You don't get the AST _diff_ as the result (you get a new tree whose structure is shared with the old tree), but tree-sitter is specifically designed to support

You don't get the AST _diff_ as the result (you get a new tree whose structure is shared with the old tree), but tree-sitter is specifically designed to support this kind of incremental edit use case: https://tree-sitter.github.io/tree-sitter/using-parsers#editing https://tree-sitter.github.io/tree-sitter/using-parsers#edit...