code: function check(packages, opt) {
      let deps = [];
      const pkgJson = (opt) ? findPackageJson(opt.startDir) : findPackageJson();
      let fileJson;
  
      if (!pkgJson) {
          throw new Error("Could not find a package.json file. Run 'npm init' to create one.");
      }
  
      try {
          fileJson = JSON.parse(fs.readFileSync(pkgJson, "utf8"));
      } catch (e) {
          const error = new Error(e);
  
          error.messageTemplate = "failed-to-read-json";
          error.messageData = {
              path: pkgJson,
              message: e.message
          };
          throw error;
      }
  
      if (opt.devDependencies && typeof fileJson.devDependencies === "object") {
          deps = deps.concat(Object.keys(fileJson.devDependencies));
      }
      if (opt.dependencies && typeof fileJson.dependencies === "object") {
          deps = deps.concat(Object.keys(fileJson.dependencies));
      }
      return packages.reduce((status, pkg) => {
          status[pkg] = deps.indexOf(pkg) !== -1;
          return status;
      }, {});
  }
docs: Check whether node modules are include in a project's package.json.
  
  @param   {string[]} packages           Array of node module names
  @param   {Object}  opt                 Options Object
  @param   {boolean} opt.dependencies    Set to true to check for direct dependencies
  @param   {boolean} opt.devDependencies Set to true to check for development dependencies
  @param   {boolean} opt.startdir        Directory to begin searching from
  @returns {Object}                      An object whose keys are the module names
  and values are booleans indicating installation.