@swc/wasm

Bug Fixes

• (ci) Install rustfmt before tagging releases

• (deps) Update cargo (major)

• (deps) Update npm

• (es/codegen) Escape inline script markers in regex literals

• (es/helpers) Convert Map and Set values to arrays

• (es/minifier) Mark variables assigned in a member object as accessed and mutated

• (es/minifier) Avoid capturing outer references in lexical loops

• (es/minifier) Preserve rest arg iterator

• (es/minifier) Avoid duplicate preserved class bindings

• (es/minifier) Track assignment aliases in member objects

• (es/minifier) Treat spread arguments of pure calls as side effects

• (es/minifier) Store IIFE arg inline into Finalizer

• (node) Allow DELETE grants on native cache volume roots

• (node) Restrict cache DELETE exemption to filesystem roots

Bug Fixes

• (es/codegen) Disambiguate TSX generic arrows

• (es/codegen) Preserve non-null token boundaries

• (es/codegen) Parenthesize typed arrow parameters

• (es/codegen) Preserve TypeScript token boundaries

• (es/codegen) Emit space after div if rhs starts with a regex

• (es/codegen) Preserve optional call type arguments

• (es/compat) Scope private access modes to each member

• (es/fixer) Preserve TypeScript expression grouping

• (es/fixer) Preserve TypeScript operand grouping

• (es/fixer) Avoid panicking on recovered parenthesized assignment targets

• (es/fixer) Preserve optional chain boundaries

• (es/fixer) Wrap function declarations in sloppy-mode loop bodies

• (es/minifier) Bound literal expressions copied by the sequential inliner

• (es/minifier) Preserve rest array identity when its reference runs more than once

• (es/minifier) Keep trimLeft and trimRight on string literals

• (es/minifier) Keep directive prologue when merging if returns

• (es/minifier) Preserve new async and generator

• (es/minifier) Release utils API required by registry builds

• (es/parser) Isolate enum await context

• (es/parser) Allow await function names in async arrow parameters

• (es/parser) Preserve invalid JSX numeric entities as literal text

• (es/parser) Allow namespace await identifiers

• (es/parser) Align TypeScript expression lookahead

• (es/parser) Do not treat optional get/set fields as accessors

• (es/parser) Recover non-entity expressions in TypeScript heritage clauses

• (native) Allow unmapped overflow owners in Linux cache ancestors

• (native-addon) Use ProgramData after unsafe Windows profile caches

• (react-compiler) Preserve intrinsic JSX tags during binding renames

• (ts/fast-strip) Preserve runtime boundaries during type erasure

Features

• (es/minifier) Inline async function used only once

• (es/minifier) Implement more rules for if-break

Performance

• (es/parser) Streamline numeric separator stripping

• (hstr) Allow Atom::as_str to inline across crates

Bug Fixes

• (bindings) Fall back to a secure Windows profile cache

• (bindings) Allow opting out of Unix cache root security checks

• (ci) Run main CodSpeed benchmarks after policy skips

• (ci) Match Rust's z10 baseline in s390x release builds

• (ci) Raise native addon MSRV to Rust 1.85

• (ci) Repair empty crate release changeset

• (cli) Resolve out-dir source map paths relative to output

• (deps) Update cargo

• (es/compat) Preserve consecutive loop labels

• (es/estree) Fix AST roundtrip bugs and implement missing conversions

  • BREAKING: fix AST roundtrip bugs and implement missing conversions

• (es/fixer) Preserve parentheses in JSX sequence expressions

• (es/preset-env) Lower for-await in native async functions

• (react-compiler) Protect long call chains from stack overflow

• Direct unapproved contributors to open issues

Features

• (ci) Restrict pull requests to trusted contributors

• (es/codegen) Support configurable output indentation

  • BREAKING: support configurable output indentation

Performance

• (es/compat) Skip empty block-scoping renames

• (es/parser) Scan template literals with byte search

Bug Fixes

• (swc_config) Show why an options object failed to deserialize

Performance

• (node) Optimize macOS native addon first load

Bug Fixes

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

• (bindings) Detect macOS ACLs with supported APIs

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

• (es/codegen) Minify unicode escapes in template literals

• (es/codegen) Separate generic type assertion openers

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

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

• (es/minifier) Check eval and arguments usage in var define scope

• (es/minifier) Drop unused object pattern defaults

• (es/minifier) Preserve Array spread arity

• (es/minifier) Preserve holes in array joins

• (es/minifier) Preserve catch return before finally

• (es/minifier) Skip prototype setters in Object.keys

• (es/minifier) Guard static helper evaluation

• (es/minifier) Preserve string import names

• (es/minifier) Preserve unsigned shift coercion

• (es/minifier) Fold missing codePointAt to undefined

• (es/minifier) Fold local deletes to false

• (es/minifier) Preserve Function.length arity

• (es/minifier) Preserve rest RegExp identity

• (es/minifier) Preserve lexical method defaults

• (es/minifier) Preserve arguments after IIFE spreads

• (es/minifier) Preserve string method arguments

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

• (es/minifier) Preserve constant switch test effects

• (es/minifier) Preserve shadowed undefined yield values

• (es/minifier) Retain unsafe Symbol call arguments

• (es/minifier) Guard similar if merges

• (es/minifier) Preserve conditional assignment target order

• (es/minifier) Preserve Set and Map iteration

• (es/minifier) Preserve sequence IIFE argument evaluation

• (es/minifier) Respect global defs root bindings

• (es/minifier) Format toExponential compatibly

• (es/minifier) Preserve tiny toPrecision calls

• (es/minifier) Preserve async IIFE return values

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

• (es/minifier) Safely hoist property callees

• (es/minifier) Preserve catch assignments before finally

• (es/minifier) Preserve delete operand effects

• (es/minifier) Preserve unary comparison evaluation order

• (es/minifier) Preserve branches when collapsing assignments

• (es/minifier) Preserve empty array assignments

• (es/minifier) Preserve empty IIFE parameter effects

• (es/minifier) Preserve empty join coercion

• (es/minifier) Preserve empty object destructuring errors

• (es/minifier) Deduplicate folded Object.keys

• (es/minifier) Preserve finalizer breaks in switches

• (es/minifier) Preserve strict equality for repeated calls

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

• (es/minifier) Preserve function expression names

• (es/minifier) Preserve finalizer completions

• (es/minifier) Evaluate String.raw templates with raw quasis

• (es/minifier) Preserve returns in finalizers

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

• (es/minifier) Preserve reassigned arguments access

• (es/minifier) Preserve switch fallthrough cases

• (es/minifier) Preserve lone surrogate template values

• (es/minifier) Preserve spread iteration in unused builtins

• (es/minifier) Preserve computed update targets

• (es/minifier) Check class side effect

• (es/minifier) Preserve let initialization when dropping unused variables

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

• (es/minifier) Preserve destructuring patterns with PURE-annotated initializers

• (es/minifier) Mark properties assigned through destructuring targets as mutated

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

• (es/minifier) Avoid inline arrow with this when used as arg

• (es/parser) Reject unicode escapes in RegExp flags

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

• (es/parser) Allow ambient rest trailing commas

• (es/parser) Respect line breaks after declare

• (es/parser) Parse optional generator methods

• (es/parser) Allow line breaks before import attributes

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

• (es/parser) Respect line breaks before definite assignment assertions

• (es/parser) Restore strict context after classes

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

• (es/parser) Allow eval and arguments in ambient function declarations

• (es/parser) Parse static constructor methods in JavaScript

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

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

• (es/parser) Preserve elisions in arrow binding patterns

• (es/parser) Isolate constructor function contexts

• (es/parser) Correctly round non-decimal numeric literals

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

• (es/parser) Preserve type references named asserts before line breaks

• (es/parser) Recognize named optional and rest tuple elements

• (es/parser) Support leading pipes in Flow match patterns

• (es/parser) Allow escaped keywords as property names

• (es/parser) Parse optional renamed Flow component parameters

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

• (hstr) Avoid panic in Wtf8::starts_with

• (html/minifier) Preserve adjacent script elements

• (html/parser) Preserve customizable select markup

• (node) Repair native release verification and cache handling

• (nodejs) Complete Amaro REPL support APIs

• Use Rust changeset package names

• Correct quoted package name in changeset

Features

• (bindings) Add private compressed native addon foundation

• (bindings) Gate native npm releases on verified carriers

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

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

• (es/module) Support moduleRoot for AMD module IDs

Performance

• (es/preset-env) Reduce binary size with browserslist deflate

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

• (swc_core) Deduplicate ICU dependencies

Mod

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

Revert

• (es/minifier) Revert #12384

Bug Fixes

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

• removed

  (es/decorators) Drop params from getter replacing decorated private method

• (es/flow) Preserve Flow component type semantics

• (es/minifier) Mark for update and test as executed multiple time

• (es/minifier) Report for loop var decl as assign

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

• (es/minifier) Drop spans of cached globals values

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

• (es/minifier) Avoid JSX sequence inlining loop

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

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

• (es/minifier) Preserve pure annotation ownership

• (es/parser) Retry ambiguous Program parsing

• (es/parser) Preserve await grammar boundaries

• (es/quote) Restore await parsing

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

• (swc) Key optimizer env cache by configured values

• (visit) Panic on invalid AST paths

Features

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

• (es/parser) Add opt-in parser-only TSRX lowering

Bug Fixes

• (encoding) Fix incorrect fields count

  • BREAKING: Fix incorrect fields count

• (es/ast) Prevent mutable reference escape

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

  • BREAKING: fix panic on JSX surrogate entities

• (es/es2015) Preserve this in static field parameters

• (es/minifier) Remove unused variable initializer cycles

• (es/minifier) Bound arguments parameter injection

• (es/preset-env) Lower unsupported async generators

• (hstr) Avoid references to uninitialized bytes

• (plugin) Make raw byte reconstruction unsafe

• (plugin/runner) Write Wasmer cache atomically

• (react-compiler) Make fast check conservative

• (react-compiler) Preserve TypeScript function overload signatures

Bug Fixes

• (es) Preserve numeric property key identity

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

• (es/codegen) Emit non-finite numeric literals

• (es/decorators) Avoid class state leakage for nested undecorated classes

• (es/minifier) Apply ToInt32 when folding bitwise NOT

• (es/minifier) Avoid inexact number radix folding

• (es/minifier) Preserve invalid Array lengths

• (es/minifier) Preserve non-canonical arguments access

• (es/minifier) Apply ToUint16 in fromCharCode

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

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

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

• (es/optimization) Preserve JSON numeric values

• (es/transforms) Use numeric literals for non-finite enum values

• (es/typescript) Evaluate cooked enum templates

• (html/minifier) Preserve JSON script boundaries

• (testing) Check ignored fixtures relative to crate root

• (ts/fast-strip) Preserve ASI before interpolated templates

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

Features

• (es/minifier) Expand support for trivial spreads

• (es/react-compiler) Expose reactCompiler.environment.enableFunctionOutlining

Performance

• (es/renamer) Skip identity rename mappings on apply

Bug Fixes

• (deps) Update crossbeam-epoch to 0.9.20

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

• (es/fixer) Preserve parens around PURE-annotated receivers

• (es/hygiene) Ignore eval in default hygiene pass

• (es/minifier) Eliminate unused classes with cyclic references

• (es/minifier) Preserve switch fallthrough termination

• (es/minifier) Check last case

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

• (es/minifier) Invoke IIFE when has eval

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

• (es/minifier) Measure number length precisely

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

• (es/module) Rewrite SystemJS transform

• (es/modules) Resolve relative symlinked inputs from cwd

• (es/react) Emit jsxdev source for fragments

• (es/react-compiler) Correct catch and parameter scope resolution

• (react-compiler) Remove React-like prefilter

• (ts/fast-strip) Handle generic arrow line breaks

Features

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

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

• (es/minifier) Remove unused param for new expr

• (wasm) Add @swc/nodejs-support-wasm

Bug Fixes

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

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

• (es/minifier) Gate Number(x) -> +x on unsafe flag

• (es/parser) Parse Flow bare renders types

• (es/parser) Allow no-default builds

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

• (es/react-compiler) Scope ClassStaticBlock and TsModuleBlock as var boundaries

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

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

• (react-compiler) Disable parser default features

Features

• (es/react-compiler) Add React Compiler

• (swc) Gate react compiler re-export

Bug Fixes

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

• (es/codegen) Emit export as namespace correctly

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

• (es/compat) Rewrite this in destructuring defaults

• (es/decorators) Delay 2022 decorator initializers after private fields

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

• (es/fixer) Preserve new tagged template callee parens

• (es/minifier) Handle unknown member props

• (es/parser) Handle Flow async generic arrows

• (es/renamer) Avoid duplicate mangled names across eval scope boundaries

• (plugin) Avoid importing __free from env

• (swc) Preserve plugin error context

• (swc_common) Fix sourcemap panic for multibyte mapping positions

Performance

• Lazily compute source file hashes

• Optimize Atom equality

Revert

• (es/decorators) Revert decorator initializer ordering

• (swc_common) Revert sourcemap multibyte mapping clamp

Bug Fixes

• (es/minifier) Preserve args for destructured callbacks

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

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

• (es/minifier) Preserve default parameter object props

• (es/parser) Reject object-rest assignment to array/object literal

• (es/parser) Reject object rest assignment to literals

• (es/react) Exclude self-recursive hooks from refresh dependency array

• (ts/fast-dts) Strip definite assertions in dts

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

• (typescript) Strip parameter binding defaults in dts

Features

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

• (swc_cli) Implement all features for swc_cli

Performance

• (ecma) Reduce transformer compat overhead

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

• (es/codegen) Remove JsWriter last_srcmap cache

• (es/minifier) Reduce minifier profiling hotspots

• Optimize es parser comment finalization

Security

• security

  Save CI caches only on main

• security

  Update rkyv and Rust dependencies

• security

  Harden PR workflow permissions

Bug Fixes

• (ci) Update rand lockfile entries

• (es/minifier) Fold unary bool nullish coalescing

• (es/minifier) Preserve for-init sequence order

• (es/parser) Parse empty Flow exact object type

Features

• Move swc ast explorer into workspace

Bug Fixes

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

• (es/flow) Avoid restoring module context when flow syntax is enabled

• (es/minifier) Preserve frozen spread registry keys

• (es/parser) Align Flow generic arrow JSX disambiguation

Features

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

Bug Fixes

• (deploy) Fix musl binding test workflow

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

• (es/jsx) Preserve quoted JSX attribute newlines

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

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

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

• (es/parser) Support Flow anonymous keyof indexers

• (es/parser) Add Flow strip RN and RNW regression corpus

Features

• (es/minify) Support extracting comments

Bug Fixes

• (es/decorators) Preserve super in moved static members

• (es/decorators) Scope moved static super rewrite

• (es/parser) Parse mixed Flow anonymous callable params

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

• (es/typescript) Handle TypeScript expressions in enum transformation

Features

• (swc_common) Add SourceMapper.map_raw_pos

• (swc_config) Add Hash/Eq for options and CachedRegex

Performance

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

Bug Fixes

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

• (es/minifier) Handle toExponential(undefined)

• (es/minifier) Cap deep if_return conditional chains

• (es/minifier) Inline prop shorthand in computed props

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

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

• (es/regexp) Preserve source for wrapped named groups

• (html/codegen) Keep for span-parent paragraphs

• (swc_common) Make eat_byte unsafe to prevent UTF-8 boundary violation

Features

• removed

  (es/minifier) Remove useless arguments for non inlined callee

• (react-compiler) Advance SWC parity for upstream fixtures

• (react-compiler) Tighten core validation parity for upstream fixtures

• (react-compiler) Improve SWC parity for early-return and hooks validation

• (react-compiler) M1 memo validators + lint gating alignment

• (react-compiler) Improve Stage A diagnostic parity and validation aggregation

• (react-compiler) Continue swc parity for dependency handling

Bug Fixes

• (cli) Honor externalHelpers=false in rust binary

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

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

• (es/fixer) Wrap new opt chain

• (es/flow) Normalize module await bindings for Hermes parity

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

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

• (es/module) Avoid rewriting unknown relative extensions

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

• (es/types) Add new options types

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

• Update lz4_flex to resolve RUSTSEC-2026-0041

Features

• (bindings) Add linux ppc64le and s390x support across npm bindings

• (bindings) Enable flow strip support in @swc/core

• (cli) Enable Flow strip support in swc_cli_impl

• (dbg-swc) Add flow strip verification command

• (es) Add swc_es_codegen for swc_es_ast

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

• (es) Add TypeScript + React transforms and tsc corpus tests

• (es/helpers) Prevent recursive instanceof helper transforms

• (es/parser) Add with_capacity for Capturing

• (es/parser) Add flow syntax mode and strip integration

• (es/parser) Finish flow strip support for core syntax gaps

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

• (es/parser) Support Flow declare export default interface strip path

• (es/parser) Add Hermes Flow parity harness and fixes

• (es/parser) Complete Hermes Flow stripping parity

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

• (es/react-compiler) Scaffold SWC port of Babel entrypoint

• (es/react-compiler) Phase1 crate API baseline and fixture harness

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

• (es/react-compiler) Advance strict upstream parity

• (es/react-compiler) Advance upstream fixture parity pipeline

• (es/semantics) Add scope analysis and statement-level cfg

• (es_parser) Complete parity suite with zero ignores

• (es_parser) Complete internal parser wiring without ecma runtime dep

• (es_parser) Expand benchmark corpus

• (react-compiler) Advance SWC upstream fixture parity

• (react-compiler) Improve lint rename and gating parity

• (swc_es_parser) Enforce full parity suite and extend grammar surface

• (swc_es_parser) Complete lossless modeling for with/TS module/decorators

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

• Complete core parity parser coverage

Performance

• (es/modules) Avoid export sort key clones

• (es/parser) Reduce JSX identifier rescan allocations

• (es/parser) Optimize underscore stripping in numeric literal hot path

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

• (es_parser) Byte-search lexer optimization pass

• (es_parser) Reduce lookahead and allocation overhead

• (ts/fast-strip) Avoid token capture in default transform path

Ci

• removed

  Remove --no-verify flag from cargo mono publish

Bug Fixes

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

Features

• (es/ast) Add runtime arena crate and bootstrap swc_es_ast

• (es/parser) Add swc_es_parser

Features

• (bindings) Add html wasm binding and publish wiring

• (sourcemap) Support safe scopes round-trip metadata

• Emit ECMA-426 source map scopes behind experimental flag

Bug Fixes

• (errors) Avoid panic on invalid diagnostic spans

• (es/helpers) Fix _object_without_properties crash on primitive values

• (es/jsx) Preserve whitespace before HTML entities

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

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

• (es/minifier) Inline before merge if

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

• (es/minifier) Inline side-effect-free default params

• (es/parser) Fix generic arrow function in TSX mode

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

• (es/regexp) Transpile unicode property escapes in RegExp constructor

Features

• (es/minifier) Add unsafe_hoist_static_method_alias option

• (es/minifier) Remove unused args for IIFE

Bug Fixes

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

• (es/decorators) Invoke addInitializer callbacks for decorated fields

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

• (es/es3) Remove duplicate code

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

• (es/minifier) Escape control characters when converting strings to template literals

• (es/minifier) Handle unused parameters with default values

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

• (es/parser) Validate dynamic import argument count

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

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

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

• (es/parser) Disallow NumericLiteralSeparator with BigInts

• (es/react) Preserve HTML entity-encoded whitespace in JSX

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

• (es/testing) Skip update when expected output has invalid code

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

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

Features

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

• (es/module) Make module transforms optional via module feature

• (es/regexp) Implement unicode property escape transpilation

• (es/transformer) Merge ES3 hooks into swc_ecma_transformer

Performance

• (bindings) Optimize string handling by avoiding unnecessary clones

• (es/codegen) Make commit_pending_semi explicit in write_punct

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

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

• (es/minifier) Use combined AST traversal

• (es/transformer) Add inline hint

Bug Fixes

• (ci) Handle merged PRs separately in milestone manager

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

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

Features

• (bindings/wasm) Enable ecma_lints feature to support semantic error detection

• (es/hooks) Implement VisitMutHook for Either type

• (es/hooks) Implement VisitMutHook for Option<H>

• (es/hooks) Add VisitHook trait for immutable AST visitors

• (es/minifier) Improve nested template literal evaluation

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

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

Performance

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

• (es/react) Optimize JSX transforms to reduce allocations

Refactor

• removed

  (es/transformer) Remove OptionalHook wrapper in favor of Option<H>

Bug Fixes

• (es/minifier) Remove unused webpack-related code

• (es/minifier) Evaluate TemplateLiteral in BinaryExpression

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

Features

• (es/minifier) Support BinaryExpression for Evaluator

• (es/transformer) Merge static_blocks

Performance

• (es/parser) Remove Iterator implementation for Lexer

• (es/parser) Optimize do_outside_of_context and do_inside_of_context

• (es/parser) Remove is_first in lexer state

• (es/parser) Use byte_search to optimize scan_jsx_token

• Reduce binary size with panic=abort and ICU optimizations

Bug Fixes

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

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

• (es/transforms) Update _ts_rewrite_relative_import_extension helper code

Features

• (es/transformer) Merge private_properties_in_object

Performance

• (es/minifier) Optimize data structures of ProgramData

Bug Fixes

• (es/transformer) Fix pass order

Features

• (es/minifier) Optimize typeof x == "undefined" to typeof x > "u"

• (es/transformer) Merge logical_assignment_operators

Performance

• (es/compat) Use merged transformer