This issue is more likely than not an installation error but I've been fooling around a little with Reason and haven't been able to get the LSP to work in oni.
I've followed the install instructions from the reason-react website and it works in development but not in the packaged app I just get an error that says unable to spawn the lsp.

So far I haven't looked much at Oni LSP implementation so not sure if I've missed a configuration option or there might be an error somewhere.
I'm using the default config options (I haven't added any of my own)
Oh wow - looks like we do have the wrong path for the language server in the packed version! Nice catch, @Akin909 .
The .bin folder doesn't make it into the packaged build, but we have this in our default config:
export const ocamllanguageserverpath = platform.iswindows()
? path.join(__dirname, "node_modules", ".bin", "ocaml-language-server.cmd")
: path.join(__dirname, "node_modules", ".bin", "ocaml-language-server")
Might be part of the reason why the test to verify language services in a Reason file is failing (#1189) 馃 Thanks for logging this issue!
closed by #1380