import type Camera2d from "./../camera/camera2d.ts";
import World from "../physics/world.js";
import type Renderer from "./../video/renderer.js";
import type { ApplicationSettings, ResolvedApplicationSettings } from "./settings.ts";
/**
 * The Application class is the main entry point for creating a melonJS game.
 * It initializes the renderer, creates the game world and viewport, registers DOM event
 * listeners (resize, orientation, scroll), and starts the game loop.
 *
 * The Application instance provides access to the core game systems:
 * - {@link Application#renderer renderer} — the active Canvas or WebGL renderer
 * - {@link Application#world world} — the root container for all game objects
 * - {@link Application#viewport viewport} — the default camera / viewport
 *
 * The app instance is automatically passed to {@link Stage#onResetEvent} and
 * {@link Stage#onDestroyEvent}, and is accessible from any renderable via
 * {@link Renderable#parentApp parentApp}.
 * @category Application
 * @example
 * // create a new melonJS Application
 * const app = new Application(800, 600, {
 *     parent: "screen",
 *     scaleMethod: "flex-width",
 *     renderer: 2, // AUTO
 * });
 *
 * // add objects to the world
 * app.world.addChild(new Sprite(0, 0, { image: "player" }));
 *
 * // access the viewport
 * app.viewport.follow(player, app.viewport.AXIS.BOTH);
 */
export default class Application {
    /**
     * the parent HTML element holding the main canvas of this application
     */
    parentElement: HTMLElement;
    /**
     * a reference to the active Canvas or WebGL renderer
     */
    renderer: Renderer;
    /**
     * the active stage "default" camera
     */
    viewport: Camera2d;
    /**
     * a reference to the game world, <br>
     * a world is a virtual environment containing all the game objects
     */
    world: World;
    /**
     * when true, all objects will be added under the root world container.<br>
     * When false, a `me.Container` object will be created for each corresponding groups
     * @default true
     */
    mergeGroup: boolean;
    /**
     * Last time the game update loop was executed. <br>
     * Use this value to implement frame prediction in drawing events,
     * for creating smooth motion while running game update logic at
     * a lower fps.
     */
    lastUpdate: DOMHighResTimeStamp;
    /**
     * true when this app instance has been initialized
     * @default false
     */
    isInitialized: boolean;
    /**
     * the given settings used when creating this application
     */
    settings: ResolvedApplicationSettings;
    /**
     * Specify whether to pause this app when losing focus
     * @default true
     * @example
     *  // keep the default game instance running even when losing focus
     *  app.pauseOnBlur = false;
     */
    pauseOnBlur: boolean;
    /**
     * Specify whether to unpause this app when gaining back focus
     * @default true
     */
    resumeOnFocus: boolean;
    /**
     * Specify whether to stop this app when losing focus
     * @default false
     */
    stopOnBlur: boolean;
    isDirty: boolean;
    isAlwaysDirty: boolean;
    frameCounter: number;
    frameRate: number;
    accumulator: number;
    accumulatorMax: number;
    accumulatorUpdateDelta: number;
    stepSize: number;
    private _onResize?;
    private _onOrientationChange?;
    private _onScroll?;
    updateDelta: number;
    lastUpdateStart: number | null;
    updateAverageDelta: number;
    /**
     * Create and initialize a new melonJS Application.
     * This is the recommended way to start a melonJS game.
     * @param width - The width of the canvas viewport
     * @param height - The height of the canvas viewport
     * @param options - The optional parameters for the application and default renderer
     * @throws {Error} Will throw an exception if it fails to instantiate a renderer
     * @example
     * const app = new Application(1024, 768, {
     *     parent: "game-container",
     *     scale: "auto",
     *     scaleMethod: "fit",
     *     renderer: 2, // AUTO
     * });
     */
    constructor(width: number, height: number, options?: Partial<ApplicationSettings> & {
        legacy?: boolean;
    });
    /**
     * init the game instance (create a physic world, update starting time, etc..)
     * @param width - The width of the canvas viewport
     * @param height - The height of the canvas viewport
     * @param options - The optional parameters for the application and default renderer
     */
    init(width: number, height: number, options?: Partial<ApplicationSettings>): void;
    /**
     * reset the game Object manager
     * destroy all current objects
     */
    reset(): void;
    /**
     * Specify the property to be used when sorting renderables for this application game world.
     * Accepted values : "x", "y", "z", "depth"
     * @see {@link World.sortOn}
     */
    get sortOn(): string;
    set sortOn(value: string);
    /**
     * Fired when a level is fully loaded and all renderable instantiated. <br>
     * Additionally the level id will also be passed to the called function.
     * @example
     * // call myFunction () everytime a level is loaded
     * app.onLevelLoaded = this.myFunction.bind(this);
     */
    onLevelLoaded(): void;
    /**
     * Update the renderer framerate using the system config variables.
     * @see {@link timer.maxfps}
     * @see {@link World.fps}
     */
    updateFrameRate(): void;
    /**
     * Returns the parent HTML Element holding the main canvas of this application
     * @returns the parent HTML element
     */
    getParentElement(): HTMLElement;
    /**
     * The HTML canvas element associated with this application's renderer.
     * @example
     * // access the canvas DOM element
     * const canvas = app.canvas;
     */
    get canvas(): HTMLCanvasElement;
    /**
     * Trigger a manual resize of the application canvas to fit the parent element.
     * This is automatically called on window resize/orientation change, but can
     * be called manually if the parent element size changes programmatically.
     * @example
     * // force a resize after changing the parent element dimensions
     * app.resize();
     */
    resize(): void;
    /**
     * Destroy this application instance and release all associated resources.
     * Removes the canvas from the DOM, destroys the world, and unregisters
     * all event listeners.
     * @param removeCanvas - if true, the canvas element is removed from the DOM (default: true)
     * @example
     * // clean up when done
     * app.destroy();
     */
    destroy(removeCanvas?: boolean): void;
    /**
     * force the redraw (not update) of all objects
     */
    repaint(): void;
    /** @ignore */
    _tick(time: number): void;
    /** @ignore */
    _onBlur(): void;
    /** @ignore */
    _onFocus(): void;
    /**
     * update all objects related to this game active scene/stage
     * @param time - current timestamp as provided by the RAF callback
     */
    update(time: number): void;
    /**
     * draw the active scene/stage associated to this game
     */
    draw(): void;
}
/**
 * The default game application instance.
 * Set via {@link setDefaultGame} during engine initialization.
 * When using {@link Application} directly, prefer using the app instance
 * (e.g. from {@link Stage#onResetEvent} or {@link Renderable#parentApp}).
 */
export declare let game: Application;
/**
 * Set the default game application instance.
 * @ignore
 */
export declare function setDefaultGame(app: Application): void;
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