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docs/start-server.js /
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| import dotenv from 'dotenv' | |
| import './lib/check-node-version.js' | |
| import './lib/handle-exceptions.js' | |
| import portUsed from 'port-used' | |
| import createApp from './lib/app.js' | |
| import warmServer from './lib/warm-server.js' | |
| import http from 'http' | |
| dotenv.config() | |
| const { PORT, NODE_ENV } = process.env | |
| const port = Number(PORT) || 4000 | |
| export async function main() { | |
| if (NODE_ENV !== 'production') { | |
| await checkPortAvailability() | |
| } | |
| return await startServer() | |
| } | |
| async function checkPortAvailability() { | |
| // Check that the development server is not already running | |
| const portInUse = await portUsed.check(port) | |
| if (portInUse) { | |
| console.log(`\n\n\nPort ${port} is not available. You may already have a server running.`) | |
| console.log( | |
| `Try running \`npx kill-port ${port}\` to shut down all your running node processes.\n\n\n` | |
| ) | |
| console.log('\x07') // system 'beep' sound | |
| process.exit(1) | |
| } | |
| } | |
| async function startServer() { | |
| const app = createApp() | |
| // Warm up as soon as possible. | |
| // The `warmServer()` function is idempotent and it will soon be used | |
| // by some middleware, but there's no point in having a started server | |
| // without this warmed up. Besides, by starting this slow thing now, | |
| // it can start immediately instead of waiting for the first request | |
| // to trigger it to warm up. That way, when in development and triggering | |
| // a `nodemon` restart, there's a good chance the warm up has come some | |
| // way before you manage to reach for your browser to do a page refresh. | |
| await warmServer() | |
| // Workaround for https://github.com/expressjs/express/issues/1101 | |
| const server = http.createServer(app) | |
| return server | |
| .listen(port, () => console.log(`app running on http://localhost:${port}`)) | |
| .on('error', () => server.close()) | |
| } |