node.js cycles modules

README.md

Reference:

• Cycles Modules
• node.js and circular dependencies
• Circular dependencies in node.js

lib1.js

var lib2   = require('./lib2');
var lib3   = require('./lib3');
var assert = require('assert');

var lib1 = function() {
    this.lib2Type =  typeof(lib2);
    this.lib3Type =  typeof(lib3);
};

module.exports = lib1;

lib2.js

var lib3 = require('./lib3.js');
var assert = require('assert');

var lib2 = function () {
    var lib1 = require('./lib1.js');
    this.lib1Type =  typeof(lib1);
    this.lib3Type =  typeof(lib3);
};

module.exports = lib2;

lib3.js

var assert = require('assert');

var lib3 = function() {
    var lib1 = require('./lib1.js');
    this.lib1Type = typeof(lib1);

    var lib2 = require('./lib2.js');
    this.lib2Type = typeof(lib2);
};

module.exports = lib3;

test.js

var Lib1   = require('./lib1.js');
var Lib2   = require('./lib2.js');
var Lib3   = require('./lib3.js');
var assert = require('assert');

describe('Type of', function() {
    'use strict';

    it('all should be function', function() {
        assert.equal(typeof(Lib1), 'function');
        assert.equal(typeof(Lib2), 'function');
        assert.equal(typeof(Lib3), 'function');
    });

    it('all should still be function in lib1', function() {
        var lib1 = new Lib1();
        assert.equal(lib1.lib2Type, 'function');
        assert.equal(lib1.lib3Type, 'function');
    });

    it('all should still be function in lib2', function() {
        var lib2 = new Lib2();
        assert.equal(lib2.lib1Type, 'function'); // fail
        assert.equal(lib2.lib3Type, 'function'); 
    });


    it('all should still be function in lib3', function() {
        var lib3 = new Lib3();
        assert.equal(lib3.lib1Type, 'function'); // fail
        assert.equal(lib3.lib2Type, 'function');
    });
});