Hmm, the way I see it is that this only makes a difference if your "more work" is async, in which case I would consider if the function needed refactoring instead - not possible to say with toy code of course. Something like:

  await makeManifest().then(manifest => Promise.all([moreWork(manifest), compileServer(manifest)]))

If, however, "more work" is synchronous then the promise would not resolve until the next tick which puts you in the same place as before + extra overhead from a pair of extra promises.