how to use a closure

accounts.js

module.exports = {
    localLogin: function (passport) {
        return passport.authenticate("login", {
            successRedirect: "/order/admin",
            failureRedirect : "/order/admin/login",
            failureFlash : true
        })
    }
}

routes.js

var r = require("routing.js")

module.exports = function (app, passport) {
    app.get("/login", r.accounts.localLogin(passport))
}