The implementation of the parser is deeply, deeply baked in to the whole of the MS TypeScript compiler and tooling libraries. It's not feasible to, e.g., add ne

The implementation of the parser is deeply, deeply baked in to the whole of the MS TypeScript compiler and tooling libraries. It's not feasible to, e.g., add new AST nodes, or change or augment the grammar producing them, and there's nothing like S- or D-expressions to allow for read/parse separation like in lisps. (Which is why I added something D-expression like.)