function ProviderViewModel(options) {
  //>>includeStart('debug', pragmas.debug);
  if (!defined(options.name)) {
    throw new DeveloperError("options.name is required.");
  }
  if (!defined(options.tooltip)) {
    throw new DeveloperError("options.tooltip is required.");
  }
  if (!defined(options.iconUrl)) {
    throw new DeveloperError("options.iconUrl is required.");
  }
  if (typeof options.creationFunction !== "function") {
    throw new DeveloperError("options.creationFunction is required.");
  }
  //>>includeEnd('debug');

  let creationCommand = options.creationFunction;
  if (!defined(creationCommand.canExecute)) {
    creationCommand = createCommand(creationCommand);
  }

  this._creationCommand = creationCommand;

  /**
   * Gets the display name.  This property is observable.
   * @type {string}
   */
  this.name = options.name;

  /**
   * Gets the tooltip.  This property is observable.
   * @type {string}
   */
  this.tooltip = options.tooltip;

  /**
   * Gets the icon.  This property is observable.
   * @type {string}
   */
  this.iconUrl = options.iconUrl;

  this._category = options.category ?? "";

  knockout.track(this, ["name", "tooltip", "iconUrl"]);
}
A view model that represents each item in the {@link BaseLayerPicker}.

@alias ProviderViewModel
@constructor

@param {object} options The object containing all parameters.
@param {string} options.name The name of the layer.
@param {string} options.tooltip The tooltip to show when the item is moused over.
@param {string} options.iconUrl An icon representing the layer.
@param {string} [options.category] A category for the layer.
@param {ProviderViewModel.CreationFunction|Command} options.creationFunction A function or Command
       that creates one or more providers which will be added to the globe when this item is selected.

@see BaseLayerPicker
@see ImageryProvider
@see TerrainProvider