import type { RectangleLike } from '../../math';
import type { GlRenderer } from './GlRenderer';
import { Aabb2D } from '../../math';
import { GlSystem } from './system';
export declare class GlViewportSystem extends GlSystem {
    readonly current: Aabb2D;
    install(renderer: GlRenderer): void;
    bind(rect: RectangleLike): void;
}