gistfile1.txt

~/Temp/001$ haxe -js test2.js -main Test2 Test2.hx && node test2.js

/Users/lptr/Temp/001/test2.js:22
	if(value == null) throw new TiborError("" + name + " must not be null");
	                        ^
Error: Tibor: tibor must not be null
    at new CustomError (/Users/lptr/Temp/001/test2.js:9:14)
    at TiborError (/Users/lptr/Temp/001/test2.js:14:14)
    at Function.Test2.checkNotNull (/Users/lptr/Temp/001/test2.js:22:26)
    at Function.Test2.main (/Users/lptr/Temp/001/test2.js:27:8)
    at /Users/lptr/Temp/001/test2.js:29:7
    at Object.<anonymous> (/Users/lptr/Temp/001/test2.js:30:3)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)

Test2.hx

import Type;

#if js
@:native("Error")
extern class Error
{
	var message : String;
	var name : String;
	var stack(default,null) : String;

	function new(?message : String) : Void;
}
#elseif flash
import flash.errors.Error;
#end

class CustomError
#if !js
extends Error
#end
{
	public function new(?message:String)
	{
#if js
		var proto = untyped __js__("new Error()");
		proto.message = message;
		untyped __js__("this.constructor.prototype.__proto__ = proto");
#else
		super(message);
#end
	}
}

class TiborError extends CustomError {
	public function new(message:String)
	{
		super("Tibor: " + message);
	}
}

class Test2 {
	public static function checkNotNull<T>(value:T, name:String = "a parameter"):T
	{
		if (value == null)
		{
			throw new TiborError('$name must not be null');
		}
		return value;
	}

	public static function main()
	{
		checkNotNull("Lajos", "lajos");
		checkNotNull(null, "tibor");
	}
}

test2.js

(function () { "use strict";
function $extend(from, fields) {
	function inherit() {}; inherit.prototype = from; var proto = new inherit();
	for (var name in fields) proto[name] = fields[name];
	if( fields.toString !== Object.prototype.toString ) proto.toString = fields.toString;
	return proto;
}
var CustomError = function(message) {
	var proto = new Error();
	proto.message = message;
	this.constructor.prototype.__proto__ = proto;
};
var TiborError = function(message) {
	CustomError.call(this,"Tibor: " + message);
};
TiborError.__super__ = CustomError;
TiborError.prototype = $extend(CustomError.prototype,{
});
var Test2 = function() { }
Test2.checkNotNull = function(value,name) {
	if(name == null) name = "a parameter";
	if(value == null) throw new TiborError("" + name + " must not be null");
	return value;
}
Test2.main = function() {
	Test2.checkNotNull("Lajos","lajos");
	Test2.checkNotNull(null,"tibor");
}
Test2.main();
})();