1module.exports = after
 2
 3function after(count, callback, err_cb) {
 4    var bail = false
 5    err_cb = err_cb || noop
 6    proxy.count = count
 7
 8    return (count === 0) ? callback() : proxy
 9
10    function proxy(err, result) {
11        if (proxy.count <= 0) {
12            throw new Error('after called too many times')
13        }
14        --proxy.count
15
16        // after first error, rest are passed to err_cb
17        if (err) {
18            bail = true
19            callback(err)
20            // future error callbacks will go to error handler
21            callback = err_cb
22        } else if (proxy.count === 0 && !bail) {
23            callback(null, result)
24        }
25    }
26}
27
28function noop() {}