TypeError: user.get is not a function

[RiteshHajare]

const mongoose = require('mongoose');
const passportLocalMongoose = require('passport-local-mongoose');

const userSchema = new mongoose.Schema({
//schema here
});

userSchema.plugin(passportLocalMongoose, {usernameQueryFields: ["email"]});
const User = new mongoose.model('User',userSchema);

module.exports = User;

this is user model, error occuring while using 'passport-magic-login' does anyone have solution?
I tried almost everything including downgrading version.