vendors/execa.js/detectShebang
    function detectShebang(parsed) {
      parsed.file = resolveCommand(parsed);
      const shebang = parsed.file && readShebang(parsed.file);
      if (shebang) {
        parsed.args.unshift(parsed.file);
        parsed.command = shebang;
        return resolveCommand(parsed);
      }
      return parsed.file;
    }