Logs are currently only displayed after a successful command (like lerna run test). This means scripts like test:watch or build:watch won't work well.

@gigabo mentioned:

The reason it all comes out at once at the end is to avoid having output from different packages interleaved.
Might be nice to have an option to turn on immediate output, maybe with a prefix of package name so the interleaving isn’t so inscrutable?

Is this something worth exploring? I'd be happy to help.