## [1.1.4] - 2026-07-01

### 🚀 Features

- disable `experimental.lazyBarrel` by default (#10071) by @shulaoda

### 🐛 Bug Fixes

- dev: disable lazy barrel in dev mode (#10060) by @shulaoda
- generate: keep full JSON interface under preserveModules namespa… (#10056) by @IWANABETHATGUY
- check finalize_other_specifiers in its own Debug attribute (#10032) by @shulaoda
- serialize the KeepAssign unused minify option as "keep_assign" (#10031) by @shulaoda
- keep fragments after the newline fragment in MagicString::last_line (#10023) by @shulaoda
- generate: undeclared JSON named exports under preserveModules (#10020) (#10027) by @IWANABETHATGUY
- deconflict: rename CJS-wrapped locals that shadow chunk-root bindings (#9921) by @IWANABETHATGUY
- rolldown: keep entry facade when a shared chunk holds another entry's module (#9997) by @hyf0
- treeshake: also bail JSON default split when the object escapes (#9996) by @IWANABETHATGUY
- don't classify await in a strict-mode function as top-level await (#9987) by @shulaoda
- avoid spurious leading newline in addon hooks (banner/footer/intro/outro) (#9989) by @shulaoda
- handle JSON default mutation bailouts (#9972) by @TheAlexLichter
- plugin: make lazy hook metadata enumerable (#9991) by @TheAlexLichter
- dev: make init errors in lazy-compiled modules catchable (#9981) by @h-a-n-a
- treeshake: keep computed-key side effects on namespace member access (#9986) by @shulaoda
- binding: validate replace plugin delimiters length instead of panicking (#9984) by @shulaoda
- reconstruct nested rest patterns in into_expression (#9980) by @IWANABETHATGUY
- reconstruct rest patterns as spread in into_expression (#9976) by @shulaoda
- preserve export keyword on multi-declarator exports under keepNames (#9974) by @shulaoda
- deterministically keep the shortest name for deduplicated assets (#9948) by @x1024
- treeshake: apply @__NO_SIDE_EFFECTS__ to cross-chunk namespace calls (#9960) by @IWANABETHATGUY

### 🚜 Refactor

- drop redundant program scope enter/leave in finalizer (#10049) by @shulaoda
- deconflict: extract collect_chunk_scope_captured_names (#10006) by @IWANABETHATGUY
- unify pre-scan multi-declarator split into one decision site (#9982) by @IWANABETHATGUY
- common: return bool from SymbolRef::is_not_reassigned (#9962) by @IWANABETHATGUY

### 📚 Documentation

- rolldown: remove outdated comment for removing parenthesized expression (#10062) by @Dunqing
- use GitHub-flavored alert for Etiquette note in contribution guide (#10012) by @IWANABETHATGUY
- replace: explain the delimiters left and right boundaries (#9985) by @shulaoda
- ast-mutation: remove stale Address Use section after pre-scan refactor (#9983) by @IWANABETHATGUY
- remove fathom (#9968) by @mdong1909
- contribution-guide: code-format main branch references (#9966) by @IWANABETHATGUY
- contribution-guide: fix stale REPL note and tidy wording (#9957) by @hyf0
- contribution-guide: clarify when to discuss before opening a PR (#9955) by @hyf0

### ⚡ Performance

- disable preserve_parens across all parse paths (#10057) by @Dunqing
- common: inline declared_symbols with SmallVec (#9920) by @IWANABETHATGUY
- common: pack TaggedSymbolRef into 8 bytes (#9919) by @IWANABETHATGUY
- sourcemap: skip newline scan on the no-sourcemap join fast path (#9936) by @Boshen

### 🧪 Testing

- dev: error in lazy module should be catchable (#9975) by @sapphi-red
- dev: reject unknown lazy compile modules (#9969) by @sapphi-red

### ⚙️ Miscellaneous Tasks

- deps: update actions/cache action to v6 (#10001) by @renovate[bot]
- trigger vite ecosystem-ci from PR comments (#10058) by @shulaoda
- deps: update napi to v3.10.0 (#10063) by @renovate[bot]
- remove unused From impl for RolldownLabelSpan (#10055) by @shulaoda
- remove dead Diagnostic::with_kind method (#10054) by @shulaoda
- remove unused StatementExt methods (#10053) by @shulaoda
- remove unused ExpressionExt methods (#10052) by @shulaoda
- remove commented-out re_export_all_names field (#10051) by @shulaoda
- deps: update pnpm to v11.9.0 (#10047) by @renovate[bot]
- remove the unused BindingGenerateHmrPatchReturn napi type (#10034) by @shulaoda
- remove the dead inline_entry_chunk_wrapping scaffolding (#10037) by @shulaoda
- deps: bump oxc_resolver to 11.22.0 (#10045) by @Boshen
- remove never-constructed MatchImportKind::_Ignore variant (#10041) by @shulaoda
- remove the unused ScheduledBuild napi struct (#10033) by @shulaoda
- remove dead compute_hmr_update_single method (#10040) by @shulaoda
- drop the redundant visited.insert in manual code splitting (#10038) by @shulaoda
- remove the dead output_assets vector in render_chunk_to_assets (#10036) by @shulaoda
- remove the unused From<String>/Display impls for BindingLogLevel (#10035) by @shulaoda
- deps: upgrade oxc to 0.138.0 and migrate to per-type AST construction (#10018) by @shulaoda
- deps: update rust crates (#9911) by @renovate[bot]
- deps: update test262 submodule for tests (#10016) by @rolldown-guard[bot]
- deps: update github actions (#9999) by @renovate[bot]
- deps: update npm packages (#10000) by @renovate[bot]

### ◀️ Revert

- "fix(plugin): make lazy hook metadata enumerable (#9991)" (#10005) by @shulaoda

### ❤️ New Contributors

* @x1024 made their first contribution in [#9948](#9948)

Co-authored-by: shulaoda <[email protected]>

Follow-on after #10018.

First of a series of PRs all grouped around 2 themes:

1. Shorten code using AST builder methods.
2. Reduce string allocations.

The new AST builder methods allow shortened syntax. Utilize the shorter methods wherever possible.

Before:

```rust
ast::Statement::ExpressionStatement(ast::ExpressionStatement::boxed(span, call_expr, &self.ast_builder))
```

After:

```rust
ast::Statement::new_expression_statement(span, call_expr, &self.ast_builder)
```

Note: Diff is quite large, but these changes were almost entirely produced using the same [deterministic codemod](https://github.com/oxc-project/oxc/tree/overlookmotel/ast-builder-codemod) we used to migrate Oxc repo to new AST builder, with only some final tweaks by an LLM. I've reviewed it all and, even though I'm unfamiliar with Rolldown's codebase, I'm pretty confident it looks correct.

Follow-on after #10018.

The new AST builder methods allow passing arrays where a `Vec` is required. Use this facility to remove a lot of repetitious boilerplate.

Before:

```rust
FunctionBody::new(
  SPAN,
  oxc::allocator::Vec::new_in(&self.ast_builder),
  oxc::allocator::Vec::from_value_in(try_stmt, &self.ast_builder),
  &self.ast_builder,
)
```

After:

```rust
FunctionBody::new(SPAN, [], [try_stmt], &self.ast_builder)
```

Note: Like #10418, diff is quite large, but these changes were almost entirely produced using the same [deterministic codemod](https://github.com/oxc-project/oxc/tree/overlookmotel/ast-builder-codemod) we used to migrate Oxc repo to new AST builder, with only some final tweaks by an LLM. I've reviewed it all and, even though I'm unfamiliar with Rolldown's codebase, I'm pretty confident it looks correct.

Follow-on after #10018.

AST builder methods accept any type which is `Into<Str<'ast>>` for `Str` fields. This includes `&'static str`s. Where we have a `&'static str`, pass it directly to the builder method, rather than via `Str::from_str_in`.

This avoids unnecessarily allocating the string into the arena. As a side effect, it also makes the code shorter and more readable.

Before:

```rust
ast::BindingPattern::new_binding_identifier(
  SPAN,
  ast::Str::from_str_in("m", &self.ast_builder),
  &self.ast_builder,
)
```

After:

```rust
ast::BindingPattern::new_binding_identifier(SPAN, "m", &self.ast_builder)
```

)

Follow-on after #10018, continuation of #10420.

Custom AST builder methods (previously methods of `AstFactory`) take `&str`s. They allocate the string into arena, to obtain a `&'ast str` (allocator lifetime). Where the string is a `&'static str`, it's unnecessary to allocate into arena to extend the lifetime.

In these cases, use standard AST builder methods provided by Oxc, and skip the allocation.

Before:

```rust
BindingIdentifier::new_id(SPAN, "__rolldown_default__", &self.ast_builder)
```

After:

```rust
BindingIdentifier::new(SPAN, "__rolldown_default__", &self.ast_builder)
```

Follow-on after #10018, continuation of #10420 and #10421.

When converting `&'static str`s to `Str`s, use `Str::from` instead of `Str::from_str_in`. The difference is that `from_str_in` performs an allocation (in arena), whereas `from` is a zero-cost no-op conversion at runtime. When the `&str` already has a `'static` lifetime, it's unnecessary to extend it by allocating it into arena.

Before:

```rs
TemplateElementValue {
  raw: Str::from_str_in("/@vite/lazy?id=", &self.ast_builder),
  cooked: None,
}
```

After:

```rs
TemplateElementValue { raw: Str::from("/@vite/lazy?id="), cooked: None }
```

Follow-on after #10018, continuation of #10420 and #10421.

Where we already have a `Str<'ast>` or `Ident<'ast>`, avoid converting it into a `&str` and then allocating it back into arena again to convert back to `Str` or `Ident`. Just re-use the existing `Str` / `Ident`. This avoids unnecessary arena allocations, and in the case of `Ident`, it avoids re-hashing the string too.

Follow-on after #10018 and #10353. Pure refactor.

Implement `GetAstBuilder` and `GetAllocator` on visitor/pass/context types which hold an `AstBuilder`.

AST builder methods take any `&B where B: GetAstBuilder`, so this allows removing a lot of repetitious boilerplate code at call sites.

Before:

```rust
Expression::new_string_literal(
  SPAN,
  Str::from_str_in(id, &self.ast_builder),
  None,
  &self.ast_builder,
)
```

After:

```rust
Expression::new_string_literal(SPAN, Str::from_str_in(id, self), None, self)
```