Nowで始める、ナウでヤングなLINEBot生活（Node.js編）

'use strict'; const line = require('@line/bot-sdk'); const express = require('express'); // create LINE SDK config from env variables const config = { channelAccessToken: process.env.CHANNEL_ACCESS_TOKEN, channelSecret: process.env.CHANNEL_SECRET, }; // create LINE SDK client const client = new line.Client(config); // create Express app // about Express itself: https://expressjs.com/ const app = e