virtual

Virtual
=======

Userland, runtime-checked virtual classes for ES6.

Pass in NODE_ENV=development to get runtime checks. Pass in NODE_ENV=production to disable them.

$3

``js
// create a new class with 2 virtual methods
const AbstractClass = Virtual('virtualMethodFoo', 'virtualMethodBar');

class NotTotallyAbstractClass extends AbstractClass {
constructor() {
super();
}

virtualMethodFoo() {
console.log('foo!');
}
}

class ActuallyConcreteClass extends NotTotallyAbstractClass {
constructor() {
super();
}

virtualMethodBar() {
console.log('bar!');
}
}
let didThrow = false;
try {
// 2 missing implems
new AbstractClass();
}
catch(err) {
didThrow = true;
}
didThrow.should.be.true;

didThrow = false;
try {
// 1 missing implem
new NotTotallyAbstractClass();
}
catch(err) {
didThrow = true;
}
didThrow.should.be.true;

didThrow = false;
try {
new ActuallyConcreteClass();
}
catch(err) {
didThrow = true;
}
didThrow.should.be.false;
``