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runApp.js
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runApp.js
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import find from 'find-process';
import chalk from 'chalk';
// Hot reloading after recovering from a broken build (most commonly triggered by saving a file that has invalid jsx in it) does not
// kill the previous node app that crashed. Most of the code in here exists to gracefully kill the crashed app so that the
// terminal isn't constantly spammed with meaningless errors.
const runApp = (app, port) => {
let portConflictResolutionAttempted = false;
const start = () => {
app.listen(port, () => console.log(chalk.green(`[server] Listening on port ${port}`)))
.on('error', e => {
if (!portConflictResolutionAttempted) {
console.log(chalk.yellow(`[server] Encountered a port conflict. Attempting to clear port ${port}.`))
killConflictingApps();
} else {
console.log(chalk.red(`[server] Unable to listen on port ${port}:`));
console.log(chalk.red(e));
}
});
}
const killConflictingApps = async () => {
portConflictResolutionAttempted = true;
if (process.env.NODE_ENV !== "production") {
const list = await find('port', port);
if (!list.length) {
console.log(chalk.green(`[server] Port ${port} is free :)`));
} else {
list.forEach(({pid, name}) => {
if (pid !== process.pid) {
console.log(chalk.cyan(`[server] Killing process ${name} due to conflict on port ${port}.`));
process.kill(pid);
}
})
}
// process.kill does not happen immediately so we need to wait just a bit before
// actually trying to run again.
setTimeout(start, 100);
} else {
console.log(chalk.red('[server] Not killing conflicting apps because in production mode.'));
}
}
start();
}
export default runApp;