They use tree-sitter https://tree-sitter.github.io/tree-sitter/ https://tree-sitter.github.io/tree-sitter/ It's ok with errors in AST and just marks such nodes

They use tree-sitter https://tree-sitter.github.io/tree-sitter/ https://tree-sitter.github.io/tree-sitter/ It's ok with errors in AST and just marks such nodes as invalid. There is a long (42 minutes) but worth to watch talk about tree-sitter https://www.youtube.com/watch?v=a1rC79DHpmY https://www.youtube.com/watch?v=a1rC79DHpmY Or the shorter version (20 minutes) https://www.youtube.com/watch?v=0CGzC_iss-8 https://www.youtube.com/watch?v=0CGzC_iss-8