Next.js · Senior · Question 60 of 75

Why can `next dev` and `next build` run at the same time in Next.js 16?

✓Correct answer: They use separate output directories - next dev writes to .next/dev
2next build now runs in the cloud
3Turbopack locks files to prevent conflicts

Explanation

Previously both wrote to .next, so a build could break a running dev server. Tools that read .next directly may need path updates.

Further reading

Next.js: Upgrading to Version 16 ↗

Test yourself

Take the Next.js · Senior quiz: questions and options are shuffled, and you get a review of your mistakes at the end.