How to Print Function Signature in javascript

Question

I have a function:

fs.readFile = function(filename, callback) {
    // implementation code.
};

Sometime later I want to see the signature of th

Answer 1

In node.js specifically, you have to convert the function to string before logging:

$ node
> foo = function(bar, baz) { /* codez */ }
[Function]
> console.log(foo)
[Function]
undefined
> console.log(foo.toString())
function (bar, baz) { /* codez */ }
undefined
> 

or use a shortcut like foo+""