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server.js

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require('./lib/check-node-version')

require('./lib/handle-exceptions')

require('./lib/feature-flags')

const express = require('express')

const portUsed = require('port-used')

const warmServer = require('./lib/warm-server')

const port = Number(process.env.PORT) || 4000

const app = express()

require('./middleware')(app)

// prevent the app from starting up during tests

/* istanbul ignore next */

if (!module.parent) {

// check that the development server is not already running

portUsed.check(port).then(async status => {

if (status === false) {

// If in a deployed environment, warm the server at the start

if (process.env.NODE_ENV === 'production') {

// If in a true production environment, wait for the cache to be fully warmed.

if (process.env.HEROKU_PRODUCTION_APP || process.env.GITHUB_ACTIONS) {

await warmServer()

}

}

// workaround for https://github.com/expressjs/express/issues/1101

const server = require('http').createServer(app)

server.listen(port, () => console.log(`app running on http://localhost:${port}`))

.on('error', () => server.close())

} else {

console.log(`\n\n\nPort ${port} is not available. You may already have a server running.`)

console.log('Try running `killall node` to shut down all your running node processes.\n\n\n')

console.log('\x07') // system 'beep' sound

process.exit(1)

}

})

}

module.exports = app