bad-pattern.js

var assert = require("assert");
var value = runner(callback);

assert.equal(value, "correct value");

function runner(cb) {
    if (true /* or some imaginary condition */) {
        return cb("wrong value");
    }
    return cb(null, "correct value");
}

function callback(error, value) {
    if (error) {
        return error;
    }
    return value;
}