Object literal shorthands and Boolean values

model.js

import mongoose, { Schema } from 'mongoose';

// Define helper for `required` property and never
// write `required: true` again.
// Why? It’s DRY and improves readability.
const required = true;

export default (function _createTaskModel() {
  let model;

  if (mongoose.modelNames().indexOf('Task') < 0) {
    const schema = new Schema({
      type: { type: String, required, enum: ['base', 'promo'] },
      title: { type: String, required }
      priority: Number,
      score: { type: Number, required },
      published: { type: Boolean, required },
    });
    model = mongoose.model('Task', schema);
  } else {
    model = mongoose.model('Task');
  }

  return model;
})();