Void method in if clause

[sant123]

TypeScript Version: 1.8.0

Is it a bug?

Code

class fsClass {
    exists(path: string, cb?: (exists: boolean) => void): void {

    }
}

var fs = new fsClass();

if(fs.exists("")){

}

Expected behavior:
Raise an error telling a void type is not permitted.

Actual behavior:
No error.

[RyanCavanaugh]

We currently consider anything to be coercable to truthy/falsy. Might be dangerous in this case.

Really seems like your callback parameter should not be optional there, though.

[sant123]

Thank you @RyanCavanaugh for your answer, well... that is an abstraction of the exists method from fs module of Node.js typing. I just noticed it when I was coding...

[jeffreymorlan]

#7256

[RyanCavanaugh]

Thanks @jeffreymorlan !