module_define.js

(function(global, modules, factory){
    global.module = function(){
        return modules[name] || (modules[name]={define:factory()});
    };
})(this, {}, function(){
    return (function(prefixe, normalize, err){
        return (function moduleBind(modules, context, prefix) {
            return (function(get, set, identity){
                return function module(name, requires, invoke) {
                    return arguments.length === 1 ? get(prefixe(prefix,name, true)) : (function(instance, context){
                        set(prefixe(prefix,name, true), invoke.apply(context, requires.map(function(module) {
                            return module === 'define' ? instance.define : get(prefixe(name,module, true));
                        })));
                        return instance
                    })({define:moduleBind(modules, context, name)}, context||this, (invoke === undefined) && (invoke = identity(requires)) && (requires = []));
                }
            })(function get(module){
                return modules[normalize(module)] || err("Missing module <{0}>, ensure you have the declaration initialized before call it", module);
            }, function(module, instance){
                modules[normalize(module)] = instance;
            }, function(identity) {
                return function() {
                    return identity
                }
            });
        })({}, global || this, '');
    })(function(prefix, name, check){
        return (check && (/\./).test(name)) || !prefix ? name : prefix + '$' + name;
    }, function(str){
        return str.replace(/[\.\/\-\_]/g,'$');
    }, function(msg){
        throw new Error((msg||'Unknow error').replace(/(\{([0-9]+)\})/g, (function(parts){
            return function(m){
                return parts[m[1]];
            }
        }(Array.prototype.slice.call(arguments, 1)))));
    })
});

var app = module('app');

var fruits = app.define('fruits', function(){
    /*do nothing*/
});

fruits.define('oranges', 2);
fruits.define('bananas', 4);

// undefined
console.log(app.define('fruits'))

// 2
console.log(fruits.define('oranges'));

// 4
console.log(fruits.define('bananas'));

// Error
try{
    console.log(app.define('bananas'))
} catch(e){
    console.warn(e.message);
}
// Error
try{
    console.log(app.define('foo', ['bananas'], function(bananas){
        // Causes error because doesn't exist module bananas in foo
        // So if you want include fruit.bananas you must put full path
    }));
} catch(e){
    console.warn(e.message);
}

// true
console.log(fruits.define('oranges') === fruits.define('fruits.oranges') && fruits.define('oranges') === define('fruits.oranges'));

app.define('fruits.bananas', 70)

// 70
console.log(fruits.define('bananas'));

app.define('fruits', ['define'], function(define){
    define('oranges', 20);
    define('lemons', 100);
});

// 20
console.log(fruits.define('oranges'));

app.define('fruits', ['define', 'oranges', 'fruits.lemons'], function(define, oranges, lemons){
    define('fruits.bananas', 50);
    return {
        oranges: oranges,
        lemons: lemons,
        bananas: define('bananas'),
        apples: 5
    }
});

// {oranges: 20, lemons: 100,bananas: 50, apples: 5}
console.log(app.define('fruits'));