node-errno

foo.js

const create = require('.').create                      
const CustomError = require('.').custom.CustomError     
const inherits = require('inherits')                    
                                                        
// inherits from CustomError (which inherits from Error)
const MyError = create('MyError')                       
const MyError3 = create('MyError3', MyError)            
                                                        
// same but using traditional inheritance               
function MyError2 (message, cause) {                    
  CustomError.call(this, message, cause)                
}                                                       
                                                        
inherits(MyError2, CustomError)                         
                                                        
function bar () {                                       
  console.log(new MyError().stack)                      
  console.log(new MyError2('MyError2', 'woot').stack)   
  console.log(new MyError3('MyError3', 'woot').stack)   
}                                                       
                                                        
function foo () {                                       
  bar()                                                 
}                                                       
                                                        
foo()