Ionic CLI stopped working - TypeError: Right-hand side of 'instanceof' is not an object⏎

#1

Anyone else running into this?
It was working fine the other day. I haven’t changed/updated/touched node or ionic, or the project and now I went to run ionic serve and get the error:

TypeError: Right-hand side of ‘instanceof’ is not an object⏎

Anything I try to run gives the same error:
ionic
ionic -v

Any ideas?

Thanks.