inheritz

Node.JS 'inherits' replacement that supports mixins.

Call it like the normal Node.JS 'inherits' and optionally supply additional arguments to add as mixins. All prototype methods of mixin constructors are added to the prototype of the class.

If inheritz is called on a constructor that already inherits from something (ie, it already has prototype methods), then all parameters are added as mixins. This makes it useful for adding mixins to ES6 classes.

var inherits = require('inheritz');

function SuperClassA() {}
SuperClassA.prototype.methodA = function() {
	return 'A';
};

function SuperClassB() {}
SuperClassB.prototype.methodB = function() {
	return 'B';
};

function SuperClassC() {}
SuperClassC.prototype.methodC = function() {
	return 'C';
};

function MyClass() {
	SuperClassA.call(this);
	SuperClassB.call(this);
	SuperClassC.call(this);
}

inherits(MyClass, SuperClassA, SuperClassB, SuperClassC);

var myClass = new MyClass();

myClass.methodA();
myClass.methodB();
myClass.methodC();

By default, if a method on a mixin conflicts with an existing method already belonging to the prototype, the mixin will yield to the existing method.

var inherits = require('inheritz');

function SuperClassA() {}
SuperClassA.prototype.method = function() {
	return 'A';
};

function SuperClassB() {}
SuperClassB.prototype.method = function() {
	return 'B';
};

function MyClass() {
	SuperClassA.call(this);
	SuperClassB.call(this);
}

inherits(MyClass, SuperClassA);
inherits(MyClass, SuperClassB);

var myClass = new MyClass();

console.log(myClass.method()); // prints 'A'

However, if you supply a boolean true as the first parameter to inheritz, this behavior is reversed:

var inherits = require('inheritz');

function SuperClassA() {}
SuperClassA.prototype.method = function() {
	return 'A';
};

function SuperClassB() {}
SuperClassB.prototype.method = function() {
	return 'B';
};

function MyClass() {
	SuperClassA.call(this);
	SuperClassB.call(this);
}

inherits(MyClass, SuperClassA);
inherits(true, MyClass, SuperClassB);

var myClass = new MyClass();

console.log(myClass.method()); // prints 'B'