[georgecarlin]

You used emacs for 10 years and never used cscope?

[coldtea]

Since he wants that feature to work for Javascript, cscope is irrelevant anyway.

[MetaDark]

Well if he wanted code navigation for JavaScript he could have used tern. It also integrates nicely with company for auto-completion.

[josteink]

Or tide, which uses the typescript tsserver-backend for all its code-analysis.

Gives you navigation, refactoring, completion, eldoc etc. Basicslly JS on steroids.

[groovy2shoes]

cscope may be irrelevant, but ctags/etags has support for JS (and other languages that would be relevant for web developers, like HTML, PHP, Python, Ruby, SQL, ...).