getCoordinateFromPixelInternal(pixel) {
    const frameState = this.frameState_;
    if (!frameState) {
      return null;
    }
    return applyTransform(frameState.pixelToCoordinateTransform, pixel.slice());
  }
Get the coordinate for a given pixel.  This returns a coordinate in the
map view projection.
@param {import("./pixel.js").Pixel} pixel Pixel position in the map viewport.
@return {import("./coordinate.js").Coordinate} The coordinate for the pixel position.