diff --git a/README.md b/README.md
index 5e8ffc3..c5e349f 100644
--- a/README.md
+++ b/README.md
@@ -404,3 +404,94 @@ final class Alert
 :+1:
 
 <br>
+
+### PreMountMethodSignatureRule
+
+Enforces that methods with the `#[PreMount]` attribute have the correct signature: they must be public and have exactly one parameter of type `array`, with a return type of `array`.
+This ensures proper integration with the Symfony UX TwigComponent lifecycle hooks.
+
+```yaml
+rules:
+    - Kocal\PHPStanSymfonyUX\Rules\TwigComponent\PreMountMethodSignatureRule
+```
+
+```php
+// src/Twig/Components/Alert.php
+namespace App\Twig\Components;
+
+use Symfony\UX\TwigComponent\Attribute\AsTwigComponent;
+use Symfony\UX\TwigComponent\Attribute\PreMount;
+
+#[AsTwigComponent]
+final class Alert
+{
+    #[PreMount]
+    protected function preMount(array $data): array
+    {
+        return $data;
+    }
+}
+```
+
+```php
+// src/Twig/Components/Alert.php
+namespace App\Twig\Components;
+
+use Symfony\UX\TwigComponent\Attribute\AsTwigComponent;
+use Symfony\UX\TwigComponent\Attribute\PreMount;
+
+#[AsTwigComponent]
+final class Alert
+{
+    #[PreMount]
+    public function preMount(array $data): void
+    {
+    }
+}
+```
+
+```php
+// src/Twig/Components/Alert.php
+namespace App\Twig\Components;
+
+use Symfony\UX\TwigComponent\Attribute\AsTwigComponent;
+use Symfony\UX\TwigComponent\Attribute\PreMount;
+
+#[AsTwigComponent]
+final class Alert
+{
+    #[PreMount]
+    public function preMount(string $data): array
+    {
+        return [];
+    }
+}
+```
+
+:x:
+
+<br>
+
+```php
+// src/Twig/Components/Alert.php
+namespace App\Twig\Components;
+
+use Symfony\UX\TwigComponent\Attribute\AsTwigComponent;
+use Symfony\UX\TwigComponent\Attribute\PreMount;
+
+#[AsTwigComponent]
+final class Alert
+{
+    #[PreMount]
+    public function preMount(array $data): array
+    {
+        $data['timestamp'] = time();
+
+        return $data;
+    }
+}
+```
+
+:+1:
+
+<br>
diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
deleted file mode 100644
index 42b264f..0000000
--- a/phpstan-baseline.neon
+++ /dev/null
@@ -1,25 +0,0 @@
-parameters:
-	ignoreErrors:
-		-
-			message: '#^Property Kocal\\PHPStanSymfonyUX\\Tests\\Rules\\TwigComponent\\PublicPropertiesShouldBeCamelCaseRule\\Fixture\\ComponentWithPrivateNonCamelCaseProperties\:\:\$is_active is unused\.$#'
-			identifier: property.unused
-			count: 1
-			path: tests/Rules/TwigComponent/PublicPropertiesShouldBeCamelCaseRule/Fixture/ComponentWithPrivateNonCamelCaseProperties.php
-
-		-
-			message: '#^Property Kocal\\PHPStanSymfonyUX\\Tests\\Rules\\TwigComponent\\PublicPropertiesShouldBeCamelCaseRule\\Fixture\\ComponentWithPrivateNonCamelCaseProperties\:\:\$user_name is unused\.$#'
-			identifier: property.unused
-			count: 1
-			path: tests/Rules/TwigComponent/PublicPropertiesShouldBeCamelCaseRule/Fixture/ComponentWithPrivateNonCamelCaseProperties.php
-
-		-
-			message: '#^Method Kocal\\PHPStanSymfonyUX\\Tests\\Rules\\TwigComponent\\MethodsShouldBePublicOrPrivateRule\\Fixture\\ComponentWithPublicAndPrivateMethods\:\:privateMethod\(\) is unused\.$#'
-			identifier: method.unused
-			count: 1
-			path: tests/Rules/TwigComponent/MethodsShouldBePublicOrPrivateRule/Fixture/ComponentWithPublicAndPrivateMethods.php
-
-		-
-			message: '#^Method Kocal\\PHPStanSymfonyUX\\Tests\\Rules\\TwigComponent\\MethodsShouldBePublicOrPrivateRule\\Fixture\\LiveComponentWithPublicAndPrivateMethods\:\:privateMethod\(\) is unused\.$#'
-			identifier: method.unused
-			count: 1
-			path: tests/Rules/TwigComponent/MethodsShouldBePublicOrPrivateRule/Fixture/LiveComponentWithPublicAndPrivateMethods.php
diff --git a/phpstan.dist.neon b/phpstan.dist.neon
index ea25a23..e786f4c 100644
--- a/phpstan.dist.neon
+++ b/phpstan.dist.neon
@@ -1,9 +1,17 @@
-includes:
-    - ./phpstan-baseline.neon
-
 parameters:
     level: max
 
     paths:
         - src
         - tests
+
+    ignoreErrors:
+        -
+            paths:
+                - tests/**/Fixture/*
+            identifiers:
+                - method.unused
+                - missingType.iterableValue
+                - missingType.return
+                - property.unused
+                - return.unusedType
\ No newline at end of file
diff --git a/src/Rules/TwigComponent/PreMountMethodSignatureRule.php b/src/Rules/TwigComponent/PreMountMethodSignatureRule.php
new file mode 100644
index 0000000..4543c34
--- /dev/null
+++ b/src/Rules/TwigComponent/PreMountMethodSignatureRule.php
@@ -0,0 +1,115 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kocal\PHPStanSymfonyUX\Rules\TwigComponent;
+
+use Kocal\PHPStanSymfonyUX\NodeAnalyzer\AttributeFinder;
+use PhpParser\Node;
+use PhpParser\Node\Stmt\Class_;
+use PHPStan\Analyser\Scope;
+use PHPStan\Rules\Rule;
+use PHPStan\Rules\RuleErrorBuilder;
+use Symfony\UX\LiveComponent\Attribute\AsLiveComponent;
+use Symfony\UX\TwigComponent\Attribute\AsTwigComponent;
+use Symfony\UX\TwigComponent\Attribute\PreMount;
+
+/**
+ * @implements Rule<Class_>
+ */
+final class PreMountMethodSignatureRule implements Rule
+{
+    public function getNodeType(): string
+    {
+        return Class_::class;
+    }
+
+    public function processNode(Node $node, Scope $scope): array
+    {
+        if (! AttributeFinder::findAnyAttribute($node, [AsTwigComponent::class, AsLiveComponent::class])) {
+            return [];
+        }
+
+        $errors = [];
+
+        foreach ($node->getMethods() as $method) {
+            // Check if the method has the PreMount attribute
+            if (! AttributeFinder::findAttribute($method, PreMount::class)) {
+                continue;
+            }
+
+            $errors = array_merge($errors, $this->validatePreMountMethod($method));
+        }
+
+        return $errors;
+    }
+
+    /**
+     * @return list<\PHPStan\Rules\IdentifierRuleError>
+     */
+    private function validatePreMountMethod(Node\Stmt\ClassMethod $node): array
+    {
+        $errors = [];
+
+        // Check if the method is public
+        if (! $node->isPublic()) {
+            $errors[] = RuleErrorBuilder::message(
+                sprintf('Method "%s" with #[PreMount] attribute must be public.', $node->name->toString())
+            )
+                ->identifier('symfonyUX.twigComponent.preMountMethodMustBePublic')
+                ->line($node->getLine())
+                ->tip('Change the method visibility to public.')
+                ->build();
+        }
+
+        // Check the return type
+        $returnType = $node->getReturnType();
+        if ($returnType === null) {
+            $errors[] = RuleErrorBuilder::message(
+                sprintf('Method "%s" with #[PreMount] attribute must have a return type of "array".', $node->name->toString())
+            )
+                ->identifier('symfonyUX.twigComponent.preMountMethodMissingReturnType')
+                ->line($node->getLine())
+                ->tip('Add ": array" return type to the method.')
+                ->build();
+        } else {
+            $isValidReturnType = $returnType instanceof Node\Identifier && $returnType->toString() === 'array';
+
+            if (! $isValidReturnType) {
+                $errors[] = RuleErrorBuilder::message(
+                    sprintf('Method "%s" with #[PreMount] attribute must have a return type of "array".', $node->name->toString())
+                )
+                    ->identifier('symfonyUX.twigComponent.preMountMethodInvalidReturnType')
+                    ->line($returnType->getLine())
+                    ->tip('Change the return type to ": array".')
+                    ->build();
+            }
+        }
+
+        // Check that there is exactly one parameter of type array
+        if (count($node->params) !== 1) {
+            $errors[] = RuleErrorBuilder::message(
+                sprintf('Method "%s" with #[PreMount] attribute must have exactly one parameter of type "array".', $node->name->toString())
+            )
+                ->identifier('symfonyUX.twigComponent.preMountMethodInvalidParameterCount')
+                ->line($node->getLine())
+                ->tip('The method should have exactly one parameter: "array $data".')
+                ->build();
+        } else {
+            $param = $node->params[0];
+            $paramType = $param->type;
+
+            if (! $paramType instanceof Node\Identifier || $paramType->toString() !== 'array') {
+                $errors[] = RuleErrorBuilder::message(
+                    sprintf('Method "%s" with #[PreMount] attribute must have a parameter of type "array".', $node->name->toString())
+                )
+                    ->identifier('symfonyUX.twigComponent.preMountMethodInvalidParameterType')
+                    ->line($param->getLine())
+                    ->tip('Change the parameter type to "array".')
+                    ->build();
+            }
+        }
+
+        return $errors;
+    }
+}
diff --git a/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidNoParameter.php b/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidNoParameter.php
new file mode 100644
index 0000000..301e101
--- /dev/null
+++ b/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidNoParameter.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kocal\PHPStanSymfonyUX\Tests\Rules\TwigComponent\PreMountMethodSignatureRule\Fixture;
+
+use Symfony\UX\TwigComponent\Attribute\AsTwigComponent;
+use Symfony\UX\TwigComponent\Attribute\PreMount;
+
+#[AsTwigComponent]
+final class InvalidNoParameter
+{
+    #[PreMount]
+    public function preMount(): array
+    {
+        return [];
+    }
+}
diff --git a/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidNoReturnType.php b/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidNoReturnType.php
new file mode 100644
index 0000000..32c1717
--- /dev/null
+++ b/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidNoReturnType.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kocal\PHPStanSymfonyUX\Tests\Rules\TwigComponent\PreMountMethodSignatureRule\Fixture;
+
+use Symfony\UX\TwigComponent\Attribute\AsTwigComponent;
+use Symfony\UX\TwigComponent\Attribute\PreMount;
+
+#[AsTwigComponent]
+final class InvalidNoReturnType
+{
+    #[PreMount]
+    public function preMount(array $data)
+    {
+        return $data;
+    }
+}
diff --git a/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidNotPublic.php b/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidNotPublic.php
new file mode 100644
index 0000000..d47fff8
--- /dev/null
+++ b/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidNotPublic.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kocal\PHPStanSymfonyUX\Tests\Rules\TwigComponent\PreMountMethodSignatureRule\Fixture;
+
+use Symfony\UX\TwigComponent\Attribute\AsTwigComponent;
+use Symfony\UX\TwigComponent\Attribute\PreMount;
+
+#[AsTwigComponent]
+final class InvalidNotPublic
+{
+    #[PreMount]
+    private function preMount(array $data): array
+    {
+        return $data;
+    }
+}
diff --git a/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidTooManyParameters.php b/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidTooManyParameters.php
new file mode 100644
index 0000000..d568a93
--- /dev/null
+++ b/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidTooManyParameters.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kocal\PHPStanSymfonyUX\Tests\Rules\TwigComponent\PreMountMethodSignatureRule\Fixture;
+
+use Symfony\UX\TwigComponent\Attribute\AsTwigComponent;
+use Symfony\UX\TwigComponent\Attribute\PreMount;
+
+#[AsTwigComponent]
+final class InvalidTooManyParameters
+{
+    #[PreMount]
+    public function preMount(array $data, string $extra): array
+    {
+        return $data;
+    }
+}
diff --git a/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidWithNullableReturnType.php b/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidWithNullableReturnType.php
new file mode 100644
index 0000000..6d92be0
--- /dev/null
+++ b/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidWithNullableReturnType.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kocal\PHPStanSymfonyUX\Tests\Rules\TwigComponent\PreMountMethodSignatureRule\Fixture;
+
+use Symfony\UX\TwigComponent\Attribute\AsTwigComponent;
+use Symfony\UX\TwigComponent\Attribute\PreMount;
+
+#[AsTwigComponent]
+final class InvalidWithNullableReturnType
+{
+    #[PreMount]
+    public function preMount(array $data): ?array
+    {
+        return $data;
+    }
+}
diff --git a/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidWrongParameterType.php b/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidWrongParameterType.php
new file mode 100644
index 0000000..6e5ab45
--- /dev/null
+++ b/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidWrongParameterType.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kocal\PHPStanSymfonyUX\Tests\Rules\TwigComponent\PreMountMethodSignatureRule\Fixture;
+
+use Symfony\UX\TwigComponent\Attribute\AsTwigComponent;
+use Symfony\UX\TwigComponent\Attribute\PreMount;
+
+#[AsTwigComponent]
+final class InvalidWrongParameterType
+{
+    #[PreMount]
+    public function preMount(string $data): array
+    {
+        return [];
+    }
+}
diff --git a/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidWrongReturnType.php b/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidWrongReturnType.php
new file mode 100644
index 0000000..f60f940
--- /dev/null
+++ b/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/InvalidWrongReturnType.php
@@ -0,0 +1,17 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kocal\PHPStanSymfonyUX\Tests\Rules\TwigComponent\PreMountMethodSignatureRule\Fixture;
+
+use Symfony\UX\TwigComponent\Attribute\AsTwigComponent;
+use Symfony\UX\TwigComponent\Attribute\PreMount;
+
+#[AsTwigComponent]
+final class InvalidWrongReturnType
+{
+    #[PreMount]
+    public function preMount(array $data): void
+    {
+    }
+}
diff --git a/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/NotAComponent.php b/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/NotAComponent.php
new file mode 100644
index 0000000..02ab6c4
--- /dev/null
+++ b/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/NotAComponent.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kocal\PHPStanSymfonyUX\Tests\Rules\TwigComponent\PreMountMethodSignatureRule\Fixture;
+
+use Symfony\UX\TwigComponent\Attribute\PreMount;
+
+final class NotAComponent
+{
+    #[PreMount]
+    public function preMount(array $data): array
+    {
+        return $data;
+    }
+}
diff --git a/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/ValidLiveComponent.php b/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/ValidLiveComponent.php
new file mode 100644
index 0000000..a8a073f
--- /dev/null
+++ b/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/ValidLiveComponent.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kocal\PHPStanSymfonyUX\Tests\Rules\TwigComponent\PreMountMethodSignatureRule\Fixture;
+
+use Symfony\UX\LiveComponent\Attribute\AsLiveComponent;
+use Symfony\UX\TwigComponent\Attribute\PreMount;
+
+#[AsLiveComponent]
+final class ValidLiveComponent
+{
+    #[PreMount]
+    public function preMount(array $data): array
+    {
+        return $data;
+    }
+}
diff --git a/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/ValidTwigComponent.php b/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/ValidTwigComponent.php
new file mode 100644
index 0000000..5fee538
--- /dev/null
+++ b/tests/Rules/TwigComponent/PreMountMethodSignatureRule/Fixture/ValidTwigComponent.php
@@ -0,0 +1,18 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kocal\PHPStanSymfonyUX\Tests\Rules\TwigComponent\PreMountMethodSignatureRule\Fixture;
+
+use Symfony\UX\TwigComponent\Attribute\AsTwigComponent;
+use Symfony\UX\TwigComponent\Attribute\PreMount;
+
+#[AsTwigComponent]
+final class ValidTwigComponent
+{
+    #[PreMount]
+    public function preMount(array $data): array
+    {
+        return $data;
+    }
+}
diff --git a/tests/Rules/TwigComponent/PreMountMethodSignatureRule/PreMountMethodSignatureRuleTest.php b/tests/Rules/TwigComponent/PreMountMethodSignatureRule/PreMountMethodSignatureRuleTest.php
new file mode 100644
index 0000000..1a654fc
--- /dev/null
+++ b/tests/Rules/TwigComponent/PreMountMethodSignatureRule/PreMountMethodSignatureRuleTest.php
@@ -0,0 +1,123 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Kocal\PHPStanSymfonyUX\Tests\Rules\TwigComponent\PreMountMethodSignatureRule;
+
+use Kocal\PHPStanSymfonyUX\Rules\TwigComponent\PreMountMethodSignatureRule;
+use PHPStan\Rules\Rule;
+use PHPStan\Testing\RuleTestCase;
+
+/**
+ * @extends RuleTestCase<PreMountMethodSignatureRule>
+ */
+final class PreMountMethodSignatureRuleTest extends RuleTestCase
+{
+    public function testViolations(): void
+    {
+        $this->analyse(
+            [__DIR__ . '/Fixture/InvalidNotPublic.php'],
+            [
+                [
+                    'Method "preMount" with #[PreMount] attribute must be public.',
+                    13,
+                    'Change the method visibility to public.',
+                ],
+            ]
+        );
+
+        $this->analyse(
+            [__DIR__ . '/Fixture/InvalidNoReturnType.php'],
+            [
+                [
+                    'Method "preMount" with #[PreMount] attribute must have a return type of "array".',
+                    13,
+                    'Add ": array" return type to the method.',
+                ],
+            ]
+        );
+
+        $this->analyse(
+            [__DIR__ . '/Fixture/InvalidWrongReturnType.php'],
+            [
+                [
+                    'Method "preMount" with #[PreMount] attribute must have a return type of "array".',
+                    14,
+                    'Change the return type to ": array".',
+                ],
+            ]
+        );
+
+        $this->analyse(
+            [__DIR__ . '/Fixture/InvalidNoParameter.php'],
+            [
+                [
+                    'Method "preMount" with #[PreMount] attribute must have exactly one parameter of type "array".',
+                    13,
+                    'The method should have exactly one parameter: "array $data".',
+                ],
+            ]
+        );
+
+        $this->analyse(
+            [__DIR__ . '/Fixture/InvalidTooManyParameters.php'],
+            [
+                [
+                    'Method "preMount" with #[PreMount] attribute must have exactly one parameter of type "array".',
+                    13,
+                    'The method should have exactly one parameter: "array $data".',
+                ],
+            ]
+        );
+
+        $this->analyse(
+            [__DIR__ . '/Fixture/InvalidWithNullableReturnType.php'],
+            [
+                [
+                    'Method "preMount" with #[PreMount] attribute must have a return type of "array".',
+                    14,
+                    'Change the return type to ": array".',
+                ],
+            ]
+        );
+
+        $this->analyse(
+            [__DIR__ . '/Fixture/InvalidWrongParameterType.php'],
+            [
+                [
+                    'Method "preMount" with #[PreMount] attribute must have a parameter of type "array".',
+                    14,
+                    'Change the parameter type to "array".',
+                ],
+            ]
+        );
+    }
+
+    public function testNoViolations(): void
+    {
+        $this->analyse(
+            [__DIR__ . '/Fixture/NotAComponent.php'],
+            []
+        );
+
+        $this->analyse(
+            [__DIR__ . '/Fixture/ValidTwigComponent.php'],
+            []
+        );
+
+        $this->analyse(
+            [__DIR__ . '/Fixture/ValidLiveComponent.php'],
+            []
+        );
+    }
+
+    public static function getAdditionalConfigFiles(): array
+    {
+        return [__DIR__ . '/config/configured_rule.neon'];
+    }
+
+    protected function getRule(): Rule
+    {
+        return self::getContainer()->getByType(PreMountMethodSignatureRule::class);
+    }
+}
diff --git a/tests/Rules/TwigComponent/PreMountMethodSignatureRule/config/configured_rule.neon b/tests/Rules/TwigComponent/PreMountMethodSignatureRule/config/configured_rule.neon
new file mode 100644
index 0000000..defbfce
--- /dev/null
+++ b/tests/Rules/TwigComponent/PreMountMethodSignatureRule/config/configured_rule.neon
@@ -0,0 +1,2 @@
+rules:
+    - Kocal\PHPStanSymfonyUX\Rules\TwigComponent\PreMountMethodSignatureRule