Interface MediaTrackCapabilities

interface MediaTrackCapabilities {
    aspectRatio?: DoubleRange;
    autoGainControl?: boolean[];
    backgroundBlur?: boolean[];
    channelCount?: ULongRange;
    deviceId?: string;
    displaySurface?: string;
    echoCancellation?: boolean[];
    facingMode?: string[];
    frameRate?: DoubleRange;
    groupId?: string;
    height?: ULongRange;
    noiseSuppression?: boolean[];
    sampleRate?: ULongRange;
    sampleSize?: ULongRange;
    width?: ULongRange;
}