bootstrap.js

import * as Config from 'config';
const expressConfig = Config.get('express') as ExpressConfig;

class Bootstrap {

  constructor(app) {
    let self = this;
    // Taking the list from the the config file
    let bootstrap = expressConfig.bootstrap;  
    for (var module of bootstrap) {
      self.middleware[module](app);
    }
  }
  
  middleware = {
    /**
     * Core components, such as security, compression, responses, body parser.
     */
    core: (app) => {
      // Security
      app.use(Helmet());
      // Compression
      app.use(Compression());
      // Proper error messages
      app.use(Boom());
      // json body parser
      app.use(BodyParser.json());
    },

    /**
     * CORS settings.
     * This is configurable in the config files.
     */
    cors: (app) => {
      var corsOptions = {
        credentials: true,
        origin: expressConfig.allowOrigin,
      };
      app.use(CORS(corsOptions));
      app.options('*', CORS(corsOptions));
    },

    /**
     * Session management. Configure your settings here.
     * e.g. RedisStore
     */
    session: (app) => {
      const Session = require('express-session');
      app.use(Session());
    },
  };
}

export {Bootstrap};