Turbopack

next dev uses webpack by default. Enable Turbopack with the --turbo flag.

officialNext.js docs (Pages Router and v13 to v14 era)confidence 40%current as of Oct 2024

For most of the Next.js 13 to 15 line the dev server ran on webpack by default. You opted into Turbopack with next dev --turbo once it was stable. Next.js 16 reversed this by making Turbopack the default. The --turbo flag is no longer how you reach it.

Related claims

is superseded by

On Next.js 16 Turbopack is the default bundler for next dev and next build. Opt out with the --webpack flag.

Next.js 16 made Turbopack the default bundler so next dev no longer runs webpack by default. The --turbo flag was the old opt in.