instanceof.internalTrait

Code example

<?php declare(strict_types = 1);

// In package vendor/some-library:

/** @internal */
trait InternalTrait
{
}

// In your code:

function doFoo(object $obj): void
{
	if ($obj instanceof InternalTrait) {
		// ...
	}
}

Why is it reported?

The instanceof check references a trait that is marked as @internal. Internal types are implementation details of their package and may change or be removed without notice. Code outside the package should not depend on them, even in type checks.

How to fix it

Use a public interface or class instead of the internal trait in the instanceof check:

 function doFoo(object $obj): void
 {
-	if ($obj instanceof InternalTrait) {
+	if ($obj instanceof PublicInterface) {
 		// ...
 	}
 }

If the library does not expose a suitable public type, consider requesting one from the library maintainers.