[kdy1]

Summary

Switch TypeScript type stripping from swc_ts_fast_strip to the SWC Next crates published on crates.io, pinned to 0.4.1. Preserve fixed-width stripping, the transformSync API, and the existing Node.js REPL helpers.

Remove mode: "transform", the amaro/transform loader, transformation-only options, and their dependencies and tests. Requests for the removed mode now fail instead of falling back to stripping. This is a breaking change, consistent with the removal of transformation support in nodejs/node#61803.

The adapters preserve Amaro's diagnostic codes and location fields, while messages and highlighted ranges come from SWC Next. Existing SWC crates remain for REPL helpers and diagnostic formatting.

Validation

Existing local validation of the reviewed changes at 8da62c210:

• cargo test --manifest-path crates/amaro/Cargo.toml --locked: 18 passed.
• wasm-pack build crates/amaro --out-name wasm --release --target nodejs -- --locked: passed.
• npm run build, npm run typecheck, and npm run ci: passed.
• npm test: 99 passed, including removed-mode rejection, loader behavior, source positions, and REPL helpers.

Draft status

Additional bug analysis of the related swc-next components is currently in progress to look for potential upstream bugs. This PR remains a draft while that analysis continues; the passing tests above do not establish complete compatibility or prove that swc-next is free of bugs.

AI assistance and human review

AI was used to prepare these changes. Human-reviewed by @kdy1.

• Harness: T3 Code (Codex harness)
• Model: gpt-6.1-sol
• Reasoning Effort: medium

[marco-ippolito]

Amazingg work, does this boost the performance?

[kdy1]

It's currently mixed, so I'll optimize the swc-next first