如何使用AMD和commonjs声明可选的jQuery依赖项

Question

如何在纯javascript插件中声明jQuery的可选依赖项？

我当前的插件以：

开头

(function (root, factory) {
    if (typeof define === 'function' && define.amd) {
        // if i put 'jQuery' in the array here that's a forced dependency
        // and I want it optional
        define([], factory);
    }
    else if (typeof exports === 'object') {
        module.exports = factory();
    }
    else {
        root.myPlugin = factory(root.$ || root.jQuery);
    }
}(this, function (jQuery) {

    "use-strict";
     ... plug-in code

}));