Fix up TypeFactory return type.

extension.neon

@@ -54,3 +54,7 @@ services:
 		factory: CakeDC\PHPStan\Type\BaseTraitExpressionTypeResolverExtension(Cake\ORM\Locator\LocatorAwareTrait, fetchTable, %s\Model\Table\%sTable, defaultTable)
 		tags:
 			- phpstan.broker.expressionTypeResolverExtension
+	-
+		class: CakeDC\PHPStan\Type\TypeFactoryBuildDynamicReturnTypeExtension
+		tags:
+			- phpstan.broker.dynamicStaticMethodReturnTypeExtension

phpstan.neon

@@ -13,3 +13,7 @@ parameters:
     ignoreErrors:
         -
             identifier: missingType.generics
+        -
+            identifier: phpstanApi.runtimeReflection
+            message: '#Creating new ReflectionClass is a runtime reflection concept#'
+            path: src/Type/TypeFactoryBuildDynamicReturnTypeExtension.php

src/Type/TypeFactoryBuildDynamicReturnTypeExtension.php

@@ -0,0 +1,118 @@
+<?php
+declare(strict_types=1);
+
+/**
+ * Copyright 2025, Cake Development Corporation (https://www.cakedc.com)
+ *
+ * Licensed under The MIT License
+ * Redistributions of files must retain the above copyright notice.
+ *
+ * @copyright Copyright 2020, Cake Development Corporation (https://www.cakedc.com)
+ * @license   MIT License (http://www.opensource.org/licenses/mit-license.php)
+ */
+
+namespace CakeDC\PHPStan\Type;
+
+use Cake\Database\TypeFactory;
+use PhpParser\Node\Expr\StaticCall;
+use PHPStan\Analyser\Scope;
+use PHPStan\Reflection\MethodReflection;
+use PHPStan\Type\DynamicStaticMethodReturnTypeExtension;
+use PHPStan\Type\ObjectType;
+use PHPStan\Type\Type;
+use ReflectionClass;
+use ReflectionException;
+
+/**
+ * Provides return type for TypeFactory::build() based on the type name argument.
+ *
+ * This allows PHPStan to understand that TypeFactory::build('datetime') returns
+ * a DateTimeType instance with its specific methods like setUserTimezone().
+ */
+class TypeFactoryBuildDynamicReturnTypeExtension implements DynamicStaticMethodReturnTypeExtension
+{
+    /**
+     * @var array<string, class-string>|null
+     */
+    private ?array $typeMap = null;
+
+    /**
+     * @return class-string
+     */
+    public function getClass(): string
+    {
+        return TypeFactory::class;
+    }
+
+    /**
+     * Checks if the method is supported.
+     *
+     * @param \PHPStan\Reflection\MethodReflection $methodReflection Method reflection
+     * @return bool
+     */
+    public function isStaticMethodSupported(MethodReflection $methodReflection): bool
+    {
+        return $methodReflection->getName() === 'build';
+    }
+
+    /**
+     * Returns the type from the static method call.
+     *
+     * @param \PHPStan\Reflection\MethodReflection $methodReflection Method reflection
+     * @param \PhpParser\Node\Expr\StaticCall $methodCall Static method call
+     * @param \PHPStan\Analyser\Scope $scope Scope
+     * @return \PHPStan\Type\Type|null
+     */
+    public function getTypeFromStaticMethodCall(
+        MethodReflection $methodReflection,
+        StaticCall $methodCall,
+        Scope $scope,
+    ): ?Type {
+        $args = $methodCall->getArgs();
+        if (count($args) === 0) {
+            return null;
+        }
+
+        $argType = $scope->getType($args[0]->value);
+        $constantStrings = $argType->getConstantStrings();
+        if (count($constantStrings) !== 1) {
+            return null;
+        }
+
+        $typeName = $constantStrings[0]->getValue();
+        $typeMap = $this->getTypeMap();
+
+        if (!isset($typeMap[$typeName])) {
+            return null;
+        }
+
+        return new ObjectType($typeMap[$typeName]);
+    }
+
+    /**
+     * Get the type map by reading TypeFactory's static property via reflection.
+     * This is cached after the first call.
+     *
+     * @return array<string, class-string>
+     */
+    private function getTypeMap(): array
+    {
+        if ($this->typeMap !== null) {
+            return $this->typeMap;
+        }
+
+        try {
+            $reflection = new ReflectionClass(TypeFactory::class);
+            $property = $reflection->getProperty('_types');
+            $property->setAccessible(true);
+
+            /** @var array<string, class-string> $defaultValue */
+            $defaultValue = $property->getDefaultValue();
+            $this->typeMap = $defaultValue;
+
+            return $this->typeMap;
+        } catch (ReflectionException $e) {
+            return [];
+        }
+    }
+}

tests/TestCase/Type/Fake/TypeFactoryCorrectUsage.php

@@ -0,0 +1,45 @@
+<?php
+declare(strict_types=1);
+
+namespace CakeDC\PHPStan\Test\TestCase\Type\Fake;
+
+use Cake\Database\TypeFactory;
+
+class TypeFactoryCorrectUsage
+{
+    public function testDateTimeTypeWithSetUserTimezone(): void
+    {
+        $type = TypeFactory::build('datetime');
+        $type->setUserTimezone('America/New_York');
+    }
+
+    public function testTimestampTypeWithSetUserTimezone(): void
+    {
+        $type = TypeFactory::build('timestamp');
+        $type->setUserTimezone('UTC');
+    }
+
+    public function testDateTimeFractionalTypeWithSetUserTimezone(): void
+    {
+        $type = TypeFactory::build('datetimefractional');
+        $type->setUserTimezone('UTC');
+    }
+
+    public function testDateTimeTimezoneTypeWithSetUserTimezone(): void
+    {
+        $type = TypeFactory::build('timestamptimezone');
+        $type->setUserTimezone('UTC');
+    }
+
+    public function testDateTypeWithSetLocaleFormat(): void
+    {
+        $type = TypeFactory::build('date');
+        $type->setLocaleFormat('yyyy-MM-dd');
+    }
+
+    public function testTimeTypeWithSetLocaleFormat(): void
+    {
+        $type = TypeFactory::build('time');
+        $type->setLocaleFormat('HH:mm:ss');
+    }
+}

tests/TestCase/Type/Fake/TypeFactoryIncorrectUsage.php

@@ -0,0 +1,33 @@
+<?php
+declare(strict_types=1);
+
+namespace CakeDC\PHPStan\Test\TestCase\Type\Fake;
+
+use Cake\Database\TypeFactory;
+
+class TypeFactoryIncorrectUsage
+{
+    public function testIntegerTypeWithSetUserTimezone(): void
+    {
+        $type = TypeFactory::build('integer');
+        $type->setUserTimezone('UTC');
+    }
+
+    public function testStringTypeWithSetUserTimezone(): void
+    {
+        $type = TypeFactory::build('string');
+        $type->setUserTimezone('UTC');
+    }
+
+    public function testBoolTypeWithSetUserTimezone(): void
+    {
+        $type = TypeFactory::build('boolean');
+        $type->setUserTimezone('UTC');
+    }
+
+    public function testJsonTypeWithNonExistentMethod(): void
+    {
+        $type = TypeFactory::build('json');
+        $type->nonExistentMethod();
+    }
+}

tests/TestCase/Type/TypeFactoryBuildDynamicReturnTypeExtensionTest.php

@@ -0,0 +1,67 @@
+<?php
+declare(strict_types=1);
+
+/**
+ * Copyright 2025, Cake Development Corporation (https://www.cakedc.com)
+ *
+ * Licensed under The MIT License
+ * Redistributions of files must retain the above copyright notice.
+ *
+ * @copyright Copyright 2025, Cake Development Corporation (https://www.cakedc.com)
+ * @license   MIT License (http://www.opensource.org/licenses/mit-license.php)
+ */
+
+namespace CakeDC\PHPStan\Test\TestCase\Type;
+
+use PHPUnit\Framework\TestCase;
+
+class TypeFactoryBuildDynamicReturnTypeExtensionTest extends TestCase
+{
+    /**
+     * Test that TypeFactory::build() returns correct types and allows valid method calls.
+     *
+     * @return void
+     */
+    public function testTypeFactoryBuildReturnsCorrectTypes(): void
+    {
+        $output = $this->runPhpStan(__DIR__ . '/Fake/TypeFactoryCorrectUsage.php');
+        $this->assertStringContainsString('[OK] No errors', $output);
+    }
+
+    /**
+     * Test that TypeFactory::build() catches invalid method calls.
+     *
+     * @return void
+     */
+    public function testTypeFactoryBuildCatchesInvalidMethodCalls(): void
+    {
+        $output = $this->runPhpStan(__DIR__ . '/Fake/TypeFactoryIncorrectUsage.php');
+
+        $this->assertStringContainsString('IntegerType::setUserTimezone()', $output);
+        $this->assertStringContainsString('StringType::setUserTimezone()', $output);
+        $this->assertStringContainsString('BoolType::setUserTimezone()', $output);
+        $this->assertStringContainsString('JsonType::nonExistentMethod()', $output);
+        $this->assertStringContainsString('Found 4 errors', $output);
+    }
+
+    /**
+     * Run PHPStan on a file and return the output.
+     *
+     * @param string $file File to analyze
+     * @return string
+     */
+    private function runPhpStan(string $file): string
+    {
+        $configFile = dirname(__DIR__, 3) . '/extension.neon';
+        $command = sprintf(
+            'cd %s && vendor/bin/phpstan analyze %s --level=max --configuration=%s --no-progress 2>&1',
+            escapeshellarg(dirname(__DIR__, 3)),
+            escapeshellarg($file),
+            escapeshellarg($configFile),
+        );
+
+        exec($command, $output, $exitCode);
+
+        return implode("\n", $output);
+    }
+}