RGBELoader global file

I was trying to create a sample app using Ar.js +Three.js.
I was loading the Model in the scene after detecting the marker, but the model is coming with rough textures.
I saw that RGBELoader enables the HDF reflection effect on the model textures, but Ar.js uses the only global Files.
Where can I find the RGBELoader global file?

Are you looking for: https://cdn.jsdelivr.net/npm/three@0.124/examples/js/loaders/RGBELoader.js ?