像这样更新user.ts文件:

Update your user.ts file like this:

import * as mongoose from 'mongoose';
import * as passportLocalMongoose from 'passport-local-mongoose';
import { PassportLocalSchema } from 'mongoose';

const userSchema = new mongoose.Schema({
  email: String,
  password: String,
  displayname: String,
  groups: [{
    type: mongoose.Schema.Types.ObjectId,
    ref: 'Group'
  }]
});

userSchema.plugin(passportLocalMongoose, {
  usernameField: 'email'
});

const User = mongoose.model('User', userSchema as PassportLocalSchema);

export default User;

对我有用.