import * as THREE from "three";
import { GLTFLoader } from "three/examples/jsm/loaders/GLTFLoader.js";

//...
const gltfLoader = new GLTFLoader();
gltfLoader.load(
  "/models/Duck/glTF/Duck.gltf",
  (gltf) => {
    console.log("success");
    console.log(gltf);
    scene.add(gltf.scene.children[0]);
  },
  (progress) => {
    console.log("progress");
    console.log(progress);
  },
  (error) => {
    console.log("error");
    console.log(error);
  }
);

// ....