declare type Constructor<T = object> = {
    new (...args: any[]): T;
    prototype: T;
};
declare type XRReferenceSpaceType = 'local' | 'local-floor' | 'bounded-floor' | 'unbounded' | 'viewer';
declare type XRSessionMode = 'inline' | 'immersive-ar' | 'immersive-vr';
declare interface XRPresentationContext {
    readonly canvas: HTMLCanvasElement;
}
declare interface XRHitTestSource {
    cancel(): void;
}
declare interface XRTransientInputHitTestSource {
    cancel(): void;
}
declare interface XRHitTestResult {
    getPose(baseSpace: XRSpace): XRPose | null;
}
declare interface XRTransientInputHitTestResult {
    readonly inputSource: XRInputSource;
    readonly results: Array<XRHitTestResult>;
}
declare interface XR extends EventTarget {
    requestSession(mode: XRSessionMode, options?: any): Promise<XRSession>;
    isSessionSupported(mode: XRSessionMode): Promise<boolean>;
}
declare interface XRRigidTransform {
    readonly position: DOMPointReadOnly;
    readonly orientation: DOMPointReadOnly;
    readonly matrix: Float32Array;
    readonly inverse: XRRigidTransform;
}
declare interface XRSpace extends EventTarget {
}
declare interface XRReferenceSpace extends XRSpace {
    getOffsetReferenceSpace(originOffset: XRRigidTransform): XRReferenceSpace;
}
declare type XREye = 'left' | 'right';
declare interface XRView {
    readonly eye: XREye;
    readonly projectionMatrix: Float32Array;
    readonly viewMatrix: Float32Array;
    readonly transform: XRRigidTransform;
    readonly recommendedViewportScale: number | null;
    requestViewportScale(scale: number | null): void;
}
declare interface XRViewerPose {
    readonly transform: XRRigidTransform;
    readonly views: Array<XRView>;
}
declare interface XRRayDirectionInit {
    x?: number;
    y?: number;
    z?: number;
    w?: number;
}
declare class XRRay {
    readonly origin: DOMPointReadOnly;
    readonly direction: XRRayDirectionInit;
    matrix: Float32Array;
    constructor(origin: DOMPointInit, direction: XRRayDirectionInit);
}
declare interface XRPose {
    readonly emulatedPosition: boolean;
    readonly transform: XRRigidTransform;
}
declare type XRHandedness = '' | 'left' | 'right';
declare type XRTargetRayMode = 'gaze' | 'tracked-pointer' | 'screen';
declare interface XRInputSource {
    readonly handedness: XRHandedness;
    readonly targetRayMode: XRTargetRayMode;
    readonly targetRaySpace: XRSpace;
    readonly gripSpace?: XRSpace;
    readonly profiles: Array<String>;
    readonly gamepad: Gamepad;
}
declare interface XRInputSourceEvent extends Event {
    readonly frame: XRFrame;
    readonly inputSource: XRInputSource;
}
declare interface XRFrame {
    readonly session: XRSession;
    getViewerPose(referenceSpace?: XRReferenceSpace): XRViewerPose;
    getPose(space: XRSpace, referenceSpace: XRReferenceSpace): XRPose;
    getHitTestResults(hitTestSource: XRHitTestSource): Array<XRHitTestResult>;
    getHitTestResultsForTransientInput(hitTestSource: XRTransientInputHitTestSource): Array<XRTransientInputHitTestResult>;
}
declare type XRFrameRequestCallback = (time: number, frame: XRFrame) => void;
declare interface XRRenderState {
    readonly depthNear: number;
    readonly depthFar: number;
    readonly inlineVerticalFieldOfView?: number;
    readonly baseLayer?: XRWebGLLayer;
}
declare interface XRRenderStateInit {
    depthNear?: number;
    depthFar?: number;
    inlineVerticalFieldOfView?: number;
    baseLayer?: XRWebGLLayer;
}
declare interface XRHitTestOptionsInit {
    space: XRSpace;
    offsetRay?: XRRay;
}
declare interface XRTransientInputHitTestOptionsInit {
    profile: string;
    offsetRay?: XRRay;
}
declare interface XRSession extends EventTarget {
    renderState: XRRenderState;
    updateRenderState(state?: XRRenderStateInit): any;
    requestReferenceSpace(type: XRReferenceSpaceType): Promise<XRReferenceSpace>;
    requestHitTestSource(options: XRHitTestOptionsInit): Promise<XRHitTestSource>;
    requestHitTestSourceForTransientInput(options: XRTransientInputHitTestOptionsInit): Promise<XRTransientInputHitTestSource>;
    inputSources: Array<XRInputSource>;
    requestAnimationFrame(callback: XRFrameRequestCallback): number;
    cancelAnimationFrame(id: number): void;
    end(): Promise<void>;
}
declare interface XRViewport {
    readonly x: number;
    readonly y: number;
    readonly width: number;
    readonly height: number;
}
declare interface XRLayer {
}
declare interface XRWebGLLayerInit {
    antialias?: boolean;
    depth?: boolean;
    stencil?: boolean;
    alpha?: boolean;
    ignoreDepthValues?: boolean;
    framebufferScaleFactor?: number;
}
declare class XRWebGLLayer implements XRLayer {
    framebuffer: WebGLFramebuffer;
    framebufferWidth: number;
    framebufferHeight: number;
    constructor(session: XRSession, gl: WebGLRenderingContext, options: XRWebGLLayerInit);
    getViewport(view: XRView): XRViewport;
}
declare interface Window {
    XRSession?: Constructor<XRSession>;
    XR?: Constructor<XR>;
}
declare interface Navigator {
    xr?: XR;
}
declare interface WebGLRenderingContext {
    makeXRCompatible(): Promise<void>;
}