// {app_root}/config/plugin.js
exports.enums = {
  enable: true,
  package: 'egg-enums',
};

// {app_root}/app/enums/letters.js
// use array to init enum
module.exports = app => app.Enum([
  'A',
  'B',
  'C'
]);

// or

// {app_root}/app/enums/colors.js
// use object to set the values
module.exports = app => app.Enum({
  RED: 1,
  GREEN: 4,
  BLUE: 5,
});

// then you can use like this
console.log(app.enums.Letters.B === 1);       // true
console.log(app.enums.Colors.GREEN === 4);    // true