import { Object3D } from "three";
import ThreeMeshUI from "three-mesh-ui";
import { FrameEvent } from "../../engine/engine_setup.js";
import { Behaviour } from "../Component.js";
import { BaseUIComponent } from "./BaseUIComponent.js";
export declare function tryGetUIComponent(obj: Object3D): BaseUIComponent | null;
export declare function isUIObject(obj: Object3D): boolean;
export type RenderSettings = {
    renderOnTop?: boolean;
    doubleSided?: boolean;
    depthWrite?: boolean;
    castShadows?: boolean;
    receiveShadows?: boolean;
};
export declare function updateRenderSettings(shadowComponent: Object3D | ThreeMeshUI.MeshUIBaseElement, settings: RenderSettings): void;
export declare type RevocableProxy = {
    proxy: any;
    revoke: () => void;
};
/** internal method to proxy a field to detect changes */
/**@deprecated use watcher instead */
export declare function onChange<T extends object>(caller: T, field: string, callback: (newValue: any, oldValue: any) => void): RevocableProxy;
/** internal method to schedule a function at a specific moment in the update loop */
export declare function scheduleAction(caller: Behaviour, action: Function, timing?: FrameEvent): void;