Introduces `AstFactory<'a>(AstBuilder<'a>)` — a rolldown-owned newtype over oxc's `AstBuilder` that `Deref`s to it, with rolldown-specific constructions added as inherent `make_*` methods. This is the construction baseline; consumers migrate off `AstSnippet` area-by-area in follow-ups, and `AstSnippet` is deleted once empty. See meta/design/ast-construction.md (#9673).

Also migrates the first consumer, vite-web-worker-post: `.builder` reach-throughs become deref'd calls, the `id_ref_expr`/`id_name` thin wrappers are inlined to their oxc equivalents, and `var_decl_stmt` becomes `AstFactory::make_var_decl`. Behavior-preserving.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Introduces `AstFactory<'a>(AstBuilder<'a>)` — a rolldown-owned newtype over oxc's `AstBuilder` that `Deref`s to it, with rolldown-specific constructions added as inherent `make_*` methods. This is the construction baseline; consumers migrate off `AstSnippet` area-by-area, and `AstSnippet` is deleted once empty. See meta/design/ast-construction.md (#9673).

Migrates the first two areas to `AstFactory` (handle named `ast`): vite-web-worker-post and generate_lazy_export. `.builder` reach-throughs become deref'd calls; thin wrappers (`id_ref_expr`, `id_name`) are inlined to their oxc equivalents; genuine patterns become `make_*` (`make_var_decl`, `make_export_default_stmt`, `make_module_exports_stmt`, `make_export_named_stmt` — the last avoids shadowing oxc's builder method); `expr_without_parentheses` is inlined at its single call site. Now-unused `AstSnippet` helpers are left for the wholesale deletion at the end. Behavior-preserving.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Introduces `AstFactory<'a>(AstBuilder<'a>)` — a rolldown-owned newtype over oxc's `AstBuilder` that `Deref`s to it, with rolldown-specific constructions added as inherent `make_*` methods. This is the construction baseline; consumers migrate off `AstSnippet` area-by-area, and `AstSnippet` is deleted once empty. See meta/design/ast-construction.md (#9673).

Migrates the first two areas to `AstFactory` (handle named `ast`): vite-web-worker-post and generate_lazy_export. `.builder` reach-throughs become deref'd calls; thin wrappers (`id_ref_expr`, `id_name`) are inlined to their oxc equivalents; genuine patterns become `make_*` (`make_var_decl`, `make_export_default_stmt`, `make_module_exports_stmt`, `make_export_named_stmt` — the last avoids shadowing oxc's builder method); `expr_without_parentheses` is inlined at its single call site. Now-unused `AstSnippet` helpers are left for the wholesale deletion at the end. Behavior-preserving.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Introduces `AstFactory<'a>(AstBuilder<'a>)` — a rolldown-owned newtype over oxc's `AstBuilder` that `Deref`s to it, with rolldown-specific constructions added as inherent `make_*` methods. This is the construction baseline; consumers migrate off `AstSnippet` area-by-area, and `AstSnippet` is deleted once empty. See meta/design/ast-construction.md (#9673).

Migrates the first two areas to `AstFactory` (handle named `ast`): vite-web-worker-post and generate_lazy_export. `.builder` reach-throughs become deref'd calls; thin wrappers (`id_ref_expr`, `id_name`) are inlined to their oxc equivalents; genuine patterns become `make_*` (`make_var_decl`, `make_export_default_stmt`, `make_module_exports_stmt`, `make_export_named_stmt` — the last avoids shadowing oxc's builder method); `expr_without_parentheses` is inlined at its single call site. Now-unused `AstSnippet` helpers are left for the wholesale deletion at the end. Behavior-preserving.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Introduces `AstFactory<'a>(AstBuilder<'a>)` — a rolldown-owned newtype over oxc's `AstBuilder` that `Deref`s to it, with rolldown-specific constructions added as inherent `make_*` methods. This is the construction baseline; consumers migrate off `AstSnippet` area-by-area, and `AstSnippet` is deleted once empty. See meta/design/ast-construction.md (#9673).

Migrates the first two areas to `AstFactory` (handle named `ast`): vite-web-worker-post and generate_lazy_export. `.builder` reach-throughs become deref'd calls; thin wrappers (`id_ref_expr`, `id_name`) are inlined to their oxc equivalents; genuine patterns become `make_*` (`make_var_decl`, `make_export_default_stmt`, `make_module_exports_stmt`, `make_export_named_stmt` — the last avoids shadowing oxc's builder method); `expr_without_parentheses` is inlined at its single call site. Now-unused `AstSnippet` helpers are left for the wholesale deletion at the end. Behavior-preserving.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

)

Introduces `AstFactory<'a>(AstBuilder<'a>)` — a rolldown-owned newtype over oxc's `AstBuilder` that `Deref`s to it, with rolldown-specific constructions added as inherent `make_*` methods. Each `make_*` takes `&self` and reaches the builder through `Deref`, so call sites don't depend on `AstFactory: Copy` and stay stable when oxc#23043 makes `AstBuilder` non-`Copy`. This is the AST-construction baseline; consumers migrate off `AstSnippet` area-by-area, and `AstSnippet` is deleted once empty. Design doc: `meta/design/ast-construction.md` (#9673), refined here to lock the conventions below.

Migrates the first two areas to `AstFactory` (handle named `ast_factory`):

- **vite-web-worker-post** — `.builder` reach-throughs → deref'd calls; `id_ref_expr`/`id_name` inlined to their oxc equivalents; `var_decl_stmt` → `make_var_decl`.
- **generate_lazy_export** — same pattern; `module_exports_expr_stmt` / `export_default_expr_stmt` / `statement_module_declaration_export_named_declaration` → `make_module_exports_stmt` / `make_export_default_stmt` / `make_export_named_stmt` (the last avoids shadowing oxc's builder method); the reused paren-unwrap loop is extracted into a `take_without_parentheses` helper.

**Locked conventions** (applied here, followed by every later step; recorded in the design doc's Plan section): handle named `ast_factory`; `make_*` take `&self`; reused non-trivial snippets become named helpers.

The now-unused `AstSnippet` helpers are left in place — they're removed wholesale when `AstSnippet` is deleted at the end of the migration. Behavior-preserving.

### AstFactory migration progress (`meta/design/ast-construction.md`)

- [x] Design doc + conventions — #9673 (merged)
- [x] Introduce `AstFactory` + migrate `vite_web_worker_post` + `generate_lazy_export` — **#9682 ← this PR**
- [x] Migrate `tweak_ast_for_scanning` — #9683
- [ ] `vite_build_import_analysis` (~45 sites)
- [ ] hmr finalizer + `hmr_stage` (incl. the `utils.rs` `Deref` blocker)
- [ ] `module_finalizers` (~211 sites)
- [ ] fold construction ext traits; delete `AstSnippet`

Verified: `cargo clippy --deny warnings` + `cargo fmt --check` clean; adversarial sub-agent reviews (behavior-equivalence, Rust soundness, convention/completeness) found no real issues.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Migrates the `PreProcessor` scanner pre-pass off `AstSnippet` to `AstFactory` (handle `ast_factory`): `.builder.*` reach-throughs → deref'd calls, `.alloc()` → `.allocator`. Pure mechanical migration — no new `make_*`. Behavior-preserving; clippy/fmt clean + adversarial reviews.

### AstFactory migration progress (`meta/design/ast-construction.md`)

- [x] Design doc + conventions — #9673 (merged)
- [x] Introduce `AstFactory` + `vite_web_worker_post` + `generate_lazy_export` — #9682 (merged)
- [x] `tweak_ast_for_scanning` — **#9683 ← this PR**
- [x] `vite_build_import_analysis` — #9693
- [x] hmr finalizer + `hmr_stage` (+ 6 shared `make_*`, `builder()` by-value) — #9695
- [x] `module_finalizers/mod.rs` (+ the `make_*` ports it consumes; transitional dual field) — #9700
- [x] rest of `ScopeHoistingFinalizer` (+ wrapper `make_*` ports; `snippet` field removed) — #9701
- [x] fold construction ext traits onto `AstFactory`; delete `AstSnippet` — #9702

🤖 Generated with [Claude Code](https://claude.com/claude-code)

…9693)

Migrates `vite_build_import_analysis` off `AstSnippet` onto `AstFactory`. Adds `AstFactory::make_arrow_returning` **and the identifier shortcuts `make_id` / `make_id_ref_expr` / `make_id_name`** (high-frequency one-liners that read poorly when inlined — per review feedback); migrates `BindingPatternExt::into_expression` to `&AstFactory` (its only external caller is here; `into_assignment_target` deferred). Remaining thin wrappers inlined. Behavior-preserving; 2 adversarial + 1 CodeX review, all clean.

### AstFactory migration progress (`meta/design/ast-construction.md`)

- [x] Design doc + conventions — #9673 (merged)
- [x] Introduce `AstFactory` + `vite_web_worker_post` + `generate_lazy_export` — #9682 (merged)
- [x] `tweak_ast_for_scanning` — #9683
- [x] `vite_build_import_analysis` — **#9693 ← this PR**
- [x] hmr finalizer + `hmr_stage` (+ 6 shared `make_*`, `builder()` by-value) — #9695
- [x] `module_finalizers/mod.rs` (+ the `make_*` ports it consumes; transitional dual field) — #9700
- [x] rest of `ScopeHoistingFinalizer` (+ wrapper `make_*` ports; `snippet` field removed) — #9701
- [x] fold construction ext traits onto `AstFactory`; delete `AstSnippet` — #9702

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Migrates the HMR finalizer area (`crates/rolldown/src/hmr/`) off the legacy `AstSnippet` facade onto the `AstFactory` newtype. Behavior-preserving.

- **Consolidates 3 redundant construction fields** on `HmrAstFinalizer` (`alloc: &Allocator`, `snippet: AstSnippet`, `builder: &AstBuilder`) into a single `ast_factory: AstFactory`. The 3 construction sites in `hmr_stage.rs` build `AstFactory::new(allocator)`.
- **`HmrAstBuilder::builder()`** (shared trait, also impl'd for the not-yet-migrated `ScopeHoistingFinalizer`) now returns `AstBuilder` **by value** (it is `Copy`) instead of `&AstBuilder` — the one non-mechanical fix the design doc flagged. `HmrAstFinalizer` returns `*self.ast_factory`; `ScopeHoistingFinalizer` returns `self.snippet.builder` and keeps compiling unchanged.
- **Shared `make_*` additions on `AstFactory`** (incl. `make_member_access` -> `MemberExpression`, which `make_member_access_expr` delegates to) (faithful ports of `AstSnippet` patterns, reused later by `module_finalizers`): `make_member_access_expr`, `make_call_with_arg`, `make_promise_resolve_then`, `make_lazy_export_property` (renamed from `object_property_kind_object_property` to avoid shadowing the oxc builder method reached via `Deref`), `make_import_star_stmt`, `make_to_esm_call_with_interop`, `make_seq_in_parens`.
- Thin wrappers inlined (`id`/`id_ref_expr`/`id_name`/`atom`/`string_literal_expr`/`call_expr_expr`/…); `var_decl_stmt` → existing `make_var_decl`; `.builder.*` → deref'd `ast_factory.*`; `.alloc()` → `.allocator`.

### AstFactory migration progress (`meta/design/ast-construction.md`)

- [x] Design doc + conventions — #9673 (merged)
- [x] Introduce `AstFactory` + `vite_web_worker_post` + `generate_lazy_export` — #9682 (merged)
- [x] `tweak_ast_for_scanning` — #9683
- [x] `vite_build_import_analysis` — #9693
- [x] hmr finalizer + `hmr_stage` (+ 6 shared `make_*`, `builder()` by-value) — **#9695 ← this PR**
- [x] `module_finalizers/mod.rs` (+ the `make_*` ports it consumes; transitional dual field) — #9700
- [x] rest of `ScopeHoistingFinalizer` (+ wrapper `make_*` ports; `snippet` field removed) — #9701
- [x] fold construction ext traits onto `AstFactory`; delete `AstSnippet` — #9702

🤖 Generated with [Claude Code](https://claude.com/claude-code)

…9700)

Migrates all 179 `self.snippet.*` call sites in `module_finalizers/mod.rs` onto the `AstFactory` handle, **adding the 12 `make_*` methods (+2 private helpers) this file consumes** in the same PR (behavior-identical ports of the corresponding `AstSnippet` patterns): `make_to_esm_wrapper`, `make_keep_name_call`, `make_static_block_keep_name`, `make_re_export_call`, `make_member_expr_or_ident_ref`, `make_member_expr_with_void_zero_object`, `make_callee_then_call`, `make_then_extract_property`, `make_then_call_esm_wrapper_with_namespace`, `make_then_call_cjs_wrapper_with_to_esm`, plus `arrow_function_extract_property` / `then_with_arrow_callback`. Thin wrappers are inlined to deref'd oxc constructor calls, `.builder.*` reach-throughs become deref'd `ast_factory.*`, and `AstBuilder::new(self.alloc)` / `self.builder()` become `*self.ast_factory`. The one-use `object_freeze_dynamic_import_polyfill` is inlined at its call site.

Adds a **transitional** `ast_factory` field alongside `snippet` on `ScopeHoistingFinalizer` — the sibling impl files (`impl_visit_mut.rs` / `rename.rs` / `hmr.rs`) still read `snippet` and migrate in #9701, which removes the field.

Behavior-preserving: two independent full-fixture snapshot differential runs against the parent commit (byte-identical emitted JS, identical pass/fail sets) + 2 adversarial reviews + 1 CodeX review + Copilot, all clean.

### AstFactory migration progress (`meta/design/ast-construction.md`)

- [x] Design doc + conventions — #9673 (merged)
- [x] Introduce `AstFactory` + `vite_web_worker_post` + `generate_lazy_export` — #9682 (merged)
- [x] `tweak_ast_for_scanning` — #9683
- [x] `vite_build_import_analysis` — #9693
- [x] hmr finalizer + `hmr_stage` (+ 6 shared `make_*`, `builder()` by-value) — #9695
- [x] `module_finalizers/mod.rs` (+ the `make_*` ports it consumes; transitional dual field) — **#9700 ← this PR**
- [x] rest of `ScopeHoistingFinalizer` (+ wrapper `make_*` ports; `snippet` field removed) — #9701
- [x] fold construction ext traits onto `AstFactory`; delete `AstSnippet` — #9702

🤖 Generated with [Claude Code](https://claude.com/claude-code)

…ctory (#9701)

Finishes the `ScopeHoistingFinalizer` migration: the remaining `impl_visit_mut.rs` (16 sites) / `rename.rs` (6) / `hmr.rs` (3) call sites move off `AstSnippet`, **adding the `make_commonjs_wrapper_stmt` / `make_esm_wrapper_stmt` ports alongside their first callers**. The transitional `snippet` field from #9700 is removed (struct + construction + imports), and the `HmrAstBuilder::builder()` impl for `ScopeHoistingFinalizer` now returns `*self.ast_factory`. `literal_prop_access_member_expr` (the `MemberExpression`-returning variant) and other thin wrappers are inlined.

Behavior-preserving: full-fixture snapshot suite byte-identical + 2 adversarial reviews + 1 CodeX review + Copilot, all clean.

### AstFactory migration progress (`meta/design/ast-construction.md`)

- [x] Design doc + conventions — #9673 (merged)
- [x] Introduce `AstFactory` + `vite_web_worker_post` + `generate_lazy_export` — #9682 (merged)
- [x] `tweak_ast_for_scanning` — #9683
- [x] `vite_build_import_analysis` — #9693
- [x] hmr finalizer + `hmr_stage` (+ 6 shared `make_*`, `builder()` by-value) — #9695
- [x] `module_finalizers/mod.rs` (+ the `make_*` ports it consumes; transitional dual field) — #9700
- [x] rest of `ScopeHoistingFinalizer` (+ wrapper `make_*` ports; `snippet` field removed) — **#9701 ← this PR**
- [x] fold construction ext traits onto `AstFactory`; delete `AstSnippet` — #9702

🤖 Generated with [Claude Code](https://claude.com/claude-code)

…ory and delete AstSnippet (#9702)

Final step of the migration. `BindingPatternExt::into_assignment_target` / `BindingPropertyExt::into_assignment_target_property` now take `&AstFactory` (matching the `into_expression` precedent from #9693) instead of constructing `AstBuilder::new(alloc)` / `AstSnippet::new(alloc)` internally; the sole external caller (`module_finalizers/mod.rs`) passes `&self.ast_factory`.

With zero users left, `AstSnippet` is deleted — `ast_snippet.rs` (1030 lines) and the `lib.rs` export — and the temporary `## Plan` section in `meta/design/ast-construction.md` is removed per its own instruction (`## Current state` retitled `## Prior state` to match the new reality; one stale method-name doc comment fixed).

Behavior-preserving: full-fixture snapshot suite byte-identical (incl. the `wrapped_esm` fixture, which exercises every branch of the rewritten destructuring-assignment conversion) + 2 adversarial reviews + 1 CodeX review, all clean.

### AstFactory migration progress (`meta/design/ast-construction.md`)

- [x] Design doc + conventions — #9673 (merged)
- [x] Introduce `AstFactory` + `vite_web_worker_post` + `generate_lazy_export` — #9682 (merged)
- [x] `tweak_ast_for_scanning` — #9683
- [x] `vite_build_import_analysis` — #9693
- [x] hmr finalizer + `hmr_stage` (+ 6 shared `make_*`, `builder()` by-value) — #9695
- [x] `module_finalizers/mod.rs` (+ the `make_*` ports it consumes; transitional dual field) — #9700
- [x] rest of `ScopeHoistingFinalizer` (+ wrapper `make_*` ports; `snippet` field removed) — #9701
- [x] fold construction ext traits onto `AstFactory`; delete `AstSnippet` — **#9702 ← this PR**

🤖 Generated with [Claude Code](https://claude.com/claude-code)

## [1.1.1] - 2026-06-11

### 🚀 Features

- ecmascript_utils: introduce AstFactory for AST construction (#9682) by @hyf0
- drop no-op init calls for empty wrapped-ESM modules (#9678) by @IWANABETHATGUY

### 🐛 Bug Fixes

- resolver: honor package.json#type for .jsx/.tsx extensions (#9690) (#9699) by @IWANABETHATGUY
- hmr: report the full-reload reason for the invalidate-loop case (#9708) by @hyf0
- explicit `moduleSideEffects` from a hook must take priority over the `package.json#sideEffects` (#9688) by @sapphi-red
- keep the `rolldown-runtime` name for the standalone runtime chunk (#9685) by @shulaoda
- lazy-barrel: request all exports for entry barrels on first encounter (#9672) by @shulaoda
- finalizer: skip init_*() for tree-shaken wrapped ESM owners (#9669) by @IWANABETHATGUY
- order `chunk.imports` by execution order (#9654) by @chuganzy
- vite-resolve: preserve slash separators for Sass partial exports (#9546) by @cjc0013
- cross-chunk CJS wrapper shadowed by author-local binding (#9648) by @IWANABETHATGUY

### 🚜 Refactor

- precompute wrapped-ESM init metadata in generate stage (#9712) by @IWANABETHATGUY
- ecmascript_utils: fold construction ext traits onto AstFactory and delete AstSnippet (#9702) by @hyf0
- finalizer: finish ScopeHoistingFinalizer migration to AstFactory (#9701) by @hyf0
- finalizer: migrate module_finalizers/mod.rs to AstFactory (#9700) by @hyf0
- hmr: migrate hmr finalizer to AstFactory (#9695) by @hyf0
- plugin: migrate vite_build_import_analysis to AstFactory (#9693) by @hyf0
- scanner: migrate tweak_ast_for_scanning to AstFactory (#9683) by @hyf0
- always split runtime module first (#9419) by @IWANABETHATGUY

### 📚 Documentation

- tsconfig: correct auto-discovery resolution to match TypeScript (#9714) by @shulaoda
- design: plan to unify all internal AST construction (#9673) by @hyf0
- tsconfig: align reference resolution docs with TypeScript behavior (#9641) by @shulaoda

### ⚡ Performance

- avoid per-module join Strings in scope-hoisting concatenation (#9645) by @Boshen
- avoid intermediate Strings in the ESM export clause (#9644) by @Boshen
- reuse a scratch buffer for facade namespace names in the scanner (#9642) by @Boshen
- reuse the import-matching tracker stack across named imports (#9643) by @Boshen
- avoid cloning the per-chunk export-items map in render_chunk_exports (#9639) by @Boshen
- avoid CompactStr allocation in sorted-exports membership check (#9640) by @Boshen

### 🧪 Testing

- add more `moduleSideEffects` precedence tests (#9689) by @sapphi-red
- 9651: drop shimMissingExports from regression fixture (#9674) by @IWANABETHATGUY

### ⚙️ Miscellaneous Tasks

- update react repo links (#9711) by @iiio2
- remove outdated pnpm configurations (#9666) by @btea
- deps: update github actions to v2.81.5 (#9665) by @renovate[bot]
- testing: migrate test harness off deprecated inlineDynamicImports (#9710) by @IWANABETHATGUY
- hmr: delete commented-out dead code left from old register-module codegen (#9707) by @hyf0
- deps: update napi-rs toolchain (#9706) by @shulaoda
- deps: update rollup submodule for tests to v4.61.1 (#9676) by @rolldown-guard[bot]
- deps: update test262 submodule for tests (#9677) by @rolldown-guard[bot]
- deps: update oxc to 0.135.0 (#9670) by @Boshen
- pass ALGOLIA_APP_ID and ALGOLIA_API_KEY to void deploy (#9667) by @Boshen
- deps: update github actions (#9662) by @renovate[bot]
- deps: update rust crates (#9663) by @renovate[bot]
- deps: update rolldown-plugin-dts to v0.25.2 (#9661) by @renovate[bot]
- deps: update typos to v1.47.2 (#9660) by @renovate[bot]
- deps: update docs dependencies (#9657) by @bddjr
- deps: update typos to v1.47.1 (#9655) by @renovate[bot]
- deploy website in its own workflow, only on docs output change (#9650) by @Boshen
- publish to pkg.pr.new add pm and `commentWithDev` option (#9638) by @btea

### ❤️ New Contributors

* @chuganzy made their first contribution in [#9654](#9654)
* @cjc0013 made their first contribution in [#9546](#9546)