What is the best method for incorporating the three.js GLTFExporter into a TypeScript project?

I have been exploring the use of GLTFExporter in a three.js project written in TypeScript. I started with a basic template from https://github.com/pinqy520/three-typescript-starter and made modifications to the render function as follows:

console.log(`type of exporter = ${typeof(THREE.GLTFExporter)}`)
let exporter = new THREE.GLTFExporter()
exporter.parse(scene, (gltf) => {console.log("Parsed scene!"); }, {});

However, upon running npm start to view it in the browser, I encountered an issue where THREE.GLTFExporter was undefined, resulting in a "not a constructor" error. It seems like the TypeScript type definition for GLTFExporter is present in three-gltfexporter.d.ts, but the actual class itself is not exported from its source file located at

node_modules/three/examples/js/exports/GLTFExporter.js
(lacking the export keyword). As I am relatively new to TypeScript, I may be missing something important here. Importing other components of three.js works smoothly, leading me to suspect that the issue lies with GLTFExporter being solely defined within the examples/ directory.

Answer №1

To ensure proper functionality, it is essential to declare THREE in the global scope and then import the GLTFExporter module. This setup allows the GLTFExporter file to locate THREE in the global scope for seamless integration:

(<any>window).THREE = THREE;
import "three/examples/js/exporters/GLTFExporter";

An ideal solution would involve having a dedicated declaration file like @types/three with separate module enhancements for each optional extension such as GLTFExporter. This approach would enable TypeScript to identify issues during compile time, providing valuable warnings. Consider submitting a bug report on DefinitelyTyped for further assistance.

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