selfOut.internalTrait

Code example

<?php declare(strict_types = 1);

namespace Vendor {
	/** @internal */
	trait InternalTrait {}
}

namespace App {
	class Builder {
		/**
		 * @phpstan-self-out \Vendor\InternalTrait
		 */
		public function build(): void {}
	}
}

Why is it reported?

The @phpstan-self-out PHPDoc tag references a trait that is marked as @internal. Internal traits are not meant to be used outside the package that defines them.

Note: triggering this identifier requires using a trait in @phpstan-self-out, which is not a valid type. PHPStan therefore always also reports a selfOut.trait error alongside this one.

How to fix it

Replace the internal trait with a public interface or class:

 class Builder {
 	/**
-	 * @phpstan-self-out \Vendor\InternalTrait
+	 * @phpstan-self-out \Vendor\PublicInterface
 	 */
 	public function build(): void {}
 }

If the trait is internal to the same package, the error will not be reported. The @internal restriction only applies to cross-package usage.