Как использовать события в Mongoose?

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const schema = new mongoose.Schema({ name: String });
schema.post('save', function(error, doc, next) {
  if (error.name === 'MongoError' && error.code === 11000) {
    next(new Error('There was a duplicate key error'));
  } else {
    next(error);
  }
});

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const schema = new mongoose.Schema({
  name: String,
  author: { type: mongoose.Schema.Types.ObjectId, ref: 'Author' }
});

schema.post('remove', function(doc, next) {
  this.model('Author').update({ _id: doc.author }, { $pull: { books: doc._id }}, next);
});

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const schema = new mongoose.Schema({
  name: String,
  age: Number
});

schema.pre('save', function(next) {
  if (this.age < 18) {
    next(new Error('You must be at least 18 years old to create an account'));
  } else {
    next();
  }
});