This might be an anti-pattern, but I wanted to add Turbo to my NextJS application in a non-monorepo setup and have it run from npm run dev so I don't have to retrain the other contributors (and our CI).

At first Turbo was complaining that I'd created a recursive loop:

   × root task //#dev (turbo dev) looks like it invokes turbo and might cause a loop

To avoid this I added a conditional to my package.json dev script to check if Turbo was executing it (by checking for the existince of the TURBO_HASH environment variable) to run next dev if it was, and moved the turbo dev call to a dev:turbo script since it appears turbo dev is parsing the dev script text for the words turbo dev to throw the above error.

directory structure

./
 | src/[...]
 | package.json 
 | turbo.json

package.json:

{
   ...
   "scripts": {
-     "dev": "next dev",
+     "dev": "if test \"$TURBO_HASH\"; then next dev; else npm run dev:turbo; fi",
+     "dev:turbo": "turbo dev",
      ...
   }
   ...
}

Now running npm run dev runs turbo! 🥳

This pattern can be applied to build, start, lint, etc.

Hope this helps someone else!