[roryrjb]

Treesitter[0] maybe? Although that may also be built into VS Code too, I've just never seen it mentioned anywhere.

0. https://github.com/tree-sitter/tree-sitter

[jitl]

Treesitter is used heavily behind the scenes at GitHub for things like their secrets scanning and other code analysis.

[IshKebab]

VSCode uses extensions to do language parsing and you can fairly easily use TreeSitter in a VSCode language extension. I have done and it works very well.