@swc/core

Bug Fixes

• (binding/node) Return an error when a file cannot be read instead of panicking (#12379) (d342acd)

• (bindings) Detect macOS ACLs with supported APIs (#12391) (a73ea68)

• (es) Decode template raw values when cooked is missing (#12347) (7898152)

• (es/codegen) Minify unicode escapes in template literals (#12284) (76ef91c)

• (es/codegen) Separate generic type assertion openers (#12340) (8948dac)

• (es/compat) Preserve array rest when lowering nested object rest (#12352) (9348083)

• (es/lexer) Stop iteration when input is exhausted (#12388) (c392686)

• (es/minifier) Check eval and arguments usage in var define scope (#12174) (5d1aa16)

• (es/minifier) Drop unused object pattern defaults (#12176) (76ac4bd)

• (es/minifier) Preserve Array spread arity (#12237) (cfbef85)

• (es/minifier) Preserve holes in array joins (#12242) (7eca515)

• (es/minifier) Preserve catch return before finally (#12232) (191b951)

• (es/minifier) Skip prototype setters in Object.keys (#12249) (8953ee3)

• (es/minifier) Guard static helper evaluation (#12247) (f154b61)

• (es/minifier) Preserve string import names (#12245) (b23c5ed)

• (es/minifier) Preserve unsigned shift coercion (#12260) (e0f3f4e)

• (es/minifier) Fold missing codePointAt to undefined (#12230) (052592a)

• (es/minifier) Fold local deletes to false (#12231) (dcbcf93)

• (es/minifier) Preserve Function.length arity (#12251) (753db8c)

• (es/minifier) Preserve rest RegExp identity (#12238) (4a73df1)

• (es/minifier) Preserve lexical method defaults (#12239) (7446da9)

• (es/minifier) Preserve arguments after IIFE spreads (#12243) (924d225)

• (es/minifier) Preserve string method arguments (#12234) (0d377f1)

• (es/minifier) Preserve optional-chain continuation throws (#12261) (c5f381b)

• (es/minifier) Preserve constant switch test effects (#12252) (ca1f943)

• (es/minifier) Preserve shadowed undefined yield values (#12272) (00da5c1)

• (es/minifier) Retain unsafe Symbol call arguments (#12248) (2611085)

• (es/minifier) Guard similar if merges (#12262) (e608832)

• (es/minifier) Preserve conditional assignment target order (#12253) (5d703f0)

• (es/minifier) Preserve Set and Map iteration (#12254) (c28b95f)

• (es/minifier) Preserve sequence IIFE argument evaluation (#12258) (c8eec79)

• (es/minifier) Respect global defs root bindings (#12266) (107af6a)

• (es/minifier) Format toExponential compatibly (#12257) (62d8b28)

• (es/minifier) Preserve tiny toPrecision calls (#12246) (d64acad)

• (es/minifier) Preserve async IIFE return values (#12269) (3119b07)

• (es/minifier) Retain rest params in dynamic scopes (#12264) (e222efd)

• (es/minifier) Safely hoist property callees (#12183) (df3f7ab)

• (es/minifier) Preserve catch assignments before finally (#12259) (7a2ca6e)

• (es/minifier) Preserve delete operand effects (#12244) (d8631aa)

• (es/minifier) Preserve unary comparison evaluation order (#12275) (440fd7f)

• (es/minifier) Preserve branches when collapsing assignments (#12280) (0239111)

• (es/minifier) Preserve empty array assignments (#12250) (20e9c5f)

• (es/minifier) Preserve empty IIFE parameter effects (#12268) (c8a2657)

• (es/minifier) Preserve empty join coercion (#12240) (a5bd592)

• (es/minifier) Preserve empty object destructuring errors (#12276) (246e615)

• (es/minifier) Deduplicate folded Object.keys (#12263) (c652537)

• (es/minifier) Preserve finalizer breaks in switches (#12330) (1156952)

• (es/minifier) Preserve strict equality for repeated calls (#12320) (2755d73)

• (es/minifier) Preserve class scope in if-return negation (#12319) (f568ff2)

• (es/minifier) Preserve function expression names (#12318) (9ee8686)

• (es/minifier) Preserve finalizer completions (#12325) (eddbd18)

• (es/minifier) Evaluate String.raw templates with raw quasis (#12322) (5f49135)

• (es/minifier) Preserve returns in finalizers (#12324) (f7894f5)

• (es/minifier) Scan all adjacent hoist declaration pairs (#12335) (c3e2d35)

• (es/minifier) Preserve reassigned arguments access (#12235) (5f02d02)

• (es/minifier) Preserve switch fallthrough cases (#12328) (fe41cd5)

• (es/minifier) Preserve lone surrogate template values (#12329) (ff90d49)

• (es/minifier) Preserve spread iteration in unused builtins (#12334) (90d449d)

• (es/minifier) Preserve computed update targets (#12326) (22518fc)

• (es/minifier) Check class side effect (#12336) (397e0b6)

• (es/minifier) Preserve let initialization when dropping unused variables (#12345) (2ea13bf)

• (es/minifier) Do not merge sequences across array spreads (#12375) (f145dfe)

• (es/minifier) Preserve destructuring patterns with PURE-annotated initializers (#12386) (6ee2384)

• (es/minifier) Mark properties assigned through destructuring targets as mutated (#12398) (42e4f7e)

• (es/minifier) Keep function and class declarations whose self-reference is dropped (#12401) (cd25b14)

• (es/minifier) Avoid inline arrow with this when used as arg (#12409) (9de48a0)

• (es/parser) Reject unicode escapes in RegExp flags (#12093) (4f98673)

• (es/parser) Allow line breaks before enum names (#12341) (c594a7c)

• (es/parser) Allow ambient rest trailing commas (#12342) (9362f19)

• (es/parser) Respect line breaks after declare (#12353) (fe1dfad)

• (es/parser) Parse optional generator methods (#12355) (0b33a30)

• (es/parser) Allow line breaks before import attributes (#12356) (6684de3)

• (es/parser) Allow await identifiers in explicit Script parsing (#12364) (a2db32d)

• (es/parser) Respect line breaks before definite assignment assertions (#12362) (505766f)

• (es/parser) Restore strict context after classes (#12361) (0cb1a67)

• (es/parser) Reset static block context for nested declarations (#12360) (e3a33ab)

• (es/parser) Allow eval and arguments in ambient function declarations (#12359) (21b0cba)

• (es/parser) Parse static constructor methods in JavaScript (#12357) (98f718f)

• (es/parser) Allow of bindings in await using loops (#12354) (c7f40bb)

• (es/parser) Accept valid declare readonly field initializers (#12363) (3668176)

• (es/parser) Preserve elisions in arrow binding patterns (#12366) (3b3689a)

• (es/parser) Isolate constructor function contexts (#12367) (7954b2d)

• (es/parser) Correctly round non-decimal numeric literals (#12370) (7636d01)

• (es/parser) Allow string import and export names after type (#12371) (baf0ba6)

• (es/parser) Preserve type references named asserts before line breaks (#12372) (1f12e7f)

• (es/parser) Recognize named optional and rest tuple elements (#12368) (476ba33)

• (es/parser) Support leading pipes in Flow match patterns (#12393) (3c381f4)

• (es/parser) Allow escaped keywords as property names (#12358) (478aaee)

• (es/parser) Parse optional renamed Flow component parameters (#12410) (1dea7a6)

• (es/typescript) Fold optional-chained enum member reads (#12179) (4519330)

• (hstr) Avoid panic in Wtf8::starts_with (#12383) (3ae4e24)

• (html/minifier) Preserve adjacent script elements (#12411) (aea189d)

• (html/parser) Preserve customizable select markup (#12413) (86d40bd)

• (node) Repair native release verification and cache handling (#12415) (2b292c8)

• (nodejs) Complete Amaro REPL support APIs (#12395) (4b42cd5)

• Use Rust changeset package names (#12283) (7241d4b)

• Correct quoted package name in changeset (#12387) (55ffd3e)

Documentation

• (agents) Document terser fixture backlog workflow (#12274) (07328de)

• (es/minifier) Clarify decorator input and test boundaries (#12337) (d8b76cc)

• (es/minifier) Clarify semantic preservation policy (#12349) (ff6a3c3)

Features

• (bindings) Add private compressed native addon foundation (#12289) (2855b5a)

• (bindings) Gate native npm releases on verified carriers (#12292) (556044f)

• (es/minifier) Honor /*#__PURE__*/ on property reads and destructuring patterns (#12384) (43f4fdb)

• (es/minifier) Account for shorthand expansion when inlining (#12428) (bd4c573)

• (es/module) Support moduleRoot for AMD module IDs (#11964) (4b4c135)

Miscellaneous Tasks

• (deps) Eliminate unnecessary dependencies (#12377) (f517d5a)

• (es/ast) Fix typo (#12376) (96c0927)

Performance

• (es/preset-env) Reduce binary size with browserslist deflate (#12381) (81e0d7d)

• (es/transforms) Skip script traversal in export-default-from (#12348) (f37ce70)

• (swc_core) Deduplicate ICU dependencies (#12385) (53cb564)

Refactor

• (es/minifier) Simplify constant-false loop guards (#12293) (a37d439)

• (es/minifier) Remove useless helper (#12286) (b83aa6a)

• (es/minifier) Remove useless helpers (#12343) (14bfa36)

• (es/minifier) Dead code (#12392) (bbdc059)

Testing

• (es/transforms) Remove export-default-from benchmark (#12350) (5a2096f)

Mod

• (es/minifier) Check Map/Set param is array (#12287) (d602f58)

Revert

• (es/minifier) Revert #12384 (#12419) (763cc20)

Bug Fixes

• (es/compat) Preserve for-of var binding scope (#12158) (f6d5bd1)

• (es/decorators) Drop params from getter replacing decorated private method (#12161) (d56f594)

• (es/flow) Preserve Flow component type semantics (#12090) (c8d5b49)

• (es/minifier) Mark for update and test as executed multiple time (#12131) (1260e36)

• (es/minifier) Report for loop var decl as assign (#12136) (783bbc2)

• (es/minifier) Don't replace value-used console.*.bind() calls with undefined (#12138) (ed74223)

• (es/minifier) Drop spans of cached globals values (#12129) (9a306b8)

• (es/minifier) Preserve effects of returned value calls (#12140) (c37b5a9)

• (es/minifier) Avoid JSX sequence inlining loop (#12149) (4e79b94)

• (es/minifier) Preserve bindings in copied inline arrows (#12141) (cf7b5c9)

• (es/minifier) Preserve do-while control-flow targets (#12160) (f62c437)

• (es/minifier) Preserve pure annotation ownership (#12180) (ec780f9)

• (es/parser) Retry ambiguous Program parsing (#12142) (141a320)

• (es/parser) Preserve await grammar boundaries (#12156) (c732683)

• (es/quote) Restore await parsing (#12163) (918f517)

• (es/typescript) Treat const variable references as enum constants (#12101) (c523551)

• (swc) Key optimizer env cache by configured values (#12166) (c0b6f12)

• (visit) Panic on invalid AST paths (#12154) (b4d11a9)

Features

• (es/minifier) Evaluate Math.floor, Math.ceil, Math.round and Mat… (#12117) (e876e80)

• (es/parser) Add opt-in parser-only TSRX lowering (#12120) (61ff097)

Miscellaneous Tasks

• (deps) Upgrade reqwest to 0.12 (#12144) (8dd98e4)

• (deps) Ignore unpatched Wasmtime advisory (#12170) (5dd7422)

Refactor

• (react-compiler) Use official packages (#12168) (6d34fe7)

Testing

• (es/minifier) Update test fixtures (#12135) (2f3e88d)

Ci

• Only plan completed issues and merged PRs (#12133) (4d9aa8e)

• Gate jobs with detected changes (#12147) (3802924)

• Tag published misc npm packages (#12173) (a789691)

Bug Fixes

• (es/minifier) Preserve for init (#12121) (0a1d4de)

• (es/modules) Preserve destructuring assignment targets in SystemJS (#12122) (557060b)

• (es/react) Handle apos JSX entities (#12125) (d09547f)

Bug Fixes

• (encoding) Fix incorrect fields count (#11905) (6fb4ca1)

  • BREAKING: Fix incorrect fields count (#11905)

• (es/ast) Prevent mutable reference escape (#12088) (592f559)

• (es/ast) Fix panic on JSX surrogate entities (#11803) (d21de47)

  • BREAKING: fix panic on JSX surrogate entities (#11803)

• (es/es2015) Preserve this in static field parameters (#12085) (5b758ed)

• (es/minifier) Remove unused variable initializer cycles (#12106) (0421534)

• (es/minifier) Bound arguments parameter injection (#12053) (46d6f41)

• (es/preset-env) Lower unsupported async generators (#12086) (3a144b1)

• (hstr) Avoid references to uninitialized bytes (#12087) (68f0983)

• (plugin) Make raw byte reconstruction unsafe (#12089) (83ab4ed)

• (plugin/runner) Write Wasmer cache atomically (#12100) (3c4f404)

• (react-compiler) Make fast check conservative (#12105) (7e14950)

• (react-compiler) Preserve TypeScript function overload signatures (#12115) (a132384)

Miscellaneous Tasks

• (deps) Update browserslist-rs to 0.20 (#12098) (b395eab)

• (deps) Update lru to 0.18.2 to fix cargo deny (#12116) (c9d1da4)

Refactor

• (es/ast) Add body_ctxt to Switch (#12065) (bf25ae0)

  • BREAKING: Add body_ctxt to Switch (#12065)

• (es/ast) Split TypeScript this parameters (#12075) (1687c0f)

  • BREAKING: split TypeScript this parameters (#12075)

• (es/ast) Use Function for object accessors (#12077) (9ae902e)

  • BREAKING: use Function for object accessors (#12077)

• (es/ast) Introduce FunctionBody (#12096) (394c7c9)

  • BREAKING: introduce FunctionBody (#12096)

Bug Fixes

• (es) Preserve numeric property key identity (#12050) (46900a3)

• (es/ast) Support hashing non-finite numbers (#12043) (f4b85a6)

• (es/codegen) Emit non-finite numeric literals (#12047) (883abc4)

• (es/decorators) Avoid class state leakage for nested undecorated classes (#12076) (4c9d277)

• (es/minifier) Apply ToInt32 when folding bitwise NOT (#12058) (550e2f7)

• (es/minifier) Avoid inexact number radix folding (#12057) (506a0ea)

• (es/minifier) Preserve invalid Array lengths (#12056) (3ce9e16)

• (es/minifier) Preserve non-canonical arguments access (#12052) (850230b)

• (es/minifier) Apply ToUint16 in fromCharCode (#12055) (9ae7b92)

• (es/minifier) Index strings by UTF-16 code unit (#12054) (bc263d2)

• (es/minifier) Use numeric literals for non-finite values (#12048) (b830786)

• (es/minifier) Preserve top-level declarations referenced only by direct eval (#12029) (ad0e3b4)

• (es/optimization) Preserve JSON numeric values (#12051) (667af8c)

• (es/transforms) Use numeric literals for non-finite enum values (#12049) (1e3ed5c)

• (es/typescript) Evaluate cooked enum templates (#12059) (49d0b0f)

• (html/minifier) Preserve JSON script boundaries (#12080) (e1877b4)

• (testing) Check ignored fixtures relative to crate root (#12073) (da858b4)

• (ts/fast-strip) Preserve ASI before interpolated templates (#12040) (54467fe)

• (ts/fast-strip) Preserve UTF-16 source positions (#12067) (ac4bfc9)

Features

• (es/minifier) Expand support for trivial spreads (#12068) (aa49e36)

• (es/react-compiler) Expose reactCompiler.environment.enableFunctionOutlining (#12030) (52b78aa)

Performance

• (es/renamer) Skip identity rename mappings on apply (#12041) (0f9ff15)

Bug Fixes

• (deps) Update crossbeam-epoch to 0.9.20 (#12004) (fababa1)

• (es/fixer) Normalize for-head ident patterns (#11968) (af681bc)

• (es/fixer) Preserve parens around PURE-annotated receivers (#12022) (73d8941)

• (es/hygiene) Ignore eval in default hygiene pass (#12003) (dd43ad6)

• (es/minifier) Eliminate unused classes with cyclic references (#11963) (63a94b9)

• (es/minifier) Preserve switch fallthrough termination (#11971) (a5d19ae)

• (es/minifier) Check last case (#11972) (060c7ac)

• (es/minifier) Disable IIFE invoke when there's eval (#11984) (eabe4be)

• (es/minifier) Invoke IIFE when has eval (#11987) (457df11)

• (es/minifier) Make Infect Collect collect every used ident (#11998) (fb9ebee)

• (es/minifier) Measure number length precisely (#12026) (54d139a)

• (es/module) Rewrite .tsx imports to .js unless JSX is preserved (#11995) (c341d9c)

• (es/module) Rewrite SystemJS transform (#11996) (2f47530)

• (es/modules) Resolve relative symlinked inputs from cwd (#11883) (01e857d)

• (es/react) Emit jsxdev source for fragments (#11993) (a70ce24)

• (es/react-compiler) Correct catch and parameter scope resolution (#11985) (3867e57)

• (react-compiler) Remove React-like prefilter (#12007) (ab66869)

• (ts/fast-strip) Handle generic arrow line breaks (#12034) (3d82701)

Documentation

• (agents) Document minifier assumptions (#11966) (58df612)

Features

• (bindings) Add lint / lintSync API to @swc/react-compiler (#11965) (ab4ce67)

• (es/minifier) Remove unused param for new Function or Class Expr (#12017) (be56e09)

• (es/minifier) Remove unused param for new expr (#12027) (661067c)

• (wasm) Add @swc/nodejs-support-wasm (#11975) (b617562)

Refactor

• (es/helpers) Generate inline helpers from canonical ESM sources (#12006) (f36e4b6)

• (es/helpers) Remove unused jsx helper (#12009) (ccbc906)

• (es/lexer) Remove smartstring dependency (#12013) (d6833cc)

• (es/minifier) Remove ProgramData.top (#12031) (a72571f)

• (es/module) Align module transform records with spec terms (#11992) (f680df5)

• (es/module) Introduce source module lowering pipeline (#11999) (9609b7f)

• Remove direct rkyv dependencies (#12010) (5761a2b)

Testing

• (react-compiler) Add build-pass fixtures for wrapped assignment targets (#11967) (58d9b53)

Build

• Remove vergen dependency (#11976) (26d8a28)

Ci

• Allow publish milestone PR updates (#11960) (885d3e2)

• Allow memmap2 advisory (#11961) (0be5872)

• Update rust-toolchain action pin (#12021) (78b41b5)

• Use Node.js 24 by default (#12035) (d658d08)

• Update rust-toolchain action pin (#12036) (d1a1e23)

• Use Node.js 24 for wasm publishing (#12038) (516bf3c)

Bug Fixes

• (es/es2022) Correct scope for private property brand checks (#11953) (fb5afa2)

• (es/minifier) Preserve cooked when concatenating template literals (#11939) (a7244a6)

• (es/minifier) Gate Number(x) -> +x on unsafe flag (#11944) (#11949) (6176019)

• (es/parser) Parse Flow bare renders types (#11929) (a71c8eb)

• (es/parser) Allow no-default builds (#11956) (baab240)

• (es/react-compiler) Skip TypeScript this pseudo-params in scope collector (#11940) (9066c43)

• (es/react-compiler) Scope ClassStaticBlock and TsModuleBlock as var boundaries (#11943) (1ee74a0)

• (react-compiler) Avoid reporting non-fatal success errors as diagnostics (#11951) (cb4cb23)

• (react-compiler) React compiler AST conversion for wrapped assignment targets (#11952) (fc9b453)

• (react-compiler) Disable parser default features (#11957) (75ddb28)

Documentation

• Document untrusted input security scope (#11937) (677305b)

Features

• (es/react-compiler) Add React Compiler (#11917) (b182fbd)

• (swc) Gate react compiler re-export (#11941) (dcc0f2d)

Miscellaneous Tasks

• (es/react-compiler) Update forked react compiler to 0.2.0 (#11946) (6fbe188)

Refactor

• (es/react-compiler) Preserve TS metadata during AST roundtrip (#11950) (9c4dec3)

• Remove production tracing hooks (#11945) (0dffdc4)

Bug Fixes

• (bindings/node) Preserve source context for AST transforms (#11920) (b6dfa74)

• (es/codegen) Emit export as namespace correctly (#11923) (4e1f832)

• (es/codegen) Emit export as namespace minified correctly (#11924) (7157499)

• (es/compat) Rewrite this in destructuring defaults (#11909) (68af779)

• (es/decorators) Delay 2022 decorator initializers after private fields (#11847) (3f1a4f5)

• (es/decorators) Handle import types in decorator metadata (#11916) (f411429)

• (es/fixer) Preserve new tagged template callee parens (#11922) (242a03a)

• (es/minifier) Handle unknown member props (#11927) (e59ba68)

• (es/parser) Handle Flow async generic arrows (#11926) (b9b8993)

• (es/renamer) Avoid duplicate mangled names across eval scope boundaries (#11913) (4a1af84)

• (plugin) Avoid importing __free from env (#11908) (4584296)

• (swc) Preserve plugin error context (#11904) (4e2e9fc)

• (swc_common) Fix sourcemap panic for multibyte mapping positions (#11918) (40c1601)

Documentation

• Fix architecture fixer link (#11911) (51cbc8c)

Performance

• Lazily compute source file hashes (#11879) (a3cfbd7)

• Optimize Atom equality (#11902) (c6f8cb0)

Revert

• (es/decorators) Revert decorator initializer ordering (#11901) (a3f23b1)

• (swc_common) Revert sourcemap multibyte mapping clamp (#11919) (08b4200)

Bug Fixes

• (es/minifier) Preserve args for destructured callbacks (#11830) (21873b0)

• (es/minifier) Avoid generating mangled property names that collide with existing properties (#11839) (9b4fab5)

• (es/minifier) Respect ecma for iife temp vars (#11873) (e481934)

• (es/minifier) Preserve default parameter object props (#11884) (71ff84f)

• (es/parser) Reject object-rest assignment to array/object literal (#11875) (7b57d1f)

• (es/parser) Reject object rest assignment to literals (#11881) (4ec2eaf)

• (es/react) Exclude self-recursive hooks from refresh dependency array (#11838) (9101c71)

• (ts/fast-dts) Strip definite assertions in dts (#11858) (2ab1b8a)

• (ts/fast-strip) Reject unsafe assertion erasure in binary expressions (#11828) (aa5b539)

• (typescript) Strip parameter binding defaults in dts (#11857) (800bc17)

Documentation

• Update agent guidance (#11842) (bf2d015)

• Add security policy (#11876) (6c43c2d)

• Clarify security scope for npm packages (#11877) (4662db8)

• Clarify untrusted input security model (#11882) (5463777)

Features

• (es/minifier) Fine grained effect analysis of class (#11814) (c9058ad)

• (swc_cli) Implement all features for swc_cli (#11797) (9300ede)

Miscellaneous Tasks

• (es/minifier) Fix typo in debug log (#11866) (3de0254)

• (html) Add webcontainer fallback for @swc/html (#11860) (7692eed)

Performance

• (ecma) Reduce transformer compat overhead (#11856) (d03cb71)

• (es/codegen) Speed up JsWriter position and srcmap tracking (#11867) (dbceade)

• (es/codegen) Remove JsWriter last_srcmap cache (#11869) (3bc1c2b)

• (es/minifier) Reduce minifier profiling hotspots (#11853) (28c1091)

• Optimize es parser comment finalization (#11852) (2959ddf)

Testing

• (es/minifier) Move issue_11835 fixture out of terser folder (#11840) (3dd3431)

Ci

• Update corepack in publish docker jobs (#11885) (9a7d954)

• Pass publish docker env explicitly (#11888) (c5f7547)

• Lock issues closed by merged prs (#11887) (6bd74e5)

• Provide aarch64 musl linker in publish job (#11889) (20234fd)

• Fix publish musl linker and windows tests (#11890) (a798a23)

• Make minifier test path explicit (#11891) (e7cba97)

Security

• Save CI caches only on main (#11848) (7582529)

• Update rkyv and Rust dependencies (#11851) (20d92eb)

• Harden PR workflow permissions (#11849) (e199564)

Bug Fixes

• (ci) Update rand lockfile entries (#11827) (7988966)

• (es/minifier) Fold unary bool nullish coalescing (#11826) (e39ae3d)

• (es/minifier) Preserve for-init sequence order (#11837) (16a56d0)

• (es/parser) Parse empty Flow exact object type (#11836) (3d18a26)

Features

• Move swc ast explorer into workspace (#11831) (02a8f81)

Bug Fixes

• (es/flow) Fix Flow type-only modules in script transforms (#11817) (be38316)

• (es/flow) Avoid restoring module context when flow syntax is enabled (#11819) (3ed7243)

• (es/minifier) Preserve frozen spread registry keys (#11825) (347181c)

• (es/parser) Align Flow generic arrow JSX disambiguation (#11821) (28a7fad)

Features

• (es) Add jsc.preserveSymlinks to swc::Options (#11813) (fe38342)

Bug Fixes

• (deploy) Fix musl binding test workflow (#11804) (c30a522)

• (deploy) Build package ts before Linux GNU binding tests (#11806) (a3d3ef3)

• (es/jsx) Preserve quoted JSX attribute newlines (#11796) (9fe56c8)

• (es/minifier) Support full ES version parsing in minify (#11800) (af1f08f)

• (es/module) Add opt-in symlink-preserving resolver (#11801) (6028240)

• (es/parser) Allow return type annotation on Flow constructors (#11790) (d66b29c)

• (es/parser) Support Flow anonymous keyof indexers (#11792) (452c4e5)

• (es/parser) Add Flow strip RN and RNW regression corpus (#11799) (23a9109)

Documentation

• Require PR template for pull requests (#11793) (3a1084a)

Features

• (es/minify) Support extracting comments (#11798) (5986411)

Bug Fixes

• (es/decorators) Preserve super in moved static members (#11781) (778328e)

• (es/decorators) Scope moved static super rewrite (#11782) (f73cacc)

• (es/parser) Parse mixed Flow anonymous callable params (#11786) (05e7b69)

• (es/transforms) Rewrite class references in non-static members (#11772) (fff1426)

• (es/typescript) Handle TypeScript expressions in enum transformation (#11769) (85aa4a8)

Documentation

• Document Flow strip support (#11778) (8f176cc)

Features

• (swc_common) Add SourceMapper.map_raw_pos (#11777) (7d2e94c)

• (swc_config) Add Hash/Eq for options and CachedRegex (#11775) (86a4c38)

Performance

• (swc) Use larger input for es/full benchmarks (#11779) (4409920)

Refactor

• (es/minifier) Inline into shorthand prop early (#11766) (450bdfa)

Build

• Update rustc to nightly-2026-04-10 (#11783) (6facc79)

Bug Fixes

• (es/decorators) Scope 2023-11 implicit-global rewrite to decorator-lifted exprs (#11743) (1c01bbb)

• (es/minifier) Handle toExponential(undefined) (#11583) (cd94a31)

• (es/minifier) Cap deep if_return conditional chains (#11758) (a92fa3e)

• (es/minifier) Inline prop shorthand in computed props (#11760) (71feafb)

• (es/parser) Parse key Flow forms from #11729 (phase 1) (#11733) (886fe53)

• (es/parser) Close remaining Flow parser gaps for #11729 (phase 2) (#11740) (8d36f05)

• (es/regexp) Preserve source for wrapped named groups (#11757) (7e56fe5)

• (html/codegen) Keep </p> for span-parent paragraphs (#11756) (ede9950)

• (swc_common) Make eat_byte unsafe to prevent UTF-8 boundary violation (#11731) (669a659)

Features

• (es/minifier) Remove useless arguments for non inlined callee (#11645) (bab249e)

• (react-compiler) Advance SWC parity for upstream fixtures (#11724) (468da70)

• (react-compiler) Tighten core validation parity for upstream fixtures (#11734) (7e2cf8d)

• (react-compiler) Improve SWC parity for early-return and hooks validation (#11738) (4739c58)

• (react-compiler) M1 memo validators + lint gating alignment (#11739) (7e1ad26)

• (react-compiler) Improve Stage A diagnostic parity and validation aggregation (#11745) (0e2075e)

• (react-compiler) Continue swc parity for dependency handling (#11747) (83688c8)

Refactor

• (es/minifier) Inline usage analyzer and remove crate (#11750) (7d8d11b)

• (react-compiler) Remove compiler impl and keep fast_check (#11753) (f21d336)

Ci

• Add manual Publish crates workflow (#11763) (169c961)

• Add misc npm publish workflow (#11764) (236eff0)

Bug Fixes

• (cli) Honor externalHelpers=false in rust binary (#11693) (1be052e)

• (cli) Skip mkdir when --out-file targets the current directory (#11720) (f3f4e51)

• (es/decorators) Resolve 2022-03 issues #9565/#9078/#9079 and add regressions (#11698) (a025d2b)

• (es/fixer) Wrap new opt chain (#11618) (fdcd184)

• (es/flow) Normalize module await bindings for Hermes parity (#11703) (73d8761)

• (es/minifier) Fix compatibility for Wasm plugin (swc_ast_unknown) (#11641) (abd0e45)

• (es/module) Preserve explicit index.js import path when baseUrl is set (#11597) (830dbeb)

• (es/module) Avoid rewriting unknown relative extensions (#11713) (ed09218)

• (es/regexp) Implement transform-named-capturing-groups-regex (#11642) (f62bfa9)

• (es/types) Add new options types (#11683) (62eeee1)

• (malloc) Fallback to system allocator on linux gnu s390x/powerpc (#11606) (e103fac)

• Update lz4_flex to resolve RUSTSEC-2026-0041 (#11701) (7528507)

Documentation

• (agents) Improve guidance (#11626) (1cdfec9)

• (agents) Add AGENTS two-pass rules for es crates (#11634) (12af4a1)

• Move parser design guidance into AGENTS.md (#11600) (e6e91a3)

• Clarify workaround comment requirement in AGENTS (#11700) (e2ad6f6)

Features

• (bindings) Add linux ppc64le and s390x support across npm bindings (#11602) (357255d)

• (bindings) Enable flow strip support in @swc/core (#11696) (93da89a)

• (cli) Enable Flow strip support in swc_cli_impl (#11705) (0ea9950)

• (dbg-swc) Add flow strip verification command (#11706) (77b7854)

• (es) Add swc_es_codegen for swc_es_ast (#11628) (c282d86)

• (es) Add 2-pass transformer and minifier crates (#11632) (f70a4b7)

• (es) Add TypeScript + React transforms and tsc corpus tests (#11635) (09a5d8d)

• (es/helpers) Prevent recursive instanceof helper transforms (#11609) (cb755a3)

• (es/parser) Add with_capacity for Capturing (#11679) (60df582)

• (es/parser) Add flow syntax mode and strip integration (#11685) (015bbe8)

• (es/parser) Finish flow strip support for core syntax gaps (#11689) (584a12f)

• (es/parser) Extend flow declare export strip compatibility (#11691) (a8315aa)

• (es/parser) Support Flow declare export default interface strip path (#11692) (588577c)

• (es/parser) Add Hermes Flow parity harness and fixes (#11699) (918b6ac)

• (es/parser) Complete Hermes Flow stripping parity (#11702) (f041f4c)

• (es/proposal) Add decorators 2023-11 support (#11686) (e96eb6a)

• (es/react-compiler) Scaffold SWC port of Babel entrypoint (#11687) (4a1d3ce)

• (es/react-compiler) Phase1 crate API baseline and fixture harness (#11690) (31364dc)

• (es/react-compiler) Strict upstream parity finalization (crate-only, WIP) (#11697) (a3994aa)

• (es/react-compiler) Advance strict upstream parity (#11709) (9b3abe0)

• (es/react-compiler) Advance upstream fixture parity pipeline (#11716) (33fe6f2)

• (es/semantics) Add scope analysis and statement-level cfg (#11623) (86815b1)

• (es_parser) Complete parity suite with zero ignores (#11615) (ee3fdd5)

• (es_parser) Complete internal parser wiring without ecma runtime dep (#11622) (1c51891)

• (es_parser) Expand benchmark corpus (#11633) (ff3adef)

• (react-compiler) Advance SWC upstream fixture parity (#11718) (e8d1696)

• (react-compiler) Improve lint rename and gating parity (#11721) (5f89ee7)

• (swc_es_parser) Enforce full parity suite and extend grammar surface (#11611) (585f7d0)

• (swc_es_parser) Complete lossless modeling for with/TS module/decorators (#11613) (59b1189)

• (swc_es_parser) Close parity gaps with full core/large fixture pass-fail parity (#11614) (3085f52)

• Complete core parity parser coverage (#11603) (18e0edc)

Performance

• (es/modules) Avoid export sort key clones (#11669) (e74e17d)

• (es/parser) Reduce JSX identifier rescan allocations (#11671) (f9214fe)

• (es/parser) Optimize underscore stripping in numeric literal hot path (#11670) (874338b)

• (es/transformer) Remove O(n^2) statement mutation hotspots (#11672) (bdc24b7)

• (es_parser) Byte-search lexer optimization pass (#11616) (607f2db)

• (es_parser) Reduce lookahead and allocation overhead (#11673) (becd9b0)

• (ts/fast-strip) Avoid token capture in default transform path (#11668) (06aa0db)

Refactor

• (es/minifier) Use arguments data from scope (#11604) (4738539)

Testing

• (es/flow) Add flow strip corpus correctness test (#11694) (cd5ed81)

• (es/parser) Enforce full ecma fixture parity (#11637) (0bf8a46)

• (es/parser) Expand flow strip fixture coverage (#11695) (e231262)

• (es_parser) Add core snapshot suite (#11617) (23c56fe)

• (es_parser) De-arenaize ecma_reuse fixture snapshots (#11639) (aa6727a)

• (es_parser) Recover swc_es_parser benchmark coverage (#11640) (0f24ee1)

• Expand swc_es_parser snapshot suites (ecma-style) (#11621) (325170f)

• Move TS decorator fixtures out of proposal crate (#11723) (e29d58c)

Ci

• Bump cargo-mono to 0.5.0 (#11605) (7118713)

• Remove --no-verify flag from cargo mono publish (02eb5ec)

• Optimize cargo-test matrix with cargo mono changed (#11681) (99e61c4)

• Bump cargo-mono to 0.5.3 (#11722) (b5272af)

• Install zig for core ppc64le/s390x nightly cross builds (#11725) (09c4be0)

Bug Fixes

• (html/wasm) Publish @swc/html-wasm for nodejs (#11601) (bd443f5)

Documentation

• Add AGENTS note about next-gen ast (#11592) (80b4be8)

• Add typescript-eslint AST compatibility note (#11598) (c7bfebe)

Features

• (es/ast) Add runtime arena crate and bootstrap swc_es_ast (#11588) (7a06d96)

• (es/parser) Add swc_es_parser (#11593) (f11fd70)

Ci

• Triage main CI breakage (#11589) (075af57)

Documentation

• Add submodule update step before test runs (#11576) (81b22c3)

Features

• (bindings) Add html wasm binding and publish wiring (#11587) (b3869c3)

• (sourcemap) Support safe scopes round-trip metadata (#11581) (de2a348)

• Emit ECMA-426 source map scopes behind experimental flag (#11582) (2385a22)

Bug Fixes

• (errors) Avoid panic on invalid diagnostic spans (#11561) (b24b8e0)

• (es/helpers) Fix _object_without_properties crash on primitive values (#11571) (4f35904)

• (es/jsx) Preserve whitespace before HTML entities (#11521) (64be077)

• (es/minifier) Do not merge if statements with different local variable values (#11518) (3e63627)

• (es/minifier) Prevent convert_tpl_to_str when there's emoji under es5 (#11529) (ff6cf88)

• (es/minifier) Inline before merge if (#11526) (aa5a9ac)

• (es/minifier) Preserve array join("") nullish semantics (#11558) (d477f61)

• (es/minifier) Inline side-effect-free default params (#11564) (1babda7)

• (es/parser) Fix generic arrow function in TSX mode (#11549) (366a16b)

• (es/react) Preserve first-line leading whitespace with entities (#11568) (fc62617)

• (es/regexp) Transpile unicode property escapes in RegExp constructor (#11554) (476d544)

Documentation

• (agents) Clarify sandbox escalation for progress (#11574) (cb31d0d)

Features

• (es/minifier) Add unsafe_hoist_static_method_alias option (#11493) (6e7dbe2)

• (es/minifier) Remove unused args for IIFE (#11536) (3cc286b)

Refactor

• (es/parser) Compare token kind rather than strings (#11531) (5872ffa)

• (es/typescript) Run typescript transform in two passes (#11532) (b069558)

• (es/typescript) Precompute namespace import-equals usage in semantic pass (#11534) (b7e87c7)

Testing

• (es/minifier) Add execution tests for issue #11517 (#11530) (01b3b64)

• Disable cva ecosystem ci temporariliy (55bc966)

Ci

• Reset closed issue and PR milestone to Planned (#11559) (d5c4ebe)

• Add permission (431c576)

Bug Fixes

• (es/codegen) Emit leading comments for JSX elements, fragments, and empty expressions (#11488) (1520633)

• (es/decorators) Invoke addInitializer callbacks for decorated fields (#11495) (11cfe4d)

• (es/es3) Visit export decl body even if name is not reserved (#11473) (9113fff)

• (es/es3) Remove duplicate code (#11499) (fbee775)

• (es/minifier) Treat new expression with empty class as side-effect free (#11455) (a33a45e)

• (es/minifier) Escape control characters when converting strings to template literals (#11464) (028551f)

• (es/minifier) Handle unused parameters with default values (#11494) (6ed1ee9)

• (es/module) Preserve ./ prefix for hidden directory imports (#11489) (a005391)

• (es/parser) Validate dynamic import argument count (#11462) (2f67591)

• (es/parser) Allow compilation with --no-default-features (#11460) (b70c5f8)

• (es/parser) Skip emitting TS1102 in TypeScript mode (#11463) (e6f5b06)

• (es/parser) Reject ambiguous generic arrow functions in TSX mode (#11491) (ac00915)

• (es/parser) Disallow NumericLiteralSeparator with BigInts (#11510) (6b3644b)

• (es/react) Preserve HTML entity-encoded whitespace in JSX (#11474) (7d433a9)

• (es/renamer) Prevent duplicate parameter names with destructuring patterns (#11456) (e25a2c8)

• (es/testing) Skip update when expected output has invalid code (#11469) (2be6b8a)

• (es/typescript) Don't mark enums with opaque members as pure (#11452) (b713fae)

• (preset-env) Distinguish unknown browser vs empty config (#11457) (1310957)

Documentation

• Replace swc.config.js references with .swcrc (#11485) (fec8d2c)

Features

• (cli) Add --root-mode argument for .swcrc resolution (#11501) (b53a0e2)

• (es/module) Make module transforms optional via module feature (#11509) (b94a178)

• (es/regexp) Implement unicode property escape transpilation (#11472) (a2e0ba0)

• (es/transformer) Merge ES3 hooks into swc_ecma_transformer (#11503) (5efcac9)

Miscellaneous Tasks

• (es/minifier) Extend OrderedChain to support more node types (#11477) (aa9d789)

Performance

• (bindings) Optimize string handling by avoiding unnecessary clones (#11490) (81daaaa)

• (es/codegen) Make commit_pending_semi explicit in write_punct (#11492) (5a27fc0)

• (es/es2015) Port ES2015 transforms to hook-based visitors (#11484) (a54eb0e)

• (es/es3) Use hooks pattern for single AST traversal (#11483) (a139fba)

• (es/minifier) Use combined AST traversal (#11471) (c611663)

• (es/transformer) Add inline hint (#11508) (d72c9df)

Refactor

• (es/compat) Put ES3 crates behind feature flag (#11480) (d5a8d84)

Testing

• (es/minifier) Add test case for merge_imports order preservation (#11458) (b874a05)

• (es/parser) Add error tests for import.source and import.defer with too many args (#11466) (7313462)

• (es/parser) Check handler.has_errors() in test error parsing (#11487) (fade647)

• Replace deprecated cargo_bin function with cargo_bin! macro (#11461) (73f77b6)

Bug Fixes

• (ci) Handle merged PRs separately in milestone manager (#11409) (3554268)

• (es/compat) Preserve this context in nested arrow functions (#11423) (f2bdaf2)

• (es/es2017) Replace this in arrow functions during async-to-generator (#11450) (a993da6)

Features

• (bindings/wasm) Enable ecma_lints feature to support semantic error detection (#11414) (1faa4a5)

• (es/hooks) Implement VisitMutHook for Either type (#11428) (395c85e)

• (es/hooks) Implement VisitMutHook for Option<H> (#11429) (0bf1954)

• (es/hooks) Add VisitHook trait for immutable AST visitors (#11437) (3efb41d)

• (es/minifier) Improve nested template literal evaluation (#11411) (147df2f)

• (es/minifier) Remove inlined IIFE arg and param (#11436) (2bc5d40)

• (es/minifier) Remove inlined IIFE arg and param (#11446) (baa1ae3)

Miscellaneous Tasks

• (deps) Update rkyv (#11419) (432197b)

• (deps) Update lru to 0.16.3 (#11438) (67c2d75)

• (deps) Update browserslist-data to v0.1.5 (#11454) (e9f78f0)

• (helpers) Replace MagicString with ast-grep's built-in edit API (#11410) (a3f0d33)

• (hstr/wtf8) Address legacy FIXME comments by switching to derives (#11416) (f03bfd8)

Performance

• (es/codegen, es/utils) Migrate to dragonbox_ecma for faster Number::toString (#11412) (b7978cc)

• (es/react) Optimize JSX transforms to reduce allocations (#11425) (2a20cb6)

Refactor

• (es) Improve TypeScript transform configuration structure (#11434) (f33a975)

• (es/minifier) Migrate MinifierPass to Pass trait (#11442) (a41e631)

• (es/minifier) Improve tpl to str (#11415) (0239523)

• (es/react) Port to VisitMutHook (#11418) (9604d9c)

• (es/transformer) Remove OptionalHook wrapper in favor of Option<H> (#11430) (72da6bd)

• (es/transforms) Migrate TypeScript transform to Pass trait (#11439) (dd007c6)

Testing

• (es) Enable benchmark for swc (#11420) (3a50a25)

• Disable LTO for benchmarks (#11421) (af3c2d3)

• Use rstest as the test framework (#11417) (fae258f)

Ci

• Collapse preivous claude[bot] PR review comments (affb6a2)

Bug Fixes

• (es/minifier) Remove unused webpack-related code (#11397) (8e4eab4)

• (es/minifier) Evaluate TemplateLiteral in BinaryExpression (#11406) (8d1b6f6)

• (es/minifier) More strict check if cannot add ident when invoking IIFE (#11399) (03642aa)

Features

• (es/minifier) Support BinaryExpression for Evaluator (#11390) (6c76f0a)

• (es/transformer) Merge static_blocks (#11403) (55a5083)

Performance

• (es/parser) Remove Iterator implementation for Lexer (#11393) (5941018)

• (es/parser) Optimize do_outside_of_context and do_inside_of_context (#11394) (4210cf1)

• (es/parser) Remove is_first in lexer state (#11395) (97d903b)

• (es/parser) Use byte_search to optimize scan_jsx_token (#11398) (f9b4da2)

• Reduce binary size with panic=abort and ICU optimizations (#11401) (18088b2)

Refactor

• (es/compiler) Drop the crate (#11407) (8faa14e)

• (es/minifier) Move drop_console and unsafes from Pure to Optimizer (#11388) (ee40804)

• (es/parser) Distinguish JsxText from Str (#11387) (63c4c44)

Bug Fixes

• (es/minifier) Prevent unsafe sequence merging in super() calls (#11381) (eb02780)

• (es/transformer) Fix variable declaration for nullish coalescing in else-if branches (#11384) (6746002)

• (es/transforms) Update _ts_rewrite_relative_import_extension helper code (#11382) (1ec444e)

Features

• (es/transformer) Merge private_properties_in_object (#11378) (769c9d2)

Performance

• (es/minifier) Optimize data structures of ProgramData (#11374) (3639523)

Refactor

• (es/transformer) Port var injector (#11383) (cfff553)