erroneous expect type 'string' found 'void' about vscode-intelephense HOT 2 CLOSED

public function __toString() {
    if(!is_null($this->rawData)) {
        return $this->rawData
    }
    
    // If the condition above doesn't match, there is no backup return clause,
    // potentially resulting in a return of :void.

}

$this->assertStringContainsString(
  'This is the help message', 
  (string) $txt // This turns even void or null to empty string so this is where I based my guess
);

public function __toString() {
    if(!is_null($this->rawData)) {
        return $this->rawData
    }
    
   return 'There were nothing to turn to string..!';
}