I'm curious to see if Tree-sitter can be used to provide fast and rich code navigation. I was able to implement simple goto definition/references [1], not sure if it can be used for more advanced navigation features in a language-agnostic way.

If you're interested, GitHub is already using it [2] for that purpose and Sourcegraph is experimenting it [3]

[1] https://github.com/alidn/lsif-os [2] https://github.com/github/semantic [3] https://github.com/sourcegraph/sourcegraph/issues/17378