The other comments explained what LSP is - I'll explain what tree-sitter is. It's a clever parser that is very fast when it comes to reparsing a slightly change

The other comments explained what LSP is - I'll explain what tree-sitter is. It's a clever parser that is very fast when it comes to reparsing a slightly changed file (it's 'incremental'). It's also very good at handling errors and continuing to parse your file. You write a grammar in json and it gets compiled to a shared library via C.