cannorin

Very nice to have these, even only the placeholder types (as in #5539).

I'll do the placeholder (as a first step) this week if no one else is going to do the full binding soon.

[ts2ocaml](https://github.com/ocsigen/ts2ocaml/pull/32) would greatly benefit from having `bigint` defined & supported in rescript. I'm willing to help this if you need a hand.

#5539 solved the core problem, as ts2ocaml now don't have to define bigint on our own and just use `BigInt.t`. It would certainly help if we can have a proper...

I'm creating a tool to generate ReScript bindings from `.d.ts` files, and this would be nice to have for consuming TS [discriminated unions](https://www.typescriptlang.org/docs/handbook/2/narrowing.html#discriminated-unions).

@MangelMaxime I tested it right now and I'm pretty sure `fsharp-language-server` does not have the problem. Hope this helps :pray:

hmm, I just reproduced it with Ionide 4.0.4, .NET Core 3.0.100, VSCode 1.36, Debian buster/sid. I also confirmed that `fsharp-language-server` does not have the problem (the same behavior as before)....

@drk-mtr I can reproduce that. Reinstalling and swapping the extension temporarily solves the problem, and the fresh install don't have the problem, but it's back after restarting VSCode in both...

@clindholm I guess we sinply don't know why this happens?

Note that I'm willing to author a PR for this if we are going to add this 🙂