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A related tool for token based authorship information:
`tree-sitter` has been post to the website a bunch of times so I remembered from those submissions: https://hn.algolia.com/?query=tree-sitter
And tsserver doesn't even comply with the LSP spec, which means non-vscode editors need to choice between buggy support for typescript or also implementing a second protocol that is sort of but not quite LSP.
rust-analyzer [1] goes through the LSP and it's fantastic. It provides an incredibly rich experience nearly on-par with that of TypeScript in VSCode, but for Rust. And it's both third-party and open-source.
My team has a similar project (Locust: https://github.com/bugout-dev/locust) where the goal is to learn the semantic meanings of code changes in git commits, GitHub PRs, etc.
Since we took git diffs as a target for semantic analysis, we have a different approach to our diffs. We start with line-by-line diffs (specifically using "git diff") and then take a semantic diff by superimposing the git diff information on top of the initial and terminal ASTs.
This makes the diff calculation cheaper because we don't have to do full diff between trees.
Haven't updated the code in a few months, but my team is actively using Locust on public GitHub repos to learn the semantics of those code bases. We do plan to do some work on it soon to make it easier to make Locust easier to use (especially as a library).
Really need to sit down and take a proper look at tree-sitter. We currently support Locust diffs for Python, Javascript, and Java, but each one is custom written and implements the same basic algorithm. It looks like tree sitter might just crush this problem for us.
The Theia IDE people have implemented a LSP-wrapper around tsserver [1], which works all right. Of course, the reason that Typescript does not comply to the spec is that it was built before the LSP existed.