--noUnusedParameters does not work good enough

[KnisterPeter]

TypeScript Version: 2.0.0

Code

function fn(p1: any, p2: any): void {
  return p2;
}

Expected behavior:
This should compile even with --noUnusedParameters

Actual behavior:
Fails when p1 is unused.

Since this is method signature and callside may not be possible to fix this, the compiler should only flag unused from the end.

[mhegazy]

Change the name of p1 to start with _. Parameters with underscores are exempt from error reporting.

[KnisterPeter]

Interesting hidden feature. 😆
Did you mean with 'working as intended' that this is not subject to change and this is not a bug?
Then I would say 'noUnusedParameters' is unusable, because developers need to know the hidden '_' prefix feature. This does not lead to clean and readable code (IMHO).

[yortus]

This is a duplicate of #9458

[mhegazy]

Interesting hidden feature

Please see documentation at https://github.com/Microsoft/TypeScript/wiki/What%27s-new-in-TypeScript#flag-unused-declarations-with---nounusedparameters-and---nounusedlocals