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Since v5 relies on node >= 18, this is now possible (since v16, v14.18.0 [^1][^2]). It's functionally irrelevant: 1. It's not required for CJS nor ESM (with a few exceptions [^3]) 2. It has no performance promises However, there are upsides to this approach: 1. It brings clear boundaries to what's a built-in and what's an external dependency 2. It reduces the risk of importing unwanted deps where a built-in is expected 3. It's slightly more interoperable with other JS runtimes that provide node compatibility[^4], albeit only during development. Once imported from npm, built-ins are assumed. [^1]:https://nodejs.org/docs/latest-v22.x/api/modules.html#built-in-modules [^2]:https://github.com/nodejs/node/pull/37246 [^3]:https://nodejs.org/api/modules.html#built-in-modules-with-mandatory-node-prefix [^4]:https://docs.deno.com/runtime/fundamentals/node/#using-node's-built-in-modules
96 lines
2.3 KiB
JavaScript
96 lines
2.3 KiB
JavaScript
'use strict'
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/**
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* Module dependencies.
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*/
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var express = require('../..');
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var logger = require('morgan');
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var path = require('node:path');
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var session = require('express-session');
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var methodOverride = require('method-override');
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var app = module.exports = express();
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// set our default template engine to "ejs"
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// which prevents the need for using file extensions
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app.set('view engine', 'ejs');
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// set views for error and 404 pages
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app.set('views', path.join(__dirname, 'views'));
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// define a custom res.message() method
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// which stores messages in the session
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app.response.message = function(msg){
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// reference `req.session` via the `this.req` reference
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var sess = this.req.session;
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// simply add the msg to an array for later
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sess.messages = sess.messages || [];
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sess.messages.push(msg);
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return this;
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};
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// log
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if (!module.parent) app.use(logger('dev'));
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// serve static files
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app.use(express.static(path.join(__dirname, 'public')));
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// session support
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app.use(session({
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resave: false, // don't save session if unmodified
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saveUninitialized: false, // don't create session until something stored
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secret: 'some secret here'
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}));
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// parse request bodies (req.body)
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app.use(express.urlencoded({ extended: true }))
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// allow overriding methods in query (?_method=put)
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app.use(methodOverride('_method'));
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// expose the "messages" local variable when views are rendered
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app.use(function(req, res, next){
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var msgs = req.session.messages || [];
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// expose "messages" local variable
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res.locals.messages = msgs;
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// expose "hasMessages"
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res.locals.hasMessages = !! msgs.length;
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/* This is equivalent:
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res.locals({
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messages: msgs,
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hasMessages: !! msgs.length
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});
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*/
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next();
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// empty or "flush" the messages so they
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// don't build up
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req.session.messages = [];
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});
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// load controllers
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require('./lib/boot')(app, { verbose: !module.parent });
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app.use(function(err, req, res, next){
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// log it
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if (!module.parent) console.error(err.stack);
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// error page
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res.status(500).render('5xx');
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});
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// assume 404 since no middleware responded
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app.use(function(req, res, next){
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res.status(404).render('404', { url: req.originalUrl });
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});
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/* istanbul ignore next */
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if (!module.parent) {
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app.listen(3000);
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console.log('Express started on port 3000');
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}
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