The overwolf.benchmarking has been deprecated for a while now.
It's marked as such:
/**
* @deprecated Since version 0.155.
*/
declare namespace overwolf.benchmarking {
This marking seems to be problematic as of the latest version of Typescript.
Playground example:

A solution would be to remove the deprecation marking from the entire namespace, and apply it to the individual members, there's 8 such members, it shouldn't take long.
Thanks in advance <3