import { Game2D } from '../../core/2d';
import { System2D } from './system.2d';
/**
 * Built-in concrete 2D Collision System, handling the collision testing of two dimensional Entities which are capable of colliding with one
 *   another
 *
 * To be eligible for collision, an Entity must have a Transform2D and a BoxCollider2D
 */
export declare class Collision2D extends System2D {
    /** Provide the System's name */
    readonly name = "Collision2D";
    /** Simple array of `id-id` collision strings, used for tracking Entity-Entity collisions and invoking correct collision callbacks */
    private collisions;
    /**
     * Concrete tick lifecycle method implementing the Collision System's per-frame functionality
     *
     * Check for collision between all eligible Entities and call their collision handling methods as appropriate
     *
     * @param game the Game2D the System is running within
     */
    tick(game: Game2D): void;
    /**
     * Actual collision detection method. Just checks whether the BoxColliders of the two entities, positioned correctly, overlap
     *
     * @param e1 the first Entity
     * @param e2 the second Entity
     *
     * @returns a boolean indicating whether or not the two Entities collide
     */
    private collides;
}