title: What is the return type of a method that returns Heredoc?
body: <p>I have some PHP code that looks like this:</p>
  <pre><code>class MyClass
  {
      public static function classPhpdoc($paramA)
      {
          return &lt;&lt;&lt;PHP
  /** @template-extends \\$baseClass */
  
  PHP;
      }
  }
  </code></pre>
  <p>It's basically a class with multiple methods that return Heredoc blocks.</p>
  <p>I'm using phpstan tool to validate the code and it's complaining that the methods have no return-type specified.</p>
  <p>My question is: what return type would be appropiate to specify in such cases? I was thinking either <code>string</code> or <code>mixed</code> but I'm not sure.</p>