Tips for always used properties and constants extensions

Author: ondrejmirtes

src/Rules/DeadCode/UnusedPrivateConstantRule.php

@@ -85,6 +85,7 @@ public function processNode(Node $node, Scope $scope): array
 					'classStartLine' => $node->getClass()->getStartLine(),
 					'constantName' => $constantName,
 				])
+				->tip(sprintf('See: %s', 'https://phpstan.org/developing-extensions/always-used-class-constants'))
 				->build();
 		}
 

src/Rules/DeadCode/UnusedPrivatePropertyRule.php

@@ -185,6 +185,7 @@ public function processNode(Node $node, Scope $scope): array
 			} else {
 				$propertyName = sprintf('Property %s::$%s', $scope->getClassReflection()->getDisplayName(), $name);
 			}
+			$tip = sprintf('See: %s', 'https://phpstan.org/developing-extensions/always-read-written-properties');
 			if (!$data['read']) {
 				if (!$data['written']) {
 					$errors[] = RuleErrorBuilder::message(sprintf('%s is unused.', $propertyName))
@@ -196,12 +197,13 @@ public function processNode(Node $node, Scope $scope): array
 							'classStartLine' => $node->getClass()->getStartLine(),
 							'propertyName' => $name,
 						])
+						->tip($tip)
 						->build();
 				} else {
-					$errors[] = RuleErrorBuilder::message(sprintf('%s is never read, only written.', $propertyName))->line($propertyNode->getStartLine())->build();
+					$errors[] = RuleErrorBuilder::message(sprintf('%s is never read, only written.', $propertyName))->line($propertyNode->getStartLine())->tip($tip)->build();
 				}
 			} elseif (!$data['written'] && (!array_key_exists($name, $uninitializedProperties) || !$this->checkUninitializedProperties)) {
-				$errors[] = RuleErrorBuilder::message(sprintf('%s is never written, only read.', $propertyName))->line($propertyNode->getStartLine())->build();
+				$errors[] = RuleErrorBuilder::message(sprintf('%s is never written, only read.', $propertyName))->line($propertyNode->getStartLine())->tip($tip)->build();
 			}
 		}
 

tests/PHPStan/Rules/DeadCode/UnusedPrivateConstantRuleTest.php

@@ -38,10 +38,12 @@ public function testRule(): void
 			[
 				'Constant UnusedPrivateConstant\Foo::BAR_CONST is unused.',
 				10,
+				'See: https://phpstan.org/developing-extensions/always-used-class-constants',
 			],
 			[
 				'Constant UnusedPrivateConstant\TestExtension::UNUSED is unused.',
 				23,
+				'See: https://phpstan.org/developing-extensions/always-used-class-constants',
 			],
 		]);
 	}

tests/PHPStan/Rules/DeadCode/UnusedPrivatePropertyRuleTest.php

@@ -67,60 +67,75 @@ public function testRule(): void
 		$this->alwaysWrittenTags = [];
 		$this->alwaysReadTags = [];
 
+		$tip = 'See: https://phpstan.org/developing-extensions/always-read-written-properties';
+
 		$this->analyse([__DIR__ . '/data/unused-private-property.php'], [
 			[
 				'Property UnusedPrivateProperty\Foo::$bar is never read, only written.',
 				10,
+				$tip,
 			],
 			[
 				'Property UnusedPrivateProperty\Foo::$baz is unused.',
 				12,
+				$tip,
 			],
 			[
 				'Property UnusedPrivateProperty\Foo::$lorem is never written, only read.',
 				14,
+				$tip,
 			],
 			[
 				'Property UnusedPrivateProperty\Bar::$baz is never written, only read.',
 				57,
+				$tip,
 			],
 			[
 				'Static property UnusedPrivateProperty\Baz::$bar is never read, only written.',
 				86,
+				$tip,
 			],
 			[
 				'Static property UnusedPrivateProperty\Baz::$baz is unused.',
 				88,
+				$tip,
 			],
 			[
 				'Static property UnusedPrivateProperty\Baz::$lorem is never written, only read.',
 				90,
+				$tip,
 			],
 			[
 				'Property UnusedPrivateProperty\Lorem::$baz is never read, only written.',
 				117,
+				$tip,
 			],
 			[
 				'Property class@anonymous/tests/PHPStan/Rules/DeadCode/data/unused-private-property.php:152::$bar is unused.',
 				153,
+				$tip,
 			],
 			[
 				'Property UnusedPrivateProperty\DolorWithAnonymous::$foo is unused.',
 				148,
+				$tip,
 			],
 		]);
 		$this->analyse([__DIR__ . '/data/TestExtension.php'], [
 			[
 				'Property UnusedPrivateProperty\TestExtension::$unused is unused.',
 				8,
+				$tip,
 			],
 			[
 				'Property UnusedPrivateProperty\TestExtension::$read is never written, only read.',
 				10,
+				$tip,
 			],
 			[
 				'Property UnusedPrivateProperty\TestExtension::$written is never read, only written.',
 				12,
+				$tip,
 			],
 		]);
 	}
@@ -129,14 +144,17 @@ public function testAlwaysUsedTags(): void
 	{
 		$this->alwaysWrittenTags = ['@ORM\Column'];
 		$this->alwaysReadTags = ['@get'];
+		$tip = 'See: https://phpstan.org/developing-extensions/always-read-written-properties';
 		$this->analyse([__DIR__ . '/data/private-property-with-tags.php'], [
 			[
 				'Property PrivatePropertyWithTags\Foo::$title is never read, only written.',
 				13,
+				$tip,
 			],
 			[
 				'Property PrivatePropertyWithTags\Foo::$text is never written, only read.',
 				18,
+				$tip,
 			],
 		]);
 	}
@@ -155,10 +173,12 @@ public function testBug3636(): void
 		}
 		$this->alwaysWrittenTags = [];
 		$this->alwaysReadTags = [];
+		$tip = 'See: https://phpstan.org/developing-extensions/always-read-written-properties';
 		$this->analyse([__DIR__ . '/data/bug-3636.php'], [
 			[
 				'Property Bug3636\Bar::$date is never written, only read.',
 				22,
+				$tip,
 			],
 		]);
 	}
@@ -171,10 +191,12 @@ public function testPromotedProperties(): void
 
 		$this->alwaysWrittenTags = [];
 		$this->alwaysReadTags = ['@get'];
+		$tip = 'See: https://phpstan.org/developing-extensions/always-read-written-properties';
 		$this->analyse([__DIR__ . '/data/unused-private-promoted-property.php'], [
 			[
 				'Property UnusedPrivatePromotedProperty\Foo::$lorem is never read, only written.',
 				12,
+				$tip,
 			],
 		]);
 	}