socket.io の Event をメタプロでクラスに流すサンプルコード

client.js

class ClientEvents {
  static connect() {
    logger.info({ event: 'connect' });
  }

  static reconnect_error(error) {
    logger.info({ event: 'reconnect_error', error: error });
  }
}

socket.on('reconnect_error', ClientEvents.reconnect_error);

// socket.on('connect',         ClientEvents.connect);
const s = 'connect';
socket.on(s, ClientEvents[s]);

forEach で回す

const clientEventNames = [
  'connect',
  'error',
  'disconnect'
];

clientEventNames.forEach(name => socket.on(name, ClientEvents[name]));

camelize 使う
https://github.com/substack/camelize