Atomics.notify doesn't allow omitting last parameter

[RReverser]

TypeScript Version: 3.8.3

Search Terms:

• Atomics.notify
• Atomics

Code

let sab = new SharedArrayBuffer(4);
let int = new Int32Array(sab);
Atomics.notify(int, 0);

Expected behavior:
Compiles successfully.

Actual behavior:
Getting an error:

../temp.ts:3:9 - error TS2554: Expected 3 arguments, but got 2.

3 Atomics.notify(int, 0);
          ~~~~~~~~~~~~~~

  ../../../AppData/Roaming/npm/node_modules/typescript/lib/lib.es2017.sharedmemory.d.ts:126:51
    126     notify(typedArray: Int32Array, index: number, count: number): number;
                                                          ~~~~~~~~~~~~~
    An argument for 'count' was not provided.


Found 1 error.

Playground Link: Actually, this is probably a separate issue, but playground seems to lack definitions for shared memory primitives, even though CLI does. E.g. check a link for the code above: Playground Link