getTilePixelSize(z, pixelRatio, projection) {
    const tileGrid = this.getTileGridForProjection(projection);
    const tilePixelRatio = this.getTilePixelRatio(pixelRatio);
    const tileSize = toSize(tileGrid.getTileSize(z), this.tmpSize);
    if (tilePixelRatio == 1) {
      return tileSize;
    }
    return scaleSize(tileSize, tilePixelRatio, this.tmpSize);
  }
@param {number} z Z.
@param {number} pixelRatio Pixel ratio.
@param {import("../proj/Projection.js").default} projection Projection.
@return {import("../size.js").Size} Tile size.