fixed so the code compiles

node_modules/passport-strategy/lib/strategy.js

@@ -0,0 +1,28 @@
+/**
+ * Creates an instance of `Strategy`.
+ *
+ * @constructor
+ * @api public
+ */
+function Strategy() {
+}
+
+/**
+ * Authenticate request.
+ *
+ * This function must be overridden by subclasses.  In abstract form, it always
+ * throws an exception.
+ *
+ * @param {Object} req The request to authenticate.
+ * @param {Object} [options] Strategy-specific options.
+ * @api public
+ */
+Strategy.prototype.authenticate = function(req, options) {
+  throw new Error('Strategy#authenticate must be overridden by subclass');
+};
+
+
+/**
+ * Expose `Strategy`.
+ */
+module.exports = Strategy;