export declare const enum BackingMediaSourceType {
    /** A HTMLImageElement. */
    HTMLImageElement = 0,
    /** A HTMLVideoElement. */
    HTMLVideoElement = 1,
    /** A SVGImageElement. */
    SVGImageElement = 2,
    /** A VideoFrame. */
    VideoFrame = 3,
    /** A lazy-widgets AsyncImageBitmap */
    AsyncImageBitmap = 4,
    /**
     * Anything else that can be painted immediately and has size information
     * (HTMLCanvasElement, ImageBitmap, OffscreenCanvas). Note that this will be
     * the assumed type for invalid media and null.
     */
    Immediate = 5
}