text: const mongoose = require('mongoose')
  const Schema = mongoose.Schema
  
  const userSchema = new Schema({
    username: {
      type: String,
      required: true,
      unique: true,
      trim: true,
      minlength: 3
    },
  }, {
    timestamps: true,
    })
  
  const User = mongoose.model('User', userSchema)
    
  module.exports = User
  