import * as THREE from 'three';
import type { Application } from './Application';
export declare abstract class Helper<T> {
    protected _type: string;
    protected _app: Application;
    protected _helperMap: Map<string, T>;
    group: THREE.Group;
    constructor(type: string);
    setApp(app: Application): void;
    abstract onAdded(): Promise<any>;
    abstract onRemoved(): void;
    abstract initializeHandler(helperName: string): void;
    abstract updateHandler(deltaTime: number, helperName: string): void;
    abstract onDetach(helperName: string): void;
    protected getHelperObject(helperName: string): T;
    protected addModelToGroup(helperName: string, model: THREE.Mesh | THREE.Line | THREE.Object3D): void;
    protected getModelFromGroup(helperName: string): THREE.Object3D<THREE.Object3DEventMap>;
    getHelperNameByModel(model: any): any;
    has(helperName: string): boolean;
    attach(helperName: string, helperObject: T): void;
    detach(helperName: string): void;
    clearHelperObjects(): void;
    update(deltaTime: number): void;
    destroy(): void;
    getSnapshot(): {
        _t: string;
        _l: any[];
    };
}