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Reorders the option struct fields in `oxc_transformer` and the napi transform binding to match the order their transforms are evaluated, and documents that order on each struct. Behavior-neutral; the only externally visible change is field order and docs in the generated `index.d.ts`. - **`TransformOptions`** (`oxc_transformer`): `react_compiler` (separate pass before the traversal) → `typescript` → `decorator` → `plugins` → `jsx` → `env`, with `helper_loader` last (not a transform). Previously `plugins` sat after `env` and `react_compiler` was last despite running first. - **`EnvOptions`**: was ascending `es2015`→`es2026`; now `module` (consumed by the TypeScript transform), then `es2026` down to `es2015`, then `regexp` last. - **`ES2020Options`**: `optional_chaining` moved next to `nullish_coalescing_operator`, matching their `enter_expression` order. - **napi `TransformOptions`**: follows the full compiler pipeline — `lang`/`sourceType` (parse) → `assumptions` → `reactCompiler` → `typescript` → `decorator` → `plugins` → `jsx` → `target` → `helpers` → `inject` → `define` → `sourcemap` (codegen). Two things this surfaced: `inject` runs **before** `define` (the struct listed them reversed), and `sourcemap` is a codegen option so it belongs at the end. `index.d.ts` regenerated. The canonical order is `TransformerImpl`'s field order in `lib.rs` (and `CompilerInterface::compile` for the napi pipeline stages); a note on `TransformerImpl` now reminds maintainers to keep `TransformOptions` in sync. Verified: `cargo check`/`clippy --all-features --all-targets` (CI profile), `cargo test -p oxc_transformer`, napi vitest 62/62, transform conformance with zero snapshot diffs. 🤖 Generated with [Claude Code](https://claude.com/claude-code)