All Transloadians only helped out last month, before that it was just the Uppy core team (and contributors). So it's not that many people, and it's not a wrapper either. Well one could argue, it's a wrapper around https://tus.io but we also had to write that, so short answer: no : )
A glorified javascript wrapper around what? Looking over the feature list...none of them are things that are natively supported in ECMAScript or widely-supported browser standards.