app.js

import createError from 'http-errors';
import express from 'express';
import cookieParser from 'cookie-parser';
import logger from 'morgan';
import helmet from 'helmet';
import compression from 'compression';
import { errors } from 'celebrate';
import cors from 'cors';

import pollRouter from './routes/pollRouter.js';

const app = express();

app.use(cors());
app.use(helmet());
app.use(compression());

// view engine setup
import path from 'path';
const __dirname = path.resolve();
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());

app.use('/polls', pollRouter);
app.use(errors());

// 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');
});

export default app;