chore(deps): update dependency @swc/core to v1.15.21

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@swc/core (source)	1.15.10 → 1.15.21

---

Release Notes

swc-project/swc (@​swc/core)

v1.15.21

Compare Source

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)

v1.15.18

Compare Source

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)

v1.15.17

Compare Source

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)

v1.15.13

Compare Source

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)

v1.15.11

Compare Source

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)

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