/**
 * WebXR Manager
 *
 * Handles VR session management, reference spaces, and the main XR loop.
 */
import { type WebXRFrameEvidence } from './WebXRFrameEvidence';
export type WebXRFrameCallback = (time: number, frame: XRFrame, evidence: WebXRFrameEvidence) => void;
export declare class WebXRManager {
    private session;
    private referenceSpace;
    private localReferenceSpace;
    private viewerReferenceSpace;
    private hitTestSource;
    private glContext;
    private onFrameCallback;
    onSessionStart: ((session: XRSession) => void) | null;
    onSessionEnd: (() => void) | null;
    constructor(context?: any);
    /**
     * Check if VR is supported
     */
    isSessionSupported(): Promise<boolean>;
    /**
     * Request an immersive VR session
     */
    requestSession(): Promise<XRSession>;
    /**
     * End the current session
     */
    endSession(): Promise<void>;
    private onSessionEnded;
    /**
     * Start the XR render loop
     */
    setAnimationLoop(callback: WebXRFrameCallback): void;
    private onXRFrame;
    /**
     * Collect passive WebXR hit-test and anchor evidence for XRFrameData fields.
     */
    collectFrameEvidence(time: number, frame: XRFrame): WebXRFrameEvidence;
    /**
     * Get the current reference space (prefer local-floor)
     */
    getReferenceSpace(): XRReferenceSpace | null;
    getSession(): XRSession | null;
    private initializeHitTestSource;
}
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