Add typedef for TileArcGISRest source options

This was removed in 8b23a44f8f (inadvertently I think).

src/ol/source/TileArcGISRest.js

@@ -10,6 +10,47 @@ import TileImage from '../source/TileImage.js';
 import {hash as tileCoordHash} from '../tilecoord.js';
 import {appendParams} from '../uri.js';
 
+/**
+ * @typedef {Object} Options
+ * @property {ol.AttributionLike} [attributions] Attributions.
+ * @property {number} [cacheSize=2048] Cache size.
+ * @property {null|string} [crossOrigin] The `crossOrigin` attribute for loaded images.
+ * Note that you must provide a `crossOrigin` value if you are using the WebGL renderer
+ * or if you want to access pixel data with the Canvas renderer.  See
+ * {@link https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image}
+ * for more detail.
+ * @property {Object.<string,*>} [params] ArcGIS Rest parameters. This field is optional. Service defaults will be
+ * used for any fields not specified. `FORMAT` is `PNG32` by default. `F` is `IMAGE` by
+ * default. `TRANSPARENT` is `true` by default.  `BBOX, `SIZE`, `BBOXSR`,
+ * and `IMAGESR` will be set dynamically. Set `LAYERS` to
+ * override the default service layer visibility. See
+ * {@link http://resources.arcgis.com/en/help/arcgis-rest-api/index.html#/Export_Map/02r3000000v7000000/}
+ * for further reference.
+ * @property {ol.tilegrid.TileGrid} [tileGrid] Tile grid. Base this on the resolutions,
+ * tilesize and extent supported by the server.
+ * If this is not defined, a default grid will be used: if there is a projection
+ * extent, the grid will be based on that; if not, a grid based on a global
+ * extent with origin at 0,0 will be used.
+ * @property {ol.ProjectionLike} projection Projection.
+ * @property {number} [reprojectionErrorThreshold=0.5] Maximum allowed reprojection error (in pixels).
+ * Higher values can increase reprojection performance, but decrease precision.
+ * @property {ol.TileLoadFunctionType} [tileLoadFunction] Optional function to load a tile given a URL.
+ * The default is
+ * ```js
+ * function(imageTile, src) {
+ *   imageTile.getImage().src = src;
+ * };
+ * ```
+ * @property {string} [url] ArcGIS Rest service URL for a Map Service or Image Service. The
+ * url should include /MapServer or /ImageServer.
+ * @property {boolean} [wrapX=true] Whether to wrap the world horizontally.
+ * @property {number} [transition] Duration of the opacity transition for rendering.  To disable the opacity
+ * transition, pass `transition: 0`.
+ * @property {Array.<string>} urls ArcGIS Rest service urls. Use this instead of `url` when the ArcGIS
+ * Service supports multiple urls for export requests.
+ */
+
+
 /**
  * @classdesc
  * Layer source for tile data from ArcGIS Rest services. Map and Image
@@ -20,8 +61,7 @@ import {appendParams} from '../uri.js';
  *
  * @constructor
  * @extends {module:ol/source/TileImage~TileImage}
- * @param {olx.source.TileArcGISRestOptions=} opt_options Tile ArcGIS Rest
- *     options.
+ * @param {module:ol/source/TileArcGISRest~Options=} opt_options Tile ArcGIS Rest options.
  * @api
  */
 const TileArcGISRest = function(opt_options) {