code: public function get(string $path): string
      {
          if (! $this->isFile($path)) {
              throw new RuntimeException('File does not exist at path ' . $path);
          }
  
          return file_get_contents($path);
      }
docs: Get the contents of a file.
  
  @param  string $path
  
  @return string
  @throws \RuntimeException