - Modules that update particles each frame
     * @param renderingSequence - Modules that control particle appearance
     * @param options - Configuration options
     */
    constructor(layer: UILayer, spawnSequence: UISpawnModule[], behaviorSequence: readonly UIBehaviorModule[], renderingSequence: readonly UIRenderingModule[], options?: Partial<UIEmitterOptions>);
    /** Visibility mode */
    get mode(): UIEmitterMode;
    /** Rendering order. Higher values draw on top */
    get zIndex(): number;
    /** Visibility mode */
    set mode(value: UIEmitterMode);
    /** Rendering order. Higher values draw on top */
    set zIndex(value: number);
    /** Removes emitter and optionally destroys modules */
    destroy(): void;
    /**
     * Spawns a specific number of particles immediately.
     *
     * @param count - Number of particles to create
     */
    burst(count: number): void;
    /** Removes all active particles */
    clear(): void;
    /**
     * Starts continuous particle emission.
     *
     * @param rate - Particles per second
     * @param options - Emission duration and other settings
     */
    play(rate: number, options?: Partial<UIEmitterPlayOptions>): void;
    /** Stops continuous particle emission */
    stop(): void;
    private readonly onRendering;
}