You might need a bit more than ASTs, as you need code to be human-readable as well as machine-readable. Maybe CSTs?
CSTs are the right call for round-tripping, but isn't that essentially what tree-sitter gives you, a concrete syntax tree that preserves whitespace, comments, and formatting.
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CSTs are the right call for round-tripping, but isn't that essentially what tree-sitter gives you, a concrete syntax tree that preserves whitespace, comments, and formatting.