distDir
You can specify a name to use for a custom build directory to use instead of .next.
Open next.config.js and add the distDir config:
next.config.js module.exports = {
  distDir: 'build',
}
Now if you run next build Next.js will use build instead of the default .next folder.
distDir should not leave your project directory. For example, ../build is an invalid directory.