import { type Snippet } from 'svelte';
import type { XRSessionEvent } from '../types';
/**
 * `<XR />` is a WebXR manager that configures your scene for XR rendering and interaction.
 *
 * This should be placed within a Threlte `<Canvas />`.
 *
 * ```svelte
 * <XR
 *   foveation={1}
 *   frameRate={90}
 *   referenceSpace='local-floor'
 *   onsessionstart={(event: XREvent<XRManagerEvent>) => {}}
 *   onsessionend={(event: XREvent<XRManagerEvent>) => {}}
 *   onvisibilitychange={(event: XREvent<XRSessionEvent>) => {}}
 *   oninputsourceschange={(event: XREvent<XRSessionEvent>) => {}}
 * />
 * ```
 */
declare const Xr: import("svelte").Component<{
    /**
     * Enables foveated rendering. Default is `1`, the three.js default.
     *
     * 0 = no foveation, full resolution
     *
     * 1 = maximum foveation, the edges render at lower resolution
     */
    foveation?: number;
    /**
     * The target framerate for the XRSystem. Smaller rates give more CPU headroom at the cost of responsiveness.
     * Recommended range is `72`-`120`. Default is unset and left to the device.
     * @note If your experience cannot effectively reach the target framerate, it will be subject to frame reprojection
     * which will halve the effective framerate. Choose a conservative estimate that balances responsiveness and
     * headroom based on your experience.
     * @see https://developer.mozilla.org/en-US/docs/Web/API/WebXR_Device_API/Rendering#refresh_rate_and_frame_rate
     */
    frameRate?: number | undefined;
    /** Type of WebXR reference space to use. Default is `local-floor` */
    referenceSpace?: XRReferenceSpaceType;
    fallback?: Snippet;
    children?: Snippet;
    /** Called as an XRSession is requested */
    onsessionstart?: (event: XRSessionEvent<"sessionstart">) => void;
    /** Called after an XRSession is terminated */
    onsessionend?: (event: XRSessionEvent<"sessionend">) => void;
    /** Called when an XRSession is hidden or unfocused. */
    onvisibilitychange?: (event: globalThis.XRSessionEvent) => void;
    /** Called when available inputsources change */
    oninputsourceschange?: (event: globalThis.XRSessionEvent) => void;
}, {}, "">;
export default Xr;