getHeading() {
    return /** @type {number|undefined} */ (this.get(Property.HEADING));
  }
Get the heading as radians clockwise from North.
Note: depending on the browser, the heading is only defined if the `enableHighAccuracy`
is set to `true` in the tracking options.
@return {number|undefined} The heading of the device in radians from north.
@observable
@api