You should check out https://github.com/tweag/topiary https://github.com/tweag/topiary Yes, theoretically if you had ~identical grammars you could use it to do

You should check out https://github.com/tweag/topiary https://github.com/tweag/topiary Yes, theoretically if you had ~identical grammars you could use it to do a full transpilation. There's a lot of challenges with that though. Writing a correct grammar for 1 language is complicated enough, but writing one for two where all your nodes and fields end up the same is likely insurmountable. In practice, languages are either: - Far enough apart that any pure AST transformation is insufficient and you need an AI component to produce usable output - Close enough that you're better off just targeting the specific parts that differ and rewriting those while leaving the rest alone. I think GritQL can do well here.