dojo_app/js/library/dojo/errors/create.js

define(["../_base/lang"], function(lang){
	return function(name, ctor, base, props){
		base = base || Error;

		var ErrorCtor = function(message){
			if(base === Error){
				if(Error.captureStackTrace){
					Error.captureStackTrace(this, ErrorCtor);
				}

				// Error.call() operates on the returned error
				// object rather than operating on |this|
				var err = Error.call(this, message),
					prop;

				// Copy own properties from err to |this|
				for(prop in err){
					if(err.hasOwnProperty(prop)){
						this[prop] = err[prop];
					}
				}

				// messsage is non-enumerable in ES5
				this.message = message;
				// stack is non-enumerable in at least Firefox
				this.stack = err.stack;
			}else{
				base.apply(this, arguments);
			}
			if(ctor){
				ctor.apply(this, arguments);
			}
		};

		ErrorCtor.prototype = lang.delegate(base.prototype, props);
		ErrorCtor.prototype.name = name;
		ErrorCtor.prototype.constructor = ErrorCtor;

		return ErrorCtor;
	};
});