import { Application } from './Application';
import { System } from './System';
export declare class SystemManager {
    _app: Application;
    private systems;
    constructor(app: Application);
    addSystem(system: System): void;
    removeSystem(system: System): void;
    getSystem(classConstruct: any): System;
    update(deltaTime: number): void;
    getSnapshots(): any[];
    destroy(): void;
}