code: function indexationOption() {
      return new Promise((resolve, reject) => {
          logger_1.logger.log('info', `Starting indexation...`);
          indexation(configContent.previousCacheDir)
              .on('indexDone', () => {
              logger_1.logger.log('success', `Indexation done\n`);
              resolve();
          })
              .on('indexError', (err) => {
              logger_1.logger.log('error', `${err}`);
              reject(err);
          });
      });
  }
docs: /*
  function indexationOption that return a Promise object. This function will be called
  if the "-i" option given in command line. Starting the indexation of the
  cache dir path given is ./config.json file.