We use PureScript at Awake Security (now part of Arista Networks). The language is such a joy to use for a complex single-page application. All-in we have ~150,000 lines of PureScript, though we use it for more than just the SPA (we parse protobuf files and code-generate all our APIs, among other things). We're using the bare-bones react bindings with React Hooks.

PureScript is niche, but when it's the right fit for your problem it's a wonderful language to work in and especially to maintain.