psalm/tests/fixtures/stubs/class_alias.php

<?php
namespace ClassAliasStubTest;

class A
{
    /**
     * @var string
     */
    public $foo = 'hello';

    public function bar(string $s) : string
    {
        return $s . ' I’m here';
    }

    public static function bat() : void
    {
    }
}

interface I
{
}

class_alias('ClassAliasStubTest\\A', 'ClassAliasStubTest\\B');
class_alias(A::class, C::class);

$arr = [
    [A::class, D::class],
    [I::class, IAlias::class],
];

foreach ($arr as list($orig, $alias)) {
    // Psalm cannot reason about this in the loading step
    class_alias($orig, $alias);
}