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Void method in if clause #10942
Description
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.
Activity
RyanCavanaugh commentedon Sep 15, 2016
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 commentedon Sep 15, 2016
Thank you Ryan Cavanaugh (@RyanCavanaugh) for your answer, well... that is an abstraction of the
existsmethod fromfsmodule of Node.js typing. I just noticed it when I was coding...jeffreymorlan commentedon Sep 16, 2016
#7256
RyanCavanaugh commentedon Sep 16, 2016
Thanks jeffreymorlan !