v1.13.3

Compare Source

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)

v1.13.2

Compare Source

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)

v0.25.9

Compare Source

• Better support building projects that use Yarn on Windows (#​3131, #​3663)

  With this release, you can now use esbuild to bundle projects that use Yarn Plug'n'Play on Windows on drives other than the C: drive. The problem was as follows:

  1. Yarn in Plug'n'Play mode on Windows stores its global module cache on the C: drive
  2. Some developers put their projects on the D: drive
  3. Yarn generates relative paths that use ../.. to get from the project directory to the cache directory
  4. Windows-style paths don't support directory traversal between drives via .. (so D:\.. is just D:)
  5. I didn't have access to a Windows machine for testing this edge case

  Yarn works around this edge case by pretending Windows-style paths beginning with C:\ are actually Unix-style paths beginning with /C:/, so the ../.. path segments are able to navigate across drives inside Yarn's implementation. This was broken for a long time in esbuild but I finally got access to a Windows machine and was able to debug and fix this edge case. So you should now be able to bundle these projects with esbuild.

• Preserve parentheses around function expressions (#​4252)

  The V8 JavaScript VM uses parentheses around function expressions as an optimization hint to immediately compile the function. Otherwise the function would be lazily-compiled, which has additional overhead if that function is always called immediately as lazy compilation involves parsing the function twice. You can read V8's blog post about this for more details.

  Previously esbuild did not represent parentheses around functions in the AST so they were lost during compilation. With this change, esbuild will now preserve parentheses around function expressions when they are present in the original source code. This means these optimization hints will not be lost when bundling with esbuild. In addition, esbuild will now automatically add this optimization hint to immediately-invoked function expressions. Here's an example:

  // Original code
  const fn0 = () => 0
  const fn1 = (() => 1)
  console.log(fn0, function() { return fn1() }())
  // Old output
  const fn0 = () => 0;
  const fn1 = () => 1;
  console.log(fn0, function() {
   return fn1();
  }());
  // New output
  const fn0 = () => 0;
  const fn1 = (() => 1);
  console.log(fn0, (function() {
   return fn1();
  })());

  Note that you do not want to wrap all function expressions in parentheses. This optimization hint should only be used for functions that are called on initial load. Using this hint for functions that are not called on initial load will unnecessarily delay the initial load. Again, see V8's blog post linked above for details.

• Update Go from 1.23.10 to 1.23.12 (#​4257, #​4258)

  This should have no effect on existing code as this version change does not change Go's operating system support. It may remove certain false positive reports (specifically CVE-2025-4674 and CVE-2025-47907) from vulnerability scanners that only detect which version of the Go compiler esbuild uses.

v4.46.4

Compare Source

2025年08月20日

Bug Fixes

• Do not omit synthetic namespaces when only accessed via in operator (#​6052)

Pull Requests

• #​6052: fix: don't optimize in with syntheticNamedExports (@​hi-ogawa)
• #​6074: Update transitive dependency to fix audit (@​lukastaegert)

v4.46.3

Compare Source

2025年08月18日

Bug Fixes

• Resolve illegal instruction error on arm64 architectures (#​6055)
• Resolve sourcemap generation performance regression (#​6057)

Pull Requests

• #​6043: Avoid generated by comment diff on Windows (@​sapphi-red)
• #​6048: chore(deps): update dependency cross-env to v10 (@​renovate[bot], @​lukastaegert)
• #​6049: fix(deps): lock file maintenance minor/patch updates (@​renovate[bot])
• #​6055: Fix illegal instruction error on arm64 by enabling no_opt_arch feature for mimalloc-safe (@​sapphi-red)
• #​6057: fix: tweak the fallback logic for tracing segment (@​TrickyPi, @​lukastaegert)
• #​6062: docs: update Rust toolchain instructions (@​situ2001, @​lukastaegert)
• #​6063: fix(deps): lock file maintenance minor/patch updates (@​renovate[bot], @​lukastaegert)
• #​6067: chore(deps): update actions/checkout action to v5 (@​renovate[bot], @​lukastaegert)
• #​6068: chore(deps): update actions/download-artifact action to v5 (@​renovate[bot])
• #​6069: fix(deps): update rust crate swc_compiler_base to v31 (@​renovate[bot], @​lukastaegert)

v4.46.2

Compare Source

2025年07月29日

Bug Fixes

• Fix in-operator handling for external namespace and when the left side cannot be analyzed (#​6041)

Pull Requests

• #​6041: Correct the logic of include in BinaryExpression and don't optimize external references away (@​TrickyPi, @​cyyynthia, @​lukastaegert)

v4.46.1

Compare Source

2025年07月28日

Bug Fixes

• Do not fail when using the in operator on external namespaces (#​6036)

Pull Requests

• #​6036: disables optimization for external namespace when using the in operator (@​TrickyPi)

v4.46.0

Compare Source

2025年07月27日

Features

• Optimize in checks on namespaces to keep them treeshake-able (#​6029)

Pull Requests

• #​5991: feat: update linux-loongarch64-gnu (@​wojiushixiaobai, @​lukastaegert)
• #​6029: feat: optimize in checks on namespaces to keep them treeshake-able (@​cyyynthia, @​lukastaegert)
• #​6033: fix(deps): update swc monorepo (major) (@​renovate[bot], @​lukastaegert)

v4.45.3

Compare Source

2025年07月26日

Bug Fixes

• Do not fail build if a const is reassigned but warn instead (#​6020)
• Fail with a helpful error message if an exported binding is not defined (#​6023)

Pull Requests

• #​6014: chore(deps): update dependency @​vue/language-server to v3 (@​renovate[bot])
• #​6015: chore(deps): update dependency vue-tsc to v3 (@​renovate[bot], @​lukastaegert)
• #​6016: fix(deps): update swc monorepo (major) (@​renovate[bot], @​lukastaegert)
• #​6017: fix(deps): lock file maintenance minor/patch updates (@​renovate[bot], @​lukastaegert)
• #​6020: Make const reassignments only a warning (@​lukastaegert)
• #​6023: Throw descriptive error message for used export is not defined (@​TrickyPi)
• #​6027: feat: upgrade to NAPI-RS 3 stable (@​Brooooooklyn)
• #​6028: Update eslint-plugin-unicorn to resolve vulnerability (@​lukastaegert)
• #​6034: fix(deps): lock file maintenance minor/patch updates (@​renovate[bot], @​lukastaegert)

v6.2.3

Compare Source

Fixes:

• Preserve imports for types used in typeof generic

Thank you:

Features, fixes and improvements in this release have been contributed by:

• @​dayongkr