diff --git a/examples/jsm/utils/BufferGeometryUtils.d.ts b/examples/jsm/utils/BufferGeometryUtils.d.ts
new file mode 100644
index 0000000000000000000000000000000000000000..2429f0a1a2d107a0f622f623da2deb381cf6a16c
--- /dev/null
+++ b/examples/jsm/utils/BufferGeometryUtils.d.ts
@@ -0,0 +1,7 @@
+import { BufferAttribute, BufferGeometry } from '../../../src/Three';
+
+export namespace BufferGeometryUtils {
+    export function mergeBufferGeometries(geometries: BufferGeometry[]): BufferGeometry;
+    export function computeTangents(geometry: BufferGeometry): null;
+    export function mergeBufferAttributes(attributes: BufferAttribute[]): BufferAttribute;
+}
diff --git a/examples/jsm/utils/GeometryUtils.d.ts b/examples/jsm/utils/GeometryUtils.d.ts
new file mode 100644
index 0000000000000000000000000000000000000000..e9e1deb278428b36f6efa45e1924841e88b7a20e
--- /dev/null
+++ b/examples/jsm/utils/GeometryUtils.d.ts
@@ -0,0 +1,13 @@
+/**
+ * @deprecated
+ */
+export namespace GeometryUtils {
+    /**
+     * @deprecated Use {@link Geometry#merge geometry.merge( geometry2, matrix, materialIndexOffset )} instead.
+     */
+    export function merge(geometry1: any, geometry2: any, materialIndexOffset?: any): any;
+    /**
+     * @deprecated Use {@link Geometry#center geometry.center()} instead.
+     */
+    export function center(geometry: any): any;
+}
diff --git a/examples/jsm/utils/SceneUtils.d.ts b/examples/jsm/utils/SceneUtils.d.ts
new file mode 100644
index 0000000000000000000000000000000000000000..b80cd2d841c91cae7dcaf0dd70ab859ec857e972
--- /dev/null
+++ b/examples/jsm/utils/SceneUtils.d.ts
@@ -0,0 +1,7 @@
+import { Geometry, Material, Object3D, Scene } from '../../../src/Three';
+
+export namespace SceneUtils {
+    export function createMultiMaterialObject(geometry: Geometry, materials: Material[]): Object3D;
+    export function detach(child: Object3D, parent: Object3D, scene: Scene): void;
+    export function attach(child: Object3D, scene: Scene, parent: Object3D): void;
+}