feat!: disable .swcrc reading in JavaScript compiler

[CPunisher]

Summary

This PR removes the logic for searching, loading, and parsing .swcrc files within the JavaScriptCompiler.

Related links

None

Checklist

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

[netlify]

✅ Deploy Preview for rspack canceled.

Name	Link
🔨 Latest commit	c5ee1f6
🔍 Latest deploy log	https://app.netlify.com/projects/rspack/deploys/695e592dff334b000896d5c2

[Copilot]

Pull request overview

This PR simplifies the JavaScript compiler by removing the logic for loading and parsing .swcrc configuration files. Instead, the compiler now expects the caller to provide fully populated SwcOptions, centralizing configuration handling and eliminating redundant file system operations.

• Removed four helper functions related to .swcrc file discovery, loading, and parsing
• Eliminated the config field from JavaScriptTransformer struct and updated all references
• Added Rust formatter configuration to VS Code settings

Reviewed changes

Copilot reviewed 1 out of 1 changed files in this pull request and generated no comments.

File	Description
crates/rspack_javascript_compiler/src/compiler/transform.rs	Removed .swcrc configuration loading logic, cleaned up imports, simplified JavaScriptTransformer struct, and updated references from self.config to self.options.config
.vscode/settings.json	Added default Rust formatter configuration for better developer experience

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[github-actions]

Rsdoctor Bundle Diff Analysis

Found 5 projects in monorepo, 5 projects with changes.

📊 Quick Summary

Project	Total Size	Change
react-10k	5.7 MB	-
react-1k	825.4 KB	-
react-5k	2.7 MB	-
rome	984.3 KB	-
ui-components	2.1 MB	-

📋 Detailed Reports (Click to expand)

📁 react-10k

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

⚠️ No baseline data found - Unable to perform comparison analysis

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

📁 react-1k

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

⚠️ No baseline data found - Unable to perform comparison analysis

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

📁 react-5k

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

⚠️ No baseline data found - Unable to perform comparison analysis

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

📁 rome

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

⚠️ No baseline data found - Unable to perform comparison analysis

Metric	Current	Baseline	Change
📊 Total Size	984.3 KB	-	-
📄 JavaScript	984.3 KB	-	-
🎨 CSS	0 B	-	-
🌐 HTML	0 B	-	-
📁 Other Assets	0 B	-	-

📁 ui-components

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

⚠️ No baseline data found - Unable to perform comparison analysis

Metric	Current	Baseline	Change
📊 Total Size	2.1 MB	-	-
📄 JavaScript	2.0 MB	-	-
🎨 CSS	83.0 KB	-	-
🌐 HTML	0 B	-	-
📁 Other Assets	0 B	-	-

Generated by Rsdoctor GitHub Action

[github-actions]

📦 Binary Size-limit

Comparing c5ee1f6 to refactor: afterCodeGeneration hook use read only compilation ref (#12655) by pshu

🎉 Size decreased by 327.63KB from 47.87MB to 47.55MB (⬇️0.67%)

[codspeed-hq]

Merging this PR will not alter performance

Summary

✅ 16 untouched benchmarks
⏩ 1 skipped benchmark¹

---

_{Comparing 01-07-feat-2/disable-swcrc (c5ee1f6) with main (25a4021)²}

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. ↩

2. No successful run was found on main (86634a0) during the generation of this report, so 25a4021 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩