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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
41 lines
1.2 KiB
JavaScript
41 lines
1.2 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 path = require('node:path');
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var app = module.exports = express();
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// path to where the files are stored on disk
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var FILES_DIR = path.join(__dirname, 'files')
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app.get('/', function(req, res){
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res.send('<ul>' +
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'<li>Download <a href="/files/notes/groceries.txt">notes/groceries.txt</a>.</li>' +
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'<li>Download <a href="/files/amazing.txt">amazing.txt</a>.</li>' +
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'<li>Download <a href="/files/missing.txt">missing.txt</a>.</li>' +
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'<li>Download <a href="/files/CCTV大赛上海分赛区.txt">CCTV大赛上海分赛区.txt</a>.</li>' +
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'</ul>')
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});
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// /files/* is accessed via req.params[0]
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// but here we name it :file
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app.get('/files/*file', function (req, res, next) {
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res.download(req.params.file.join('/'), { root: FILES_DIR }, function (err) {
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if (!err) return; // file sent
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if (err.status !== 404) return next(err); // non-404 error
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// file for download not found
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res.statusCode = 404;
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res.send('Cant find that file, sorry!');
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});
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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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