AOP.js

(function(global) {
  global.AOP = function(subject) {

    return {

      after(method, advice) {
        const original = subject[method];

        subject[method] = function() {
          const result = original.apply(this, arguments);

          return advice.call(this, result) || result;
        }

        return this;
      },

      before(method, advice) {
        const original = subject[method];

        subject[method] = function() {
          const result = advice.apply(this, arguments);

          return original.apply(this, (result || arguments));
        }

        return this;
      },

      error(method, advice) {
        const original = subject[method];

        subject[method] = function() {

          try {
            return original.apply(this, arguments);
          } catch (e) {
            return advice.call(this, e);
          }
        }
      }
    };
  };
})(this);