Cover readonly hooked properties in interfaces

Author: jakubtobiasz

src/Rules/Properties/PropertiesInInterfaceRule.php

@@ -57,6 +57,15 @@ public function processNode(Node $node, Scope $scope): array
 			];
 		}
 
+		if ($node->isReadOnly()) {
+			return [
+				RuleErrorBuilder::message('Interfaces cannot include readonly hooked properties.')
+					->nonIgnorable()
+					->identifier('property.readOnlyInInterface')
+					->build(),
+			];
+		}
+
 		if ($this->hasAnyHookBody($node)) {
 			return [
 				RuleErrorBuilder::message('Interfaces cannot include property hooks with bodies.')

tests/PHPStan/Rules/Properties/PropertiesInInterfaceRuleTest.php

@@ -118,4 +118,26 @@ public function testPhp84AndPropertyHooksWithBodiesInInterface(): void
 		]);
 	}
 
+	public function testPhp84AndReadonlyPropertyHooksInInterface(): void
+	{
+		if (PHP_VERSION_ID < 80400) {
+			$this->markTestSkipped('Test requires PHP 8.4 or later.');
+		}
+
+		$this->analyse([__DIR__ . '/data/readonly-property-hooks-in-interface.php'], [
+			[
+				'Interfaces cannot include readonly hooked properties.',
+				7,
+			],
+			[
+				'Interfaces cannot include readonly hooked properties.',
+				9,
+			],
+			[
+				'Interfaces cannot include readonly hooked properties.',
+				11,
+			]
+		]);
+	}
+
 }

tests/PHPStan/Rules/Properties/data/readonly-property-hooks-in-interface.php

@@ -0,0 +1,12 @@
+<?php declare(strict_types=1);
+
+namespace ReadonlyPropertyHooksInInterface;
+
+interface HelloWorld
+{
+	public readonly string $firstName { get; set; }
+
+	public readonly string $middleName { get; }
+
+	public readonly string $lastName { set; }
+}