Doesn't work with default parameters

[aonghusonia]

With default parameters now available in Node 6 I'd like to start using them but vargs does not work with them because function.length only includes parameters before the first one with a default value. Not sure what the fix might be short of adding an extra parameter to manually specify the function arity.

[alesmenzel]

There is currently no good way to introspect the number of arguments (unless you do like toString() and parse it with a regex...). The fnc.length used in this module does stop at the first encountered default parameter as those are not counted, same as spread. See MDN

[aonghusonia]

Best way I've found is to change the length of the function before passing it to vargs. see #4

function func(a,  b = 2, c = 3, callback){
 callback(a + b + c);
}

Object.defineProperty(func, 'length', { value: 4})

vargs(func)(1, console.log) // 6

[alesmenzel]

Yeah, but that would mean you have to do it for every function that is used with vargs. Ultimately i decided to try the regex way and created 2 repositories:

Argument parser: GitHub
-> NPM

Vargs package that can handle default parameters: GitHub
-> NPM