code: private function findMethod(array $classInfo, $name)
      {
          foreach ($this->nodeFetcher->foreachNodes($classInfo) as $stmtData) {
              $stmt = $stmtData['node'];
              if ($stmt instanceof ClassMethod && $stmt->name === $name) {
                  return $stmt;
              }
          }
  
          throw new \InvalidArgumentException(sprintf('method %s not found', $name));
      }
docs: @param ClassMethod $classInfo
  @param string      $name
  
  @throws \InvalidArgumentException
  
  @return \PhpParser\Node\Stmt\ClassMethod