NPM packages not getting type definitions from @types/*

[ThatBlockyPenguin]

Just ran into this issue myself, but for whatever reason, it isn't working for me... If it's of any help, the output of ctrl+shift+p Deno: Info is:

deno 2.2.2 (release, x86_64-pc-windows-msvc) | vscode_deno 3.43.4 | vscode 1.97.2

@ThatBlockyPenguin Can you open a new issue with a reproduction and more details about the problem?

Originally posted by @nathanwhit in #27569

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I certainly can!
I'm reporting this issue from a different computer (with the same issue).

System info

deno 2.2.3 (release, x86_64-unknown-linux-gnu) | vscode_deno 3.43.5 | vscode 1.98.0

My specific Linux distro is Manjaro Linux.

Steps to Reproduce:

1. Create a new file with the following contents (copied from original issue):

   import { useEffect } from "react";
   
   const foo: string = useEffect; // this assignment should report a type error, but doesn't
   console.log(foo);
   

2. Run deno add npm:react.
3. See that no type checking is present:
   
   

[nathanwhit]

Ah, you need to deno add npm:@types/react as well.

I have a WIP change to have a diagnostic in the editor that can do it for you: #28216

[ThatBlockyPenguin]

Ah, you need to deno add npm:@types/react as well.

smacks forehead of course you do! I genuinely can't believe I forgot to check that!

I have a WIP change to have a diagnostic in the editor that can do it for you: #28216

This very situation tells me that that's going to be very very useful. Sorry for wasting your time, and thanks a bunch!