How to use the @turf/helpers.bearingToAzimuth function in @turf/helpers

// Optional Parameters
    if (!isObject(options)) { throw new Error("options is invalid"); }

    // Validation
    if (!startPoint) { throw new Error("startPoint is required"); }
    if (!midPoint) { throw new Error("midPoint is required"); }
    if (!endPoint) { throw new Error("endPoint is required"); }

    // Rename to shorter variables
    const A = startPoint;
    const O = midPoint;
    const B = endPoint;

    // Main
    const azimuthAO = bearingToAzimuth((options.mercator !== true) ? bearing(A, O) : rhumbBearing(A, O));
    const azimuthBO = bearingToAzimuth((options.mercator !== true) ? bearing(B, O) : rhumbBearing(B, O));
    const angleAO = Math.abs(azimuthAO - azimuthBO);

    // Explementary angle
    if (options.explementary === true) { return 360 - angleAO; }
    return angleAO;
}

} = {}): number {
    // Optional Parameters
    if (!isObject(options)) { throw new Error("options is invalid"); }

    // Validation
    if (!startPoint) { throw new Error("startPoint is required"); }
    if (!midPoint) { throw new Error("midPoint is required"); }
    if (!endPoint) { throw new Error("endPoint is required"); }

    // Rename to shorter variables
    const A = startPoint;
    const O = midPoint;
    const B = endPoint;

    // Main
    const azimuthAO = bearingToAzimuth((options.mercator !== true) ? bearing(A, O) : rhumbBearing(A, O));
    const azimuthBO = bearingToAzimuth((options.mercator !== true) ? bearing(B, O) : rhumbBearing(B, O));
    const angleAO = Math.abs(azimuthAO - azimuthBO);

    // Explementary angle
    if (options.explementary === true) { return 360 - angleAO; }
    return angleAO;
}

function isParallel(segment1, segment2) {
    var slope1 = bearingToAzimuth(rhumbBearing(segment1[0], segment1[1]));
    var slope2 = bearingToAzimuth(rhumbBearing(segment2[0], segment2[1]));
    return slope1 === slope2;
}

function isParallel(segment1, segment2) {
    var slope1 = bearingToAzimuth(rhumbBearing(segment1[0], segment1[1]));
    var slope2 = bearingToAzimuth(rhumbBearing(segment2[0], segment2[1]));
    return slope1 === slope2;
}