1 // Returns a wrapper function that returns a wrapped callback
2 // The wrapper function should do some stuff, and return a
3 // presumably different callback function.
4 // This makes sure that own properties are retained, so that
5 // decorations and such are not lost along the way.
6 module.exports = wrappy
7 function wrappy (fn, cb) {
8 if (fn && cb) return wrappy(fn)(cb)
10 if (typeof fn !== 'function')
11 throw new TypeError('need wrapper function')
13 Object.keys(fn).forEach(function (k) {
20 var args = new Array(arguments.length)
21 for (var i = 0; i < args.length; i++) {
22 args[i] = arguments[i]
24 var ret = fn.apply(this, args)
25 var cb = args[args.length-1]
26 if (typeof ret === 'function' && ret !== cb) {
27 Object.keys(cb).forEach(function (k) {