NeedleMimetype:
    | "unknown"
    | "unsupported"
    | "model/gltf+json"
    | "model/gltf-binary"
    | "model/vrm"
    | "model/vnd.usdz+zip"
    | "model/vnd.usd"
    | "model/vnd.usda"
    | "model/vnd.usdc"
    | "model/fbx"
    | "model/vnd.autodesk.fbx"
    | "model/obj"
    | string & {}

The supported file types that can be determined by the engine. Used in tryDetermineMimetypeFromURL and tryDetermineMimetypeFromBinary