current.js

var Plugin = function (model, options) {
    // do something with options
    model.extend({ factoryMethod: function () { /* do stuff */ }});
    model.prototype.extend({ instanceMethod: function () { /* do other stuff */ }});
    model.extendSchema(Joi.object({ some: 'field' }));
};

future.js

var Plugin = function (model, options) {
    // do your startup crap here
    model.factoryMethod = function () { /* do stuff */ };
    model.prototype.instanceMethod = function () { /* do other stuff */ };
    model.schema = Joi.object({ some: 'field' });
};