saphire.js

defmod = function TraceBefore() {
    def = function hello() {
        console.log('before');

        $super();
    };
};

defmod = function TraceAfter() {
    def = function hello() {
        $super();

        console.log('after');
    };
};

defclass = function Foo() {
    def = function hello() {
        console.log('hello from Foo');
    };

    defget = function test() {
        return 5;
    };
};

// class Bar < Foo
//   include TraceBefore
//   prepend TraceAfter
defclass = [Foo, function Bar() {
    this.include(TraceBefore);
    this.prepend(TraceAfter);

    def = function hello() {
        console.log('hello from Bar');
        
        $super();
    };

    defget = function test() {
        return $super() + 5;
    };
}];