text: require('dotenv').config() // init dotenv
  
  const createError = require('http-errors')
  const express = require('express')
  const path = require('path')
  const cookieParser = require('cookie-parser')
  const logger = require('morgan')
  
  const indexRouter = require('./routes/index')
  const usersRouter = require('./routes/users')
  
  const app = express()
  
  // view engine setup
  app.set('views', path.join(__dirname, 'views'))
  app.set('view engine', 'pug')
  
  app.use(logger('dev'))
  app.use('/webhook', require('./line')) // 需要在 express.json() 之前
  app.use(express.json())
  app.use(express.urlencoded({ extended: false }))
  app.use(cookieParser())
  app.use(express.static(path.join(__dirname, 'public')))
  
  app.use('/', indexRouter)
  app.use('/users', usersRouter)
  
  // catch 404 and forward to error handler
  app.use(function (req, res, next) {
    next(createError(404))
  })
  
  // error handler
  app.use(function (err, req, res, next) {
    // set locals, only providing error in development
    res.locals.message = err.message
    res.locals.error = req.app.get('env') === 'development' ? err : {}
  
    // render the error page
    res.status(err.status || 500)
    res.render('error')
  })
  
  module.exports = app
  