Merge pull request #15994 from ralphjsmit/rjs/check-if-macro-exists

Ability to check if macro exists

packages/support/src/Concerns/Macroable.php

@@ -39,6 +39,11 @@ trait Macroable
         static::$macros = [];
     }
 
+    public static function hasMacro(string $name): bool
+    {
+        return (bool) static::getMacro($name);
+    }
+
     /**
      * @param  array<array-key>  $parameters
      */

tests/src/Support/MacroableTest.php

@@ -0,0 +1,28 @@
+<?php
+
+use Filament\Forms\ComponentContainer;
+use Filament\Forms\Components\Field;
+use Filament\Forms\Form;
+use Filament\Support\Components\Component;
+use Filament\Tests\TestCase;
+
+uses(TestCase::class);
+
+test('component is macroable', function () {
+    expect(ComponentContainer::hasMacro('someMacro'))
+        ->toBeFalse();
+
+    expect(ComponentContainer::hasMacro('someMacro'))
+        ->toBeFalse();
+
+    ComponentContainer::macro('someMacro', fn () => 'Hello');
+
+    expect(ComponentContainer::hasMacro('someMacro'))
+        ->toBeTrue();
+
+    expect(Form::hasMacro('someMacro'))
+        ->toBeTrue(); // Descendant of `Component`...
+
+    expect(Field::hasMacro('someMacro'))
+        ->toBeFalse();
+});