Installing tern-mode from MELPA makes M-. for JS work in Emacs.

It does for languages where you can find a mode that supports it. I never found one for Javascript. Honestly though, while I like the feature, I never notice that it's not there when I'm using Emacs. I can get around in a JS code base.

The only environment that I've been in where it was critical was large Java projects. I would have been lost without being able to goto def though maven dependencies. Having to read XML to figure out where stuff is would have driven me insane.

Vim doesn't either. You have to use third party plugins.

Visual Studio Code itself doesn't either.