next.js

cb0d88f6 - Improve existing dev server error message to suggest using it (#92317)

Improve existing dev server error message to suggest using it (#92317) <!-- CURSOR_AGENT_PR_BODY_BEGIN --> ### What? Improves the error message shown when a user tries to start `next dev` while another dev server is already running in the same directory. ### Why? Previously, the error message only suggested killing the existing process (`Run kill <pid> to stop it.`). This wasn't the best advice — often the user just wants to access the already-running dev server rather than kill it and start a new one. ### How? Updated the error message in `packages/next/src/build/lockfile.ts` to present both options: 1. Access the existing server at its URL 2. Kill the process if they want to start a new one **Before:** ``` ✖ Another next dev server is already running. - Local: http://localhost:3000 - PID: 61479 - Dir: /path/to/project - Log: .next/dev/logs/next-development.log Run kill 61479 to stop it. ``` **After:** ``` ✖ Another next dev server is already running. - Local: http://localhost:3000 - PID: 61479 - Dir: /path/to/project - Log: .next/dev/logs/next-development.log You can access the existing server at http://localhost:3000, or run kill 61479 to stop it and start a new one. ``` Updated the lockfile test regex to match the new message format. <!-- CURSOR_AGENT_PR_BODY_END --> [Slack Thread](https://vercel.slack.com/archives/C046HAU4H7F/p1775173304387809?thread_ts=1775173304.387809&cid=C046HAU4H7F) <div><a href="https://cursor.com/agents/bc-0bb3085b-1fd1-56c3-8617-cd8a32d8c376"><picture><source media="(prefers-color-scheme: dark)" srcset="https://cursor.com/assets/images/open-in-web-dark.png"><source media="(prefers-color-scheme: light)" srcset="https://cursor.com/assets/images/open-in-web-light.png"><img alt="Open in Web" width="114" height="28" src="https://cursor.com/assets/images/open-in-web-dark.png"></picture></a>&nbsp;<a href="https://cursor.com/background-agent?bcId=bc-0bb3085b-1fd1-56c3-8617-cd8a32d8c376"><picture><source media="(prefers-color-scheme: dark)" srcset="https://cursor.com/assets/images/open-in-cursor-dark.png"><source media="(prefers-color-scheme: light)" srcset="https://cursor.com/assets/images/open-in-cursor-light.png"><img alt="Open in Cursor" width="131" height="28" src="https://cursor.com/assets/images/open-in-cursor-dark.png"></picture></a>&nbsp;</div> --------- Co-authored-by: Cursor Agent <cursoragent@cursor.com>