I’m getting the same issue and couldn’t resolve it. I’ve stayed on 1.5.1 (I was able to revert to an earlier commit in git and it worked again for me), and any upgrade to 1.5.2 or now 1.6 and I get the exact same error…
EDIT:
After painstaking adding/removing packages, I managed to narrow it down to the alanning:elasticsearch package.
Once I removed this, everything worked again. The three packages that it removed were:
alanning:elasticsearch
alanning:update-helpers
meteorhacks:async
My hunch is meteorhacks:async is likely the real problem, because it’s an old package (pre-ES6) that messes with sync and async javascript calls, so it’s probably conflicting with new ES6 promises and other features.
Anyway, for now, I’ve removed that package and everything works. Now I just have to find an npm package to replace that functionality
Hope this helps!