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The main goal is to remove the eval-based interpreter. In order to have some good performances, the new parser performs some optimizations on the AST (similar to the ones in the previous implementation), and the Wasm compiler generates code for the optimized AST. For now, in case of errors or unsupported features, the Wasm compiler returns null and the old interpreter is used as a fallback. Few things are still missing: - a wasm-based interpreter using a stack (in case the ps code isn't stack-free); - a better js implementation in case of disabled wasm. but they will be added in follow-up patches.