Changelog

[unreleased]

Bug Fixes

• (es/minifier) Preserve array.join with nullable values (#10937) (e495403)

• (es/preset-env) Update polyfill data (#11013) (934d8a5)

Features

• (es/minifier) Remove unused parts of destructuring (#11024) (b5fed8c)

Refactor

• (es/react) Add preserve supports (#11025) (bc83875)

[1.13.4] - 2025-08-21

Bug Fixes

• (es/lexer) Use error when handling '\0' (#10964) (53c22d1)

• (es/minifier) Skip serde of pure_funcs in options (#10969) (862e70d)

• (es/minifier) Fix compile error with debug feature (#10999) (831eed5)

• (es/minifier) Don't eliminate class expr if some side effects contain this (#11003) (18aeac6)

• (es/module) Support optional chaining in import.meta (#10985) (758d8ec)

• (es/parser) Allow TS type args to start with LSHIFT (<<) to parse T<<S>() => void> (#10996) (4911ec7)

• (ts/isolated-dts) Correct optional marker for class fields generated from constructor parameter (#10992) (0d680fd)

• Expose GlobalPassOption.build (#10968) (c8a2668)

Features

• (bindings/html) Add keep-head-and-body for tagOmission in binding (#11014) (1e1ebeb)

• (html/minifier) Support keep_head_and_body (#11008) (86186db)

• (plugin/runner) Introduce wasmtime backend (#10958) (9fa8330)

Miscellaneous Tasks

• (es/minifier) Make a computation lazy (#11004) (a4aa0ec)

Performance

• (es/ast) Remove alloc in leftmost api (#11005) (f59f233)

• (es/minifier) Use bitflags for context of the Pure pass (#10953) (8cd5c58)

• (es/minifier) Reduce alloc (#10961) (6475070)

• (es/minifier) Remove useless clone (#10970) (8873f65)

• (es/minifier) Reduce clone (#10982) (4f2ed0d)

• (es/minifier) Use bitflags for DropOpts (#10990) (79206f1)

• (es/parser) Remove EOF check (#10976) (a10dada)

• (es/parser) Introduce checkpoint to reduce clone (#11001) (cda08d1)

• (es/parser) Remove useless Rc<RefCell<T>> (#11002) (39f5784)

• (es/parser) Remove OneDirectionalList and reduce allocation of Vec (#11000) (0088ab8)

Refactor

• (common) Remove SyntaxContextData#opaque (#10983) (d5be248)

• (es/minifier) Remove useless branch (#10966) (e400de3)

• (es/minifier) Remove duplicate report assign (#11009) (9590e1d)

• (es/parser) Remove useless methods (#10980) (91c6039)

• (hstr) Use default inline strategy (#10954) (d160f7f)

• (hstr) Remove needlesss unwrap (#10959) (953f75f)

• (plugin/runner) Introduce abstract runtime (#10943) (a445156)

• (plugin/runner) Switch wasmtime-wasi to wasi-common (#10979) (c4114d5)

• Add #[deny(unused)] (#10997) (1bb3716)

[1.13.3] - 2025-07-29

Bug Fixes

• (es/minifier) Check exported when optimize last expr (#10939) (f6f15f3)

• (es/minifier) Disallow types (#10945) (63172ef)

• (es/minifier) Don't optimize Number properties when Number is shadowed (#10947) (40a1e2e)

• (es/minifier) Fix cycle detection (#10950) (212d8bc)

• (es/parser) Correctly handle EOF position (#10934) (dd70fbd)

Performance

• (es/minifier) Remove visitor of CharFreqAnalyzer (#10928) (65534ff)

• (es/minifier) Remove pre-compress pass (#10932) (c7f0e4d)

• (es/minifier) Use bitflag for var kind (#10940) (4317988)

• (es/minifier) Remove needless clone (#10949) (b5e5e8c)

• (es/parser) Reduce comparison (#10933) (e44fbd4)

• (es/parser) Reduce comparison (#10941) (a262eeb)

[1.13.2] - 2025-07-22

Bug Fixes

• (es/minifier) Remove the last break in the second switch (#10923) (3ed4a12)

• (es/parser) Reject malformed phase import statements (#10912) (5fde348)

• (swc_core) Add default-features = false to drop stacker (#10916) (38b45b7)

Features

• (es/compiler) Improve structure (#10903) (0cc6743)

• (es/compiler) Merge private_in_object and static_blocks (#10909) (c1405da)

• (es/compiler) Merge logical assignments (#10914) (ccbfcd1)

• (es/compiler) Merge export_namespace_from (#10917) (ba6cc71)

• (es/renamer) Add renamer_keep_contexts (#10907) (1b15171)

Miscellaneous Tasks

• (claude) Use Opus and allow assigning to the claude-bot (3275b9c)

Performance

• (es/lexer) Remove option for handler (#10881) (1ad8506)

• (es/lexer) Reduce memory move (#10906) (145fba4)

• (es/lexer) Reduce context query (#10910) (443aa1c)

• (es/lexer) Reduce query and comparison (#10919) (400c996)

• (es/minifier) Make get_type for === lazy (#10920) (4eab8e8)

• (es/minifier) Reduce get_type calls (#10922) (9d55e88)

• (es/parser) Reduce check during parsing binding (#10905) (92ca5ec)

• (es/parser) Reduce comparison (#10911) (e00c178)

Refactor

• (es/compat) Initialize compiler API (#10902) (d6566ee)

• (es/lexer) EOF Token (#10880) (54c866a)

• (es/parser) Reduce input_mut() calls (#10899) (1816368)

• (es/parser) Remove unnecessary PResult (#10900) (27e548d)

• (es/preset-env) Apply swc_ecma_compiler in preset env (#10921) (6f5b72a)

Testing

• (es/minifier) Update #10918 test case (#10924) (57fb106)

[1.13.1] - 2025-07-19

Bug Fixes

• (es/compat) Properly handle rest assignment in for-in/of RHS (#10883) (5d11851)

• (es/decorators) Handle empty class members (#10892) (fe44972)

• (es/minifier) Hoist props when only props are used (#10891) (452fc98)

• (es/minifier) Recursively check stmt for variable when inlining function (#10896) (e37a93d)

• (es/minifier) Termination check when stmts containing switch (#10898) (4429b20)

• (es/parser) Fix parsing of JSX identifiers (#10894) (0047c39)

• (ts/fast-strip) Strip private method overloads (#10886) (cdb6e87)

Testing

• (es/minify) Verify fixed issue (#10888) (86c1dca)

[1.13.0] - 2025-07-17

Bug Fixes

• (es/lexer) Disallow legacy octal literals as BigInt (#10867) (430fbf4)

• (es/minifier) Restrict IIFE inlining in class contexts (#10879) (a01b54a)

• (es/parser) Mark static as reserved in strict mode (#10861) (5bdddd7)

Features

• (es/minifier) Drop unused rest paramters (#10857) (5305486)

• (es/minifier) Enhance IIFE invoker for arrow functions (#10860) (2b1ce3d)

• (plugin/runner) Use wasmer-wasix sys-minimal feature to reduce binary size (#10638) (b5f704a)

Performance

• (es/lexer) Reduce comparison while reading numbers (#10864) (c6ba5c2)

• (es/lexer) Remove unnecessary check when reading keywords (#10866) (4aefe0e)

• (es/parser) Reduce comparisons (#10862) (3bd9aad)

• (es/parser) Remove useless alloc (#10865) (3ebf088)

• (es/parser) Reduce token query (#10869) (d93ef64)

• (es/parser) Remove duplicate check (#10872) (fe76460)

• (es/parser) Remove duplicate check (#10874) (064123b)

• (swc_error_reporters) Avoid creating miette handler when no diagnostics (#10852) (93b318f)

Refactor

• (es/lexer) Avoid passing convert (#10868) (77393f8)

• (es/minifier) Cleanup (#10882) (2595cb1)

• (es/parser) Remove duplicate check for reservedness (#10850) (4897bfd)

• (es/parser) Remove span swap operation in parser (#10854) (32f4bb8)

[1.12.14] - 2025-07-14

Bug Fixes

• (es/minifier) Don't inline arrow when it contain this (#10825) (8b43bb3)

• (es/parser) Make export in NS to not affect file type (#10799) (ae22033)

• (es/parser) Correctly check ambient context (#10802) (f97ea03)

Features

• (es/parser) Enable support for dynamic import with defer phase (#10845) (097d29d)

• (plugin) Remove bytecheck to make Wasm plugins backward compatible (#10842) (30ad808)

Miscellaneous Tasks

• (bindings) Fix dependency issues (7c57fbb)

• (deps) Update class-validator to avoid comments (#10819) (bacfa4b)

• (ide) Enable --workspace for rust-analyzer check (#10809) (92647ff)

Performance

• (es/minifier) Use u8 for remaining_depth (#10833) (ed6956a)

• (hstr) Inline one more byte (#10817) (3886c97)

• (hstr) Remove static tag (#10832) (66ae1e8)

Refactor

• (es/helpers) Make inline helpers optional at compile time (#10808) (53f3881)

• (es/lexer) Don't store buffer in lexer (#10830) (cac40f1)

• (es/lints) Remove warnings without features (#10794) (41d507f)

• (es/parser) Reduce token query (#10834) (5cd5185)

• (es/parser) Reduce call to parse_decorators (#10846) (356d3a0)

• (es/parser) Remove duplicate check (#10847) (2b04efd)

• (es/preset-env) Use strpool,phf for corejs2 data (#10803) (1652fd8)

• (es/react) Remove redundant replace calls (#10795) (a670b37)

• (es/react) Remove count_children (#10818) (2116ab2)

• (hstr) Cleanup duplicate header (#10812) (630dde9)

• (hstr) Make the deallocation of Atoms explicit (#10813) (406433d)

• (hstr) Remove is_global (#10820) (afda0f9)

Testing

• (es/plugin) Test memory layout of archived types (#10841) (502e991)

[1.12.11] - 2025-07-08

Bug Fixes

• (ci) Fix CI (#10790) (b3f9760)

• (es) Use default-features = false for swc crate usages (#10776) (50b2eac)

• (es) Make swc_typescript optional (#10792) (c32569d)

• (preset-env) Fix default value for caniuse (#10754) (aa4cd5b)

• (preset-env) Revert default value (#10778) (7af5824)

Features

• (es/minifeir) Inline lazily initialized literals (#10752) (fd5d2e2)

• (es/minifier) Evaluate Number.XXX constants (#10756) (c47dab5)

• (es/minifier) Implement partial evaluation of array join (#10758) (bdf3a98)

• (swc_core) Expose swc_ecma_parser/unstable (#10744) (db0679e)

Miscellaneous Tasks

• (common) Remove clone() in proc macro (#10762) (12e3180)

• (deps) Update browserslist-rs to 0.19 (#10750) (f8bf21c)

• (deps) Remove unused deps with cargo-shear (#10765) (f4e4974)

• (es/module) Drop node feature of swc_ecma_loader (#10761) (44471b5)

• (plugin/runner) Remove unused feature and dependency (#10764) (a7d8a0a)

Performance

• (es/lexer) Use bitflags for Syntax (#10676) (bf8c722)

• (es/lexer) Do not scan number if there's no underscore (#10788) (f5d92ee)

• (es/lints) Make rules not parallel (#10772) (4e6001c)

• (es/lints) Merge critical rules (#10773) (816e75a)

• (es/parser) Reduce the number of context set ops (#10742) (08b4e8b)

• (es/parser) Reduce value set operations for context (#10751) (4976b12)

• (es/parser) Reduce query ops of current token (#10766) (4304f91)

• (es/parser) Remove useless call in parse_ident (#10770) (4ca12c9)

• (es/renamer) Reduce time complexity in case of conflict (#10749) (0279914)

• (hstr) Do not compare string during creating atoms (#10791) (43a4f11)

• Replace rayon with par-iter (#10774) (a6e6ebe)

Refactor

• (es) Make swc_ecma_lint optional for swc crate (#10767) (f80415b)

• (es/lexer) Use const fn in SyntaxFlags (#10737) (b9eb23a)

• (es/parser) Cleanup parse_setter_param (#10745) (70734f4)

• (es/parser) Cleanup typed-arena (#10769) (ce5138d)

• (es/parser) Cleanup for ctx (#10777) (d60a611)

• (es/parser) Delete with_ctx (#10779) (ce057c5)

• (es/parser) Cleanup (#10781) (176ce36)

• (es/preset) Remove deprecated preset_env function and feature module (#10759) (fa0e0ab)

• (es/preset-env) Use phf for corejs3 entry (#10712) (658b26d)

Testing

• (es/minifier) Update the terser test list (#10748) (1eace01)

• (es/minifier) Update the passing test list (#10782) (8aa888b)

• (es/parser) Add a test for duplicate labels (#10784) (28fc643)

Pref

• (hstr) Do not compare static tag (#10771) (5d3ce83)

[1.12.9] - 2025-07-01

Bug Fixes

• (es/lexer) Parse uppercase hex numbers correctly (#10728) (ead6256)

• (es/lexer) Allow keywords as jsx attribute names (#10730) (04ef20a)

• (es/minifier) Fix top level option (#10227) (485fced)

• (es/minifier) Do not drop self-referential class expressions (#10710) (39e6c2e)

• (es/minifier) Mark cons and alt of CondExpr as ref (#10740) (9649cc8)

• (es/minifier) Fix termination detection (#10741) (87bc698)

• (es/parser) Allow non-prop operand in delete (#10733) (38132e0)

Features

• (es/minifier) Hoist more properties (#10707) (0f2c8d5)

• (es/transforms) Expose tsEnumIsMutable to JS (#10716) (6b3ae00)

Performance

• (es/minifier) Make CharFreq::scan in mangler table-based (#10679) (04d39aa)

• (ts/fast-strip) Use swc_ecma_parser::Lexer (#10677) (ffe0292)

• Optimize Input::reset_to (#10719) (8084066)

Refactor

• (es/lexer) Useless reset (#10714) (c9eee0b)

• (es/lexer) Cleanup read_int (#10727) (c5fb4b1)

• (es/parser) Remove read_number_no_dot (#10703) (fa8607f)

• (es/parser) Remove needless branching (#10717) (b0c23b2)

Testing

• (es/preset-env) Add entry import bench (#10722) (9868b4d)

• Make codspeed concurrent on main branch (#10711) (4392ce3)

[1.12.7] - 2025-06-26

Bug Fixes

• (es/minifier) Fix condition for preserving properties (#10694) (5c57a05)

• (es/minifier) Drop pure tagged string call expr (#10702) (85cd9a7)

• (es/parser) Improve error message for template literals (#10690) (a066b76)

• (es/parser) Rescan >= for JSX closing tag (#10693) (fe82c4c)

• (es/parser) Support keywords as JSX member expression properties (#10701) (643253d)

Features

• (es/parser) Add override and out keyword (#10695) (636d7a3)

• (es/parser) Enable import attributes unconditionally (#10706) (5ecc3ca)

• (es/parser) Expose Token API with unstable feature flag (#10699) (750c7d4)

Performance

• (es/parser) Do not compare error each time (#10696) (0ae0341)

Testing

• (es) Remove outdated test snapshots (#10689) (03d520b)

[1.12.6] - 2025-06-24

Bug Fixes

• (es/parser) Throw error if JSX does not end with > (#10687) (cb3d6db)

• (es/react-compiler) Use tsx syntax for parser (#10682) (a355e37)

• (hstr) Support MSRV = 1.86 (#10673) (de19d1e)

• (ts/isolated-dts) Skip parameters without accessibility modifiers in private constructors (#10675) (1976d8e)

Features

• (ts/fast-strip) Support JSX under a feature flag (#10656) (6a70d17)

Miscellaneous Tasks

• (ecosystem-ci) Exclude react-leaflet (cfbb1f9)

Performance

• (es/lexer) Optimize number literal parsing with fast path (#10655) (15d0828)

• (es/lexer) Reduce allocations while lexing numbers (#10667) (115d228)

• (es/lexer) Introduce byte_search to reduce comparison operations (#10668) (3806ffd)

• (es/lexer) Compare \n first (#10669) (9c41e2f)

• (es/lexer) Optimize lexing of numbers with separators (#10665) (cac651b)

• (es/minifier) Remove needless clones (#10661) (5f4f7dd)

• (ts/fast-strip) Prealloc buf for codegen (#10680) (a8347fe)

Refactor

• (ts/fast-strip) Rename crate (#10685) (6b5904c)

Build

• (wasm) Fix wasm builds (eee0578)

[1.12.5] - 2025-06-21

Bug Fixes

• (es/parser) Parse jsx entity (#10652) (bfd3bc5)

• (es/parser) Consider reseved ident in jsx name (#10647) (9262a59)

Performance

• (es/parser) Optimize next_token (#10654) (1be2ca0)

Refactor

• (es/lexer) Remove faster path for \t (#10650) (d6ac3b7)

[1.12.4] - 2025-06-20

Bug Fixes

• (es/minifier) Fix Buffer handling of minify() API (#10643) (cdf068e)

• (es/minifier) Fix arrow inlining (#10642) (7232c10)

• (es/parser) Don't be greedy in the end of jsx open el (#10637) (8a2c656)

• Update par-core and par-iter (#10629) (38f7d51)

• Fix CI (#10641) (9df98f7)

Refactor

• (es/parser) Cleanup (#10631) (c7c2035)

[1.12.3] - 2025-06-19

Bug Fixes

• (es/codgen) Emit leading comments of JSXExprContainer (#10627) (2d2162a)

[1.12.2] - 2025-06-19

Bug Fixes

• (ci) Fix build of @swc/minifier (0dc5244)

• (es/codegen) Fix .map path when using output_path (01e5bd1)

• (es/parser) Allow type ann in jsx expr child (#10626) (48f576c)

• (swc) Fix wrong caching of resolvers regarding file exts (#10615) (68aacd1)

• (ts/isolated-dts) Fix usage dependency (#10621) (b3677d3)

• (ts/isolated-dts) Emit properties in overloaded constructor params (#10623) (6634ef1)

Features

• (swc_common) Allow returning None in try_lookup_source_file (#10625) (d8e2405)

Performance

• (atoms) Improve atom! for inlinable strings (#10612) (5113121)

• (es/minifier) Avoid calling some costly function when optimizing deep nested binary expr (#10611) (1434571)

• (es/minifier) Remove needless JSON conversion (#10628) (4a58dca)

• (es/parser) Reduce cmp in jsx spread child (#10606) (fb33c13)

Refactor

• (es/parser) Cleanup - deduplicate some code (#10608) (5f9af96)

• (es/parser) Remove token contexts (#10547) (7ffe9d2)

[1.12.1] - 2025-06-12

Bug Fixes

• (@swc/types) Remove nativeClassProperties (#10592) (39032dc)

• (es/minifier) Fix top level detection of DCE (#10603) (964a560)

• (es/minifier) Fix inlining of arrows (#10604) (cc3bc4d)

• (es/minifier) Perform DCE on the end (#10602) (a97b149)

• (swc_common) Add Files#is_in_file (#10599) (e6b61eb)

Features

• (es/parser) Support parsing CommonJS (#10600) (70bda6a)

[1.12.0] - 2025-06-10

Bug Fixes

• (@swc/types) Add jsc.output.charset (#10567) (26b41e8)

• (es/codegen) Don't call cmt.get_leading for dummy span (#10568) (16e204d)

• (es/parser) Disallow spread operator(...) in JSX attribute values (#10587) (8deba78)

• (es/typescript) Pass native_class_properties (#10561) (7e4cd9a)

• (es/typescript) Handle export declare var in namespace (#10579) (2daa17f)

• (ts/isolated-dts) Add edges SymbolFlags::Value and SymbolFlags::Type in exports (#10577) (e6d4da2)

• Fix bindings (0f858fd)

Documentation

• (contributing) Add a script to patch local projects (#10565) (3ac0a21)

Features

• (es/minifier) Regex support for format.comments (#10571) (e441df5)

• (es/module) Add support for import.meta.main in AMD and CJS (#10596) (759de2e)

Miscellaneous Tasks

• (plugin/runner) Update virtual-fs to dedupe dependencies (#10594) (de667bb)

Refactor

• (es/lexer) Remove unnecessary result wrap (#10578) (49d15df)

• (es/parser) Extract parse_jsx_attrs (#10569) (6492786)

• (es/parser) Remove cur!(false) macro (#10583) (c96fa23)

• (swc_common) Remove Input::find (#10542) (494cef9)

• (swc_common) Use BytesStr instead of Lrc<String> (#10580) (6f00973)

• (swc_common) Use swc_sourcemap instead (#10593) (8a9f609)

Testing

• (es/parser) Enable jsx test (#10566) (72b1efe)

[1.11.31] - 2025-06-05

Bug Fixes

• (es/codegen) Improve comments handling (#10534) (d9ba838)

• (es/codegen) Exclude constructor from source map names (#10551) (ef85640)

• (es/fixer) Fix a bug with awaited arrow fn expression (#10555) (9dfdfa6)

• (es/minifier) Fix missing variable (#10478) (6de3ef6)

• (es/minifier) Inline object of member if prop is an ident (#10548) (e554381)

• (es/minifier) Add side effect check for test expr when compressing IfStmt (#10550) (3e9728e)

• (es/minifier) Fix typo in an option name (#10554) (a303941)

• (es/parser) Emit syntax errors for strict mode in non-module or scripts (#10545) (1291b4a)

• (es/react-compiler) Fix usefulness detection (#10506) (41075a1)

• (es/utils) Fix extract_var_ids (#10511) (5644372)

• (react-compiler) Fix fast check (#10538) (9403ce2)

• (swc_common) Fix build (#10544) (2ed934d)

• (swc_common) Fix skip condition for sourcemap (#10562) (cbee0df)

• (swc_common) Fix skip condition for sourcemap, really (#10563) (14feedb)

• (swc_common) Revert skip condition patch (#10564) (2a2b284)

• (ts/fast-dts) Correctly emit Symbol-keyed accessors in declarations (#10508) (1298e76)

• (ts/fast-dts) Ensure correct emission of template literals and symbol-keyed properties (#10530) (8dbdbef)

Features

• (es/regexp) Add crates for RegExp (#10525) (4b3f924)

• (swc_common) Add Globals::clone_data (#10543) (39f30b0)

• (swc_common) Add map_raw_pos to Files (#10560) (71224c3)

Miscellaneous Tasks

• (bindings) Use published versions of crates (#10513) (f65f028)

• (ecosystem-ci) Exclude ts-node (2b284e1)

Performance

• (es/minifier) Merge PropertyCollector into usage analyzer (#10514) (505bf54)

• (es/minifier) Remove needless clone (#10523) (1c02ef6)

• (es/parser) Reduce comparison while reading logical (#10526) (2bc551c)

• (es/renamer) Merge analyze/collect (#10509) (7b47f66)

• (swc_common) Remove char_indices calls (#10541) (51507bc)

Refactor

• (es/codegen) Migrate to ryu-js for numeric literal codegen (#10503) (4bc4244)

• (es/lexer) Cleanup code for reading tokens (#10533) (a72092c)

• (es/lexer) Share skip_block_comment (#10549) (b101a87)

• (es/parser) Share code for parsing strings (#10522) (931a2d6)

• (es/parser) Cleanup (#10559) (963ac9e)

• (ts/fast-dts) Derive computed flags from source code (#10510) (a2d5664)

[1.11.29] - 2025-05-21

Bug Fixes

• (@swc/types) Add transform.nativeClassProperties (#10418) (f3af44c)

• (@swc/types) Add resolveFully to BaseModuleConfig (#10426) (164cbaa)

• (ci) Remove wasmer override (425eeb9)

• (es/compat) Properly handle rest assignment in for-in/of head (#10489) (b9c0446)

• (es/jest) Hoisting vars with names starting with mock (#10410) (a29eb29)

• (es/jest) Revert #10410 (#10452) (bc756f8)

• (es/minifier) Properly handle object shorthand syntax during compression (#10467) (bae4940)

• (es/module) Handle __proto__ export name (#10420) (1b94c7a)

• (es/optimization) Support decimal numbers in jsonify (#10424) (affdec2)

• (es/react-compiler) Mark function components declared as a var interesting (#10437) (5eac076)

• (es/renamer) Fix (broken) identifier preserving API (#10474) (06c64cf)

• (ts/fast-dts) Emit readonly for Object getter prop (#10492) (6c03e20)

• (ts/fast-dts) Align object getter/setter emit behavior with TypeScript (#10502) (78c754e)

Features

• (common) Allow using build_sourcemap with multiple SourceMap (#10438) (2a07c8a)

• (common) Add ignoreList support for sourcemap (#10442) (6750459)

• (config) Allow using glob in some places (#10445) (f7a6359)

• (config) Use globset instead (#10446) (7bbaef8)

• (es/module) Add support for stripping "node:" prefix in imports and exports (#10461) (ae2ff62)

• (es/react-compiler) Initialize support crate (#10422) (1e88e6b)

• Initialize @swc/react-compiler (#10475) (883b24c)

Miscellaneous Tasks

• (es/minifier) Remove useless check (#10471) (ca85958)

Performance

• (common) Accept owned instance of sourcemap::SourceMap (#10463) (6ee439a)

• (es/minifier) Use fxhash for DCE (#10440) (c0ddd96)

• (es/minifier) Remove needless collect_decls call (#10450) (8e4b6ce)

• (es/minifier) Clear graph eagerly in DCE (#10455) (31e21d7)

• (es/minifier) Perform full analysis only once for DCE (#10454) (61baf84)

• (es/minifier) Use bitflags for var info (#10459) (36f8385)

• (es/optimization) Rely on resolver from inline_globals (#10449) (1978809)

• (es/renamer) Merge Id/Def collector (#10487) (73377f0)

• (es/utils) Make IdentUsageFinder parallel (#10444) (d074bca)

• (es/utils) Stop visiting once found in EvalFinder (#10483) (3402270)

Refactor

• (common) Remove useless &mut (#10405) (edbeb49)

• (common) Remove unused methods (#10469) (b77311a)

• (ecma/transform) Cleanup rename analyzer (#10500) (de51be1)

• (es) Remove unused code (#10460) (d344133)

• (es) Deduplicate EvalFinder (#10472) (9f104af)

• (es/minifier) Remove unused file (#10465) (7d49097)

• (es/minifier) Merge label/private name renamer (#10480) (5add84d)

• (es/parser) Split parser into also-lex/parse-only (#10399) (26289ab)

• (es/parser) Parse shebang and cleanup (#10481) (619873a)

• (es/parser) Cleanup usage of is! and bump! (#10490) (b695b68)

• (es/renamer) Inline get_unresolved (#10493) (0f5d9c1)

• (es/transforms) Unify preset_env and es_version transform (#10451) (6546c27)

Build

• (plugin) Update wasmer to v6.0.0 (#10439) (b9eff3c)

• Update rustc to nightly-2025-05-06 (#10443) (a7cbde7)

[1.11.23] - 2025-04-29

Bug Fixes

• (es/compat) Remove PURE mark from _async_to_generator (#10414) (1c6f65c)

• (es/proposal) Preserve class id for hoisted classes when transforming using declarations (#10407) (b703f21)

Refactor

• Use debug level tracing for ast related tracing (#10411) (3a0fa99)

[1.11.22] - 2025-04-23

Bug Fixes

• (es/parser) Parse export default from; with exportDefaultFrom: true option (#10373) (a270cb0)

• (es/proposal) Fix exported class for explicit-resource-management (#10393) (6b5dbc6)

• (swc_core) Fix downstream doc builds (#10401) (df511ba)

• Upgrade browserslist-rs version (#10389) (f802892)

Features

• (bindings/core) Enhance existing parse function to accept both string and buffer types(#10371) (c9a2afc)

• (css/prefixer) Fix default implementation (#10351) (34f4e41)

Miscellaneous Tasks

• (bindings/node) Add README.md (#10402) (a0e89f0)

• (es/parser) Remove useless check (#10386) (d1770ac)

• (es/utils) Mark Symbol members as literal (#10400) (3935b60)

Performance

• (common) Use next instead of nth (#10403) (12c2807)

• (es/minifier) Use bigflags to reduce context size of analyzer (#10380) (773d19c)

• (es/minifier) Use bitflags to reduce context size of InfectionCollector (#10387) (126d432)

• (es/minifier) Use bitflags to reduce compress context size (#10381) (99495bd)

• (es/parser) Move found_module_item to Parser (#10388) (fd52c5c)

Refactor

• (es/compat) Simplify async_to_generator (#10341) (e9eeba1)

• (es/lexer) Split lexer (#10377) (3ef2bd1)

Testing

• (es/transform) Add tests for source map (#10375) (0018a8e)

[1.11.21] - 2025-04-14

Bug Fixes

• (es/helpers) Sync tslib _ts_generator implementation (#10366) (d3fb992)

• (es/proposal) Fix scope of declarations for explicit-resource-management (#10362) (eb7f7e9)

• (ts/fast-strip) Increase Wasm stack size (#10359) (6d444a5)

Miscellaneous Tasks

• (es/parser) Remove useless check (#10363) (0f6a8c3)

Performance

• (es/parser) Reduce string comparison (#10355) (21789c4)

• (es/parser) Add initial capacitity for some vectors (#10361) (7b7b50e)

• (es/parser) Reduce clone of token contexts (#10364) (3ab47b2)

• (es/parser) Use bitflags to reduce parser context size (#10367) (a2d3596)

• (es/parser) Replace byte arguments with generics (#10370) (68f7667)

• (es/parser) Use arrayvec and unsafe push to optimize escaped string parsing (#10369) (e12ae1c)

[1.11.20] - 2025-04-11

Bug Fixes

• (error_reporters) Removing unused code to fix clippy check (#10338) (5970f93)

• (es/minifier) Preserve block with block scoped declaration (#10335) (a4ac3b7)

• (es/parser) Allow abstract method named accessor (#10327) (3f71776)

• (es/preset-env) Consider browserslist config if env.target is not configured (#8921) (a2dc372)

• (es/resolver) Handle using declarations (#10354) (dad815c)

• fix(es/compat): Remove one promise tick in yield* (tc39/ecma262#2819) (#10317)

Related issue:

• babel/babel#14877
• tc39/ecma262#2819 (3fb1950)

Features

• (errors) Integrate miette for enhanced diagnostic reporting (#10241) (156c3b1)

• (es/codegen) Support sourceMap.url option of terser (#10346) (566bc7c)

• (plugin/runner) Support pluginEnvVars (#10318) (795fedc)

Miscellaneous Tasks

• (es/helpers) Update peer dependency version for @swc/helpers to >=0.5.17 (#10321) (ddbf3e1)

• (ide) Disable RA diagnostics (#10324) (fcf280f)

Performance

• (es/ast) Reduce redundant string comparison for Atoms (#10323) (3ce9d81)

• (es/jsx) Cache FileName for JSX pass (#9951) (#10322) (9852940)

• (es/parser) Remove redundant is_ascii calls (#10334) (e66b4d6)

• (es/parser) Remove ascii check for no-ascii (#10350) (4279b96)

Testing

• (es) Unignore tests and update node to 20 in exec tests (#10348) (eee73ce)

[1.11.18] - 2025-04-07

Bug Fixes

• (errors) Disable wrapping of text lines (#10314) (f6840ea)

• (es/codegen) Ensure proper Unicode escape handling for ES5 and below #10028 (#10309) (7f76fa3)

• (node) Fix worker_threads issue on glibc platform (#10306) (1d1ff9e)

Features

• (es/minifier) Optimize number to int (#10294) (6dcfa70)

• (es/minifier) Remove useless to number (#10308) (898f170)

• (ts/isolated-dts) Distinguish js value and ts type (#10316) (c480604)

Refactor

• (es/codegen) Split lib.rs into multiple files (#10304) (5a07a5d)

• (es/codegen) Refactor macro to inverse order (#10297) (78f907f)

Testing

• (es/minifier) Remove duplicate test (#10305) (a80dea8)

[1.11.16] - 2025-04-01

Miscellaneous Tasks

• (deps) Update actions (#10222) (cf33196)

[1.11.15] - 2025-04-01

Bug Fixes

• (bindings/node) Fix build on platforms without plugin (#10301) (3faae55)

• (cli) Fix plugin target as wasm32-wasip1 (#10293) (7daf4f4)

• (deps) Update cargo (patch) (#10081) (e0ff00e)

• (es) Do not reuse Compiler for minify() and transform() (#10273) (63bd8a1)

• (es/analysis) Support comments (#10299) (2919d16)

• (es/bugfix) Do not rename in non-ident-function (#10274) (48b6bdb)

• (es/minifier) Remove unnecessary check when invoke IIFE (#10257) (6b75775)

• (es/parser) Parser a program as a module with TLA in non-expression statement (#10287) (157c52a)

• (html) Remove async from minifyFragmentSync (#10289) (7028457)

Documentation

• (es/types) Document outFileExtension (#10265) (99018c5)

• Add star history to README.md (b51eea9)

Features

• (es) Add Rust plugin host part for analysis API (#10285) (d213a84)

• (es) Add analysis API and refactor output API (#10288) (a53c60d)

• (es/minifier) Allow disabling char frequency analysis (#10259) (50c62d1)

• (es/minifier) Merge expression with empty return (#10283) (c276a38)

• (es/minifier) Optimize code generated by optional chaining (#10292) (0d88041)

• (es/minifier) Support reduce_escaped_newline (#10232) (64fb286)

• (ts/fast-strip) Improve error message format (#10298) (29c4afb)

• Add parallel iterators (#10075) (3b775bf)

Miscellaneous Tasks

• (html) Fix typing (3ed8a7a)

Performance

• (es/minifier) Adjust parallelism threshold (#10260) (28cc6f6)

• (es/minifier) Process cons and alt of IfStmt in parallel (#10262) (ccb6eb8)

• (es/minifier) Move logic to the pure minifier (#10264) (7ecd807)

• (es/minifier) Use swc_par_iter instead of rayon (#10267) (78e37a1)

Refactor

• Extract par-core and par-iter (#10269) (0c63bda)

• Drop swc_fast_graph (#10268) (b23c8cb)

Testing

• (es/minifier) Update the terser passing test list (#10263) (1d91571)

[1.11.13] - 2025-03-24

Features

• (es/minifier) Merge alt's cons with cons (#10256) (589bcd7)

• (swc_core) Expose features of swc_parallel (#10258) (042f19f)

Performance

• (es/minifier) Merge expr_simplifier into pure optimizer (#10202) (9c9b0ba)

[1.11.12] - 2025-03-23

Bug Fixes

• (es/minifier) Make inline_globals noop by default (#10231) (b192dc8)

• (es/minifier) Fix access to GLOBALS in char freq compute (#10239) (6286663)

• (es/parser) Fix span of wrong await tokens (#10252) (5c28dc3)

• (es/types) Fix broken types (#10224) (540bdf8)

Documentation

• (es) Improve documentation (#10247) (549e38d)

Features

• (es/fast-lexer) Enhance identifier handling with Unicode support (#10226) (482b63a)

• (es/minifier) Invoke IIFE into block (#10220) (c9a6c23)

• (es/minifier) Remove needless blocks (#10234) (0817970)

• (swc_parallel) Introduce rayon mode (#10237) (3c2213c)

• (ts/fast-strip) Add start/end span information (#10251) (ab39a62)

• (ts/fast-strip) Improve error message snippet (#10253) (f4f426c)

• (ts/fast-strip) Remove line numbers (#10254) (40e216d)

Performance

• (es/minifier) Merge dead_branch_remover into pure optimizer (#10201) (6841523)

[1.11.11] - 2025-03-17

Bug Fixes

• (es/ast) Fix Typo in API (#10210) (8eb87ba)

• (es/minifier) Do not drop numbers incorrectly (#10211) (80ccd86)

• (es/minifier) Allow TypeScript nodes to fix styled-jsx (#10221) (9d87d4d)

Features

• (es/minifier) Default to the smallest size (#10218) (800f51a)

Miscellaneous Tasks

• (es/minifier) Make test.sh faster (#10209) (f28d96e)

Refactor

• (es/minifier) Move some deps to dev deps (#10216) (1dcdbbc)

Testing

• (es/minifier) Add full tests back (#10212) (e6c04b4)

• (es/minifier) Remove full tests with too large input (#10213) (99b590f)

[1.11.10] - 2025-03-17

Bug Fixes

• (es/proposal) Fix declarations for explicit-resource-management (#10198) (99ba555)

• (es/types) Add missing types for jsc.transform.react.refresh (#10206) (e71b000)

• (typescript) Skip the body of ArrowExpr in type usage analysis (#10187) (9aca205)

Documentation

• (es/minifier) Make minifier example utilize comments (#10195) (ec3ebe7)

Features

• (es/fast-parser) Implement the initial version (#10185) (44e7c39)

Miscellaneous Tasks

• (es/minifier) Fix lints & size.sh (#10191) (e862c32)

Performance

• (es/minifier) Do not repeat applying pure minifier on last (#10196) (e6b7cee)

Refactor

• (es/minifier) Remove code for infinite loop (#10194) (fcc6884)

Testing

• (es/minifier) Update test inputs (#10193) (97d8337)

• (es/minifier) Add a benchmark for real-world inputs (#10204) (97f2180)

• (es/minifier) Disable real-world benchmarks on CI (#10205) (c5f1cbe)

• (es/minifier) Test only sizes for large inputs (#10208) (bec3e3e)

[1.11.9] - 2025-03-12

Bug Fixes

• (es/compat) Hoist arguments in object method while lowering async functions (#10167) (e764df2)

• (es/minifier) Check array inline for indexed with dynamic key (#10184) (c2fe4bf)

Features

• (es/module) Support more import.meta properties (#10179) (11727a6)

• (ts/fast-strip) Throw js object instead of map (#10186) (2da0142)

Performance

• (es/fast-lexer) Optimize read_identifier (#10170) (d97f7b2)

• (es/fast-lexer) Use memchr for skip_line_comments (#10173) (35194e3)

• (es/fast-lexer) Use SIMD properly for string literals (#10172) (be60338)

• (es/fast-lexer) Add length-based fast path for keywords (#10176) (1f70af8)

• (es/fast-lexer) Optimize memory layout of cursor (#10175) (aa20494)

• (es/fast-lexer) Remove bound checks (#10174) (bccdafc)

• (es/fast-lexer) Replace PHF with static keyword lookup table (#10181) (56d065e)

• (es/fast-lexer) Optimize SIMD vector initialization with initialing u8x16 once. (#10183) (435197c)

[1.11.8] - 2025-03-07

Bug Fixes

• (es/fast-lexer) Fix lexing of numeric literals (#10153) (65d23fe)

• (es/parser) Rescan << in new expression (#10159) (35bd6d9)

Features

• (ts/fast-strip) Throw an object instead of string (#10162) (241b881)

Performance

• (es/fast-lexer) Optimize lexing of keywords (#10155) (fb610b0)

• (es/fast-lexer) Optimize bound checks (#10157) (d74360e)

• (es/fast-lexer) Make whitespace skipper use SIMD properly (#10158) (15ea059)

• (es/lexer) Optimize whitespace scanning (#10136) (8a59753)

• (es/lexer) Optimize comment scanning (#10137) (9676c9a)

Refactor

• (es/lexer) Add fast lexer implementation (#10145) (b993f86)

• Drop unused crates (#10151) (58e4279)

• Drop unused js interop bindings (#10161) (0ceefaf)

Ci

• Add swc_plugins test to ecosystem CI (#10164) (b23d133)

[1.11.7] - 2025-03-04

Features

• (ts/fast-strip) Emit json errors (#10144) (740bd57)

[1.11.6] - 2025-03-04

Bug Fixes

• (es/minifier) Fix regression due to #10056 (#10134) (b145275)

• (es/typescript) Remove empty statements that const enum decls are folded into (#10128) (7bea830)

[1.11.5] - 2025-02-28

Bug Fixes

• (es/lints) Capture errors and emit from the original thread (#10119) (2304cd8)

• (es/minifier) Skip inlining if the referential identity of a function matters (#10123) (c08fe8d)

• (ts/fast-strip) Throw object consistently (#10122) (010ff2a)

Miscellaneous Tasks

• (deps) Update dependency base64 to v0.22.1 (#10124) (edea2c5)

Performance

• (es/resolver) Remove needless allocations (#10120) (f019d53)

[1.11.4] - 2025-02-27

Bug Fixes

• (es/decorators) Support negative numbers (#10114) (5044580)

• (es/minifier) Fix cargo feature debug (#10090) (48f68db)

• (es/minifier) Fix insufficient logging (#10091) (9ee79c9)

• (es/minifier) Inline before cost analysis (#10092) (1425b56)

• (es/minifier) Remove needless println (b1e5b2d)

• (es/resolver) Analyze variable declarations with declare (#10102) (cff6a64)

• (swc_malloc) Fix build issue due to malloc, really (#10117) (207a13f)

• (swc_malloc) Add target_env = "gnu" check (#10118) (da81e11)

• Use jemalloc on platforms that mimalloc fails to build (#10116) (fb75b98)

Miscellaneous Tasks

• (deps) Update dependency jsonc-parser to v0.26.2 (#10112) (8c5f7ef)

Performance

• (es/minifier) Improve arrow function inlining cost analysis (#10093) (e74929c)

• (es/resolver) Remove some vector allocations (#10101) (b65387a)

• Use mimalloc on linux (#10113) (3334932)

Refactor

• (es/react) Remove Lrc from parse_expr_for_jsx (#10098) (bab7704)

[1.11.1] - 2025-02-25

Bug Fixes

• (error-reporters) Store diagnostics in TransformOutput (#10027) (52caf23)

• (es/loader) Fix the absolute path check when resolving modules (#10080) (a3894ae)

• (es/minifier) Fix the order of match arms to inline correctly (#10053) (f0f842d)

• (es/types) Add transform.verbatimModuleSyntax (#10079) (a883cdc)

• (swc_common) Fix build with swc_allocator/nightly (#10067) (6a90b1f)

Documentation

• (swc_core) Add ChangeLog for swc_core (#10072) (608bc69)

Features

• (es/ast) Add explicit namespace field to distinguish namespace and module declarations (#10023) (76c2cba)

• (es/ast) Add import attributes to TsImportType (#9796) (7d297be)

• (es/minifier) Inline across side-effect-free member exprs, (#10056) (19d01d7)

• (es/minifier) Make seq inliner inline into var without init (#10077) (c4a839b)

• (es/visit) Introduce core-only visitors (#10049) (bc666be)

• (swc_allocator) Provide allocators (#10061) (d4362f7)

Miscellaneous Tasks

• (deps) Update dependency swc-plugin-coverage-instrument to ^0.0.26 (#10051) (d3fbd21)

• (swc_allocator) Remove nightly from default feature (#10058) (e78b9d1)

• (swc_allocator) Add #[inline] to allocator methods (#10066) (853eb53)

Performance

• (es/lints) Remove needless locks (#10086) (43458e9)

• (es/minifier) Prevent double boxing (#10074) (29bd286)

Refactor

• (atoms) Rename FastAtom to UnsafeAtom (#10070) (1771222)

• (atoms) Remove JsWord alias (#10071) (f33b0bc)

• (es/minifier) Remove CompileUnit to simplify (#10055) (c75578b)

[1.10.18] - 2025-02-19

Bug Fixes

• (hstr) Prevent memory leak for global stores (#10047) (4718bc0)

Miscellaneous Tasks

• (es/minifier) Make minify-all example ignore parsing errors (#10045) (6c7ec46)

Build

• (es) Select optimization level for each crates (#10046) (c28d494)

[1.10.17] - 2025-02-18

Bug Fixes

• (deps) Update cargo (patch) (#10021) (ffb7734)

• (typescript) Improve type inferring for undefined and null (#10038) (5059ece)

• (typescript) Remove the usages of private members (#10037) (8410b59)

Performance

• (hstr) Use thin arc for hash and length (#10033) (2bea793)

• (hstr) Skip interning if the text is long enough (#10035) (2622e4e)

Testing

• (hstr) Add tests (#10043) (32b58f0)

• (ts/fast-strip) Add tests for declare module error cases (#10040) (37672e0)

[1.10.16] - 2025-02-13

Bug Fixes

• (es/minifier) Check assign target before merge assign cond (#10020) (6dab49a)

• (es/parser) Preserve comment positions with leading semicolon (#10019) (c9937b6)

• (swc_common) Fix panic with non-narrow chars with width != 2 (#10011) (f9f4cac)

• (ts/fast-strip) Handle unsupported module keyword (#10022) (308f5d0)

Performance

• (es/codegen) Reduce allocation using compact_str (#10008) (7d7319f)

[1.10.15] - 2025-02-08

Bug Fixes

• (es/fixer) Wrap object tagged templates (#9991) (963c3a5)

• (es/minifier) Dont't optimize swtich case before DCE (#9994) (afe21b5)

• (es/minifier) Revert #10006 (#10007) (7e21323)

• (es/parser, es/codegen) Handle trailing empty slots in array patterns (#9992) (1a87e76)

• (es/react) Avoid adding __self in constructors of derived class in the jsx_self (#9987) (83f24af)

Features

• (es/ast) Add ShrinkToFit implementation (#10009) (6849b6a)

• (es/helpers) Update package exports for module-sync and webpack compatibility (#9995) (6f4e7ad)

• (fast-ts) Support Uint8Array Input (#9879) (61ae579)

Performance

• (es/codegen) Remove needless allocations (#9978) (9c89d57)

• (es/minifier) Do not clone from take_ident_of_pat_if_unused (#10005) (dc3b46e)

• (es/minifier) Allocate in once from mark_property_mutation (#10004) (4a90e51)

• (es/minifier) Limit infection analysis by the entry size (#10006) (1a3a4b9)

• (es/minifier) Make the default pass 2 (#10014) (07dc423)

[1.10.14] - 2025-02-03

Bug Fixes

• (deps) Update cargo (patch) (#9971) (e9843d8)

• (es/transforms) Pass unresolved_mark to simplifier instead of top_level_mark (#9989) (963b088)

Features

• (ts/fast-strip) Support type-only/uninstantiated namespaces (#9983) (a72c6fa)

Performance

• Update rustc-hash to v2 and drop ahash (#9982) (6765db0)