yarn format-swift skips formatting with Xcode 27.1, whose swift-format reports its version as main

Description

scripts/format-swift.js keeps a swift-format only when its --version output parses as 6.3 or newer: parseSwiftFormatVersion (L49-L61) reads swift-format <major>.<minor>, Swift version <major>.<minor> or a bare <major>.<minor>. The swift-format in Xcode 27.1 (Swift 6.4) prints main for both swift format --version and xcrun swift-format --version, so the script finds no formatter, prints its "Skipping Swift formatting" warning and exits 0. yarn format-swift, yarn format-check-swift and yarn format then pass without formatting or checking any Swift file.

Steps to reproduce

On macOS with Xcode 27.1, at main c12d0b3:

swift format --version. Expected: a version. Seen: main.
node scripts/format-swift.js --check. Expected: swift-format checks the repository's Swift files. Seen: the warning below, then exit 0.

React Native Version

main (c12d0b3)

Affected Platforms

Build - MacOS

Output of `npx @react-native-community/cli info`

Not applicable: this is the repository's own scripts/format-swift.js.

Stacktrace or Logs

macOS 27.0.1, Node 26.12.1:

$ xcodebuild -version
Xcode 27.1
Build version 27A9275
$ swift --version
swift-driver version: 1.168.6 Apple Swift version 6.4 (swiftlang-6.4.0.34.1 clang-2100.3.34.1)
$ swift format --version
main
$ xcrun swift-format --version
main
$ node scripts/format-swift.js --check
warning: Skipping Swift formatting because swift-format 6.3 or newer was not found.
Please install Swift 6.3 or newer and make sure `swift-format` or `swift` is in your PATH, or set SWIFT_FORMAT=/path/to/swift-format.
exit 0

MANDATORY Reproducer

The repository's own script on main:

react-native/scripts/format-swift.js

Lines 49 to 61 in c12d0b3

    
           function parseSwiftFormatVersion(output) { 
        
             const version = 
        
               /swift-format(?: version)?[:\s]+(\d+)\.(\d+)/i.exec(output) ?? 
        
               /Swift version\s+(\d+)\.(\d+)/i.exec(output) ?? 
        
               /^\s*(\d+)\.(\d+)/.exec(output); 
        
             if (version == null) { 
        
               return null; 
        
             } 
        
             const reportedMajor = Number(version[1]); 
        
             return reportedMajor >= 100 
        
               ? [Math.floor(reportedMajor / 100), reportedMajor % 100] 
        
               : [reportedMajor, Number(version[2])]; 
        
           }

, which reads the version this way since #58463 added it

Screenshots and Videos

No response

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The reproducer is the repository's own scripts/format-swift.js on main, which reads the version this way since #58463: the body has the commands and their output with Xcode 27.1.

Fix Swift formatter detection when version is main

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`yarn format-swift` skips formatting with Xcode 27.1, whose swift-format reports its version as `main` #59598

Description

Steps to reproduce

React Native Version

Affected Platforms

Output of `npx @react-native-community/cli info`

Stacktrace or Logs

MANDATORY Reproducer

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	function parseSwiftFormatVersion(output) {
	const version =
	/swift-format(?: version)?[:\s]+(\d+)\.(\d+)/i.exec(output) ??
	/Swift version\s+(\d+)\.(\d+)/i.exec(output) ??
	/^\s*(\d+)\.(\d+)/.exec(output);
	if (version == null) {
	return null;
	}
	const reportedMajor = Number(version[1]);
	return reportedMajor >= 100
	? [Math.floor(reportedMajor / 100), reportedMajor % 100]
	: [reportedMajor, Number(version[2])];
	}

yarn format-swift skips formatting with Xcode 27.1, whose swift-format reports its version as main #59598

Description

Description

Steps to reproduce

React Native Version

Affected Platforms

Output of npx @react-native-community/cli info

Stacktrace or Logs

MANDATORY Reproducer

Screenshots and Videos

Activity

react-native-bot commented on Oct 29, 2026

YevheniiKotyrlo commented on Oct 29, 2026

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Issue actions

`yarn format-swift` skips formatting with Xcode 27.1, whose swift-format reports its version as `main` #59598

Output of `npx @react-native-community/cli info`