diff --git a/package-lock.json b/package-lock.json
index f6f95c632c..61b22e4419 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -10562,9 +10562,9 @@
       }
     },
     "node_modules/typescript": {
-      "version": "4.2.4",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.2.4.tgz",
-      "integrity": "sha512-V+evlYHZnQkaz8TRBuxTA92yZBPotr5H+WhQ7bD3hZUndx5tGOa1fuCgeSjxAzM1RiN5IzvadIXTVefuuwZCRg==",
+      "version": "4.3.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.3.2.tgz",
+      "integrity": "sha512-zZ4hShnmnoVnAHpVHWpTcxdv7dWP60S2FsydQLV8V5PbS3FifjWFFRiHSWpDJahly88PRyV5teTSLoq4eG7mKw==",
       "dev": true,
       "bin": {
         "tsc": "bin/tsc",
@@ -19747,9 +19747,9 @@
       }
     },
     "typescript": {
-      "version": "4.2.4",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.2.4.tgz",
-      "integrity": "sha512-V+evlYHZnQkaz8TRBuxTA92yZBPotr5H+WhQ7bD3hZUndx5tGOa1fuCgeSjxAzM1RiN5IzvadIXTVefuuwZCRg==",
+      "version": "4.3.2",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.3.2.tgz",
+      "integrity": "sha512-zZ4hShnmnoVnAHpVHWpTcxdv7dWP60S2FsydQLV8V5PbS3FifjWFFRiHSWpDJahly88PRyV5teTSLoq4eG7mKw==",
       "dev": true
     },
     "ua-parser-js": {
diff --git a/src/ol/featureloader.js b/src/ol/featureloader.js
index 26ef3be66b..5eed20a2f8 100644
--- a/src/ol/featureloader.js
+++ b/src/ol/featureloader.js
@@ -136,7 +136,7 @@ export function xhr(url, format) {
    * @param {import("./extent.js").Extent} extent Extent.
    * @param {number} resolution Resolution.
    * @param {import("./proj/Projection.js").default} projection Projection.
-   * @param {function(): void} [success] Success
+   * @param {function(Array<import("./Feature.js").default>): void} [success] Success
    *      Function called when loading succeeded.
    * @param {function(): void} [failure] Failure
    *      Function called when loading failed.
diff --git a/src/ol/format/KML.js b/src/ol/format/KML.js
index e2c9e0dd2a..977a6dce3f 100644
--- a/src/ol/format/KML.js
+++ b/src/ol/format/KML.js
@@ -60,7 +60,7 @@ import {transformGeometryWithOptions} from './Feature.js';
  * @property {import("../style/IconAnchorUnits").default} xunits Units of x.
  * @property {number} y Y coordinate.
  * @property {import("../style/IconAnchorUnits").default} yunits Units of Y.
- * @property {import("../style/IconOrigin.js").default} origin Origin.
+ * @property {import("../style/IconOrigin.js").default} [origin] Origin.
  */
 
 /**
diff --git a/src/ol/renderer/Composite.js b/src/ol/renderer/Composite.js
index 40e56e37eb..f2a60c9afa 100644
--- a/src/ol/renderer/Composite.js
+++ b/src/ol/renderer/Composite.js
@@ -128,7 +128,9 @@ class CompositeMapRenderer extends MapRenderer {
         previousElement = element;
       }
       if ('getDeclutter' in layer) {
-        declutterLayers.push(layer);
+        declutterLayers.push(
+          /** @type {import("../layer/BaseVector.js").default} */ (layer)
+        );
       }
     }
     for (let i = declutterLayers.length - 1; i >= 0; --i) {