code: function readOpt(option) {
      const prefix = `${option}=`;
  
      for (let i = 0, len = process.argv.length, arg; i < len; i++) {
          arg = process.argv[i];
  
          if (arg === option) {
              return process.argv[i+1];
          } else if (arg.indexOf(prefix) === 0) {
              return arg.substr(prefix.length);
          }
      }
  }
docs: Read long-option value from CLI arguments.
  @param {string} option
  @returns {string}