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chore: bump swc_core from 55 to 56 and swc-experimental from 0.4.1 to 0.5.0#12906

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02-02-chore/bump-swc
Feb 3, 2026
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chore: bump swc_core from 55 to 56 and swc-experimental from 0.4.1 to 0.5.0#12906
hardfist merged 5 commits intomainfrom
02-02-chore/bump-swc

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@CPunisher CPunisher commented Feb 2, 2026 •
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Summary

SWC: https://github.com/swc-project/swc/blob/main/CHANGELOG-CORE.md

  1. API BREAKING: SWC disable module transformation feature by default (feat(swc): Make module transforms optional via module feature swc-project/swc#11509). However, rspack depends on it to transform the typescript config files.
  2. Performant combined AST traversal (WIP by kdy). This will reduce the visit passes of javascript syntax lowering.
  3. (es/minifier) Remove inlined IIFE arg and param
  4. Lots of bug fixes

SWC-experimental: https://github.com/CPunisher/swc-experimental/releases/tag/v0.5.0

  1. API BREAKING: Temporarily remove free_node.

A a faster preorder visit based on the node array has been tried in #12369,
which depends on free_node during parsing.
However, a better mutability story on swc_experimental is designing and free_node is removed temporarily.
Once it's finished, this function will be reverted back.

  1. Deduplicate strings in the AST using https://crates.io/crates/string-interner and reference them via u32 IDs. While this degrades parser performance, it is expected to improve subsequent analysis performance. This is a breaking change but rspack doesn't use it currently.

Checklist

  • Tests updated (or not required).
  • Documentation updated (or not required).

@CPunisher CPunisher requested a review from quininer as a code owner February 2, 2026 05:51
Copilot AI review requested due to automatic review settings February 2, 2026 05:51
@github-actions github-actions bot added the team The issue/pr is created by the member of Rspack. label Feb 2, 2026
Copilot AI reviewed Feb 2, 2026
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Pull request overview

This PR upgrades SWC dependencies from version 55 to 56 for swc_core and from 0.4.1 to 0.5.0 for swc-experimental packages. The upgrade includes a refactoring of the identifier collection logic in concatenated_module.rs to use a visitor pattern instead of node array iteration, as the free_node API was temporarily removed from swc-experimental.

Changes:

  • Upgraded swc_core and related packages (swc, swc_ecma_minifier, swc_html_minifier) to their latest versions
  • Upgraded swc-experimental packages (swc_experimental_ecma_ast, swc_experimental_ecma_parser, swc_experimental_ecma_semantic) from 0.4.1 to 0.5.0
  • Refactored collect_ident function to use the visitor pattern, porting logic from utils::IdentCollector

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 1 comment.

File Description
Cargo.toml Updated version constraints for swc_core (55.0.0 → 56.0.0), swc (53.0.0 → 54.0.0), swc_ecma_minifier (43.0.0 → 44.0.0), swc_html_minifier (43.0.0 → 44.0.0), and swc-experimental packages (0.4.1 → 0.5.0)
crates/rspack_workspace/src/generated.rs Updated the generated swc_core version string from "55.0.0" to "56.0.0"
crates/rspack_core/src/concatenated_module.rs Refactored collect_ident to use visitor pattern; updated imports to include Visit, VisitWith, ObjectPatProp, and Prop; changed function signature to accept Module instead of Semantic
Cargo.lock Comprehensive lockfile update reflecting all transitive dependency changes from the version bumps, including new dependencies like string-interner and swc_ecma_regexp family

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github-actions bot commented Feb 2, 2026 •
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Rsdoctor Bundle Diff Analysis

Found 5 projects in monorepo, 5 projects with changes.

📊 Quick Summary
Project Total Size Change
react-10k 5.7 MB -11.0 B (-0.0%)
react-1k 825.4 KB -11.0 B (-0.0%)
react-5k 2.7 MB -11.0 B (-0.0%)
rome 984.2 KB -8.0 B (-0.0%)
ui-components 2.2 MB -67.0 B (-0.0%)
📋 Detailed Reports (Click to expand)

📁 react-10k

Path: ../build-tools-performance/cases/react-10k/dist/rsdoctor-data.json

📌 Baseline Commit: 953025ee89 | PR: #12900

Metric Current Baseline Change
📊 Total Size 5.7 MB 5.7 MB -11.0 B (-0.0%)
📄 JavaScript 5.7 MB 5.7 MB -11.0 B (-0.0%)
🎨 CSS 21.0 B 21.0 B 0
🌐 HTML 0 B 0 B 0
📁 Other Assets 0 B 0 B 0

📦 Download Diff Report: react-10k Bundle Diff

📁 react-1k

Path: ../build-tools-performance/cases/react-1k/dist/rsdoctor-data.json

📌 Baseline Commit: 953025ee89 | PR: #12900

Metric Current Baseline Change
📊 Total Size 825.4 KB 825.4 KB -11.0 B (-0.0%)
📄 JavaScript 825.4 KB 825.4 KB -11.0 B (-0.0%)
🎨 CSS 0 B 0 B 0
🌐 HTML 0 B 0 B 0
📁 Other Assets 0 B 0 B 0

📦 Download Diff Report: react-1k Bundle Diff

📁 react-5k

Path: ../build-tools-performance/cases/react-5k/dist/rsdoctor-data.json

📌 Baseline Commit: 953025ee89 | PR: #12900

Metric Current Baseline Change
📊 Total Size 2.7 MB 2.7 MB -11.0 B (-0.0%)
📄 JavaScript 2.7 MB 2.7 MB -11.0 B (-0.0%)
🎨 CSS 21.0 B 21.0 B 0
🌐 HTML 0 B 0 B 0
📁 Other Assets 0 B 0 B 0

📦 Download Diff Report: react-5k Bundle Diff

📁 rome

Path: ../build-tools-performance/cases/rome/dist/rsdoctor-data.json

📌 Baseline Commit: 953025ee89 | PR: #12900

Metric Current Baseline Change
📊 Total Size 984.2 KB 984.2 KB -8.0 B (-0.0%)
📄 JavaScript 984.2 KB 984.2 KB -8.0 B (-0.0%)
🎨 CSS 0 B 0 B 0
🌐 HTML 0 B 0 B 0
📁 Other Assets 0 B 0 B 0

📦 Download Diff Report: rome Bundle Diff

📁 ui-components

Path: ../build-tools-performance/cases/ui-components/dist/rsdoctor-data.json

📌 Baseline Commit: 953025ee89 | PR: #12900

Metric Current Baseline Change
📊 Total Size 2.2 MB 2.2 MB -67.0 B (-0.0%)
📄 JavaScript 2.0 MB 2.0 MB -67.0 B (-0.0%)
🎨 CSS 267.8 KB 267.8 KB 0
🌐 HTML 0 B 0 B 0
📁 Other Assets 0 B 0 B 0

📦 Download Diff Report: ui-components Bundle Diff

Generated by Rsdoctor GitHub Action

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github-actions bot commented Feb 2, 2026 •
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📦 Binary Size-limit

Comparing c5404ac to feat: support import.defer() for statical path (#12900) by Gengkun

❌ Size increased by 62.50KB from 48.31MB to 48.37MB (⬆️0.13%)

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codspeed-hq bot commented Feb 2, 2026 •
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CodSpeed Performance Report

Merging this PR will not alter performance

Comparing 02-02-chore/bump-swc (c5404ac) with main (953025e)

Summary

✅ 16 untouched benchmarks
⏩ 1 skipped benchmark1

Footnotes

  1. 1 benchmark was skipped, so the baseline result was used instead. If it was deleted from the codebase, click here and archive it to remove it from the performance reports. ↩

@CPunisher CPunisher requested a review from hardfist February 2, 2026 06:35
@hardfist hardfist merged commit 2f3aa4e into main Feb 3, 2026
49 of 51 checks passed
@hardfist hardfist deleted the 02-02-chore/bump-swc branch February 3, 2026 02:35
@CPunisher CPunisher mentioned this pull request Mar 2, 2026
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