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I use YouCompleteMe at work for large projects (and it still sometimes struggles with looking up some symbols), but for my rather simple personal projects ctags has always been good enough.

Recently I came across https://langserver.org

To me, it looks like an upcoming solution to the 'code completion' problem.

Yep! First class Typescript support makes it great for Javascript development too.

ctags is pretty good for languages it doesn’t support. You can add a new regex-based language definition from the command line.