sources and layers.

src/ol/layer/Base.js

@@ -8,6 +8,11 @@ import {assert} from '../asserts.js';
 import {assign} from '../obj.js';
 import {clamp} from '../math.js';
 
+/**
+ * @typedef {import("../ObjectEventType").Types|'change:extent'|'change:maxResolution'|'change:maxZoom'|
+ *    'change:minResolution'|'change:minZoom'|'change:opacity'|'change:visible'|'change:zIndex'} BaseLayerObjectEventTypes
+ */
+
 /**
  * @typedef {Object} Options
  * @property {string} [className='ol-layer'] A CSS class name to set to the layer element.
@@ -47,6 +52,12 @@ class BaseLayer extends BaseObject {
   constructor(options) {
     super();
 
+    /***
+     * @type {import("../Observable").OnSignature<import("../Observable").EventTypes, import("../events/Event.js").default> &
+     *   import("../Observable").OnSignature<BaseLayerObjectEventTypes, import("../Object").ObjectEvent>}
+     */
+    this.on;
+
     /**
      * @type {Object<string, *>}
      */

src/ol/layer/BaseTile.js

@@ -61,6 +61,14 @@ class BaseTileLayer extends Layer {
     delete baseOptions.useInterimTilesOnError;
     super(baseOptions);
 
+    /***
+     * @type {import("../Observable").OnSignature<import("../Observable").EventTypes, import("../events/Event.js").default> &
+     *   import("../Observable").OnSignature<import("./Base").BaseLayerObjectEventTypes|
+     *     'change:source'|'change:preload'|'change:useInterimTilesOnError', import("../Object").ObjectEvent> &
+     *   import("../Observable").OnSignature<import("../render/EventType").LayerRenderEventTypes, import("../render/Event").default>}
+     */
+    this.on;
+
     this.setPreload(options.preload !== undefined ? options.preload : 0);
     this.setUseInterimTilesOnError(
       options.useInterimTilesOnError !== undefined

src/ol/layer/Layer.js

@@ -96,6 +96,14 @@ class Layer extends BaseLayer {
 
     super(baseOptions);
 
+    /***
+     * @type {import("../Observable").OnSignature<import("../Observable").EventTypes, import("../events/Event.js").default> &
+     *   import("../Observable").OnSignature<import("./Base").BaseLayerObjectEventTypes|
+     *     'change:source', import("../Object").ObjectEvent> &
+     *   import("../Observable").OnSignature<import("../render/EventType").LayerRenderEventTypes, import("../render/Event").default>}
+     */
+    this.on;
+
     /**
      * @private
      * @type {?import("../events.js").EventsKey}

src/ol/layer/VectorTile.js

@@ -95,6 +95,14 @@ class VectorTileLayer extends BaseVectorLayer {
       )
     );
 
+    /***
+     * @type {import("../Observable").OnSignature<import("../Observable").EventTypes, import("../events/Event.js").default> &
+     *   import("../Observable").OnSignature<import("./Base").BaseLayerObjectEventTypes|
+     *     'change:source'|'change:preload'|'change:useInterimTilesOnError', import("../Object").ObjectEvent> &
+     *   import("../Observable").OnSignature<import("../render/EventType").LayerRenderEventTypes, import("../render/Event").default>}
+     */
+    this.on;
+
     if (options.renderMode === VectorTileRenderType.IMAGE) {
       //FIXME deprecated - remove this check in v7.
       //eslint-disable-next-line