Environment

• Biome CLI version: 2.3.11
• OS: macOS Darwin 25.2.0 (Apple Silicon)
• Node.js: v22.x

Description

Running biome check --write --unsafe causes Biome to hang indefinitely when the useConsistentTypeDefinitions rule is enabled and there are files with empty type aliases like type Foo = {}.

The issue does NOT occur with:

• biome check (without flags) - works fine
• biome check --write (without --unsafe) - works fine

Only --unsafe flag causes the hang.

Minimal Reproduction

test.tsx:

type EmptyProps = {}

function Component({}: EmptyProps) {
	return <div>test</div>
}

biome.json:

{
	"$schema": "https://biomejs.dev/schemas/2.3.11/schema.json",
	"linter": {
		"enabled": true,
		"rules": {
			"style": {
				"useConsistentTypeDefinitions": "error"
			}
		}
	}
}

Command:

biome check --write --unsafe test.tsx
# Hangs indefinitely

Expected Behavior

Biome should apply the unsafe fix (converting type to interface or vice versa) and exit.

Actual Behavior

Biome hangs indefinitely, consuming CPU. The process never exits and must be killed manually.

Workaround

Disable the useConsistentTypeDefinitions rule:

{
	"linter": {
		"rules": {
			"style": {
				"useConsistentTypeDefinitions": "off"
			}
		}
	}
}

Related Issues

• 💅 Hang (infinite loop) while fixing JS file #6692 - Hang (infinite loop) while fixing JS file
• 💅 Using unsafe fix triggers an infinite cycle! #4907 - Using unsafe fix triggers an infinite cycle