code: function promisifyAll(obj, options) {
    if (!obj) {
      // This object could be anything, including a function, a real object, or an array.
      throw new TypeError('promisify.all requires a truthy value');
    }
  
    const out = {};
  
    for (var name in obj) {
      if (typeof obj[name] === 'function') {
        out[name] = promisify(obj[name].bind(obj), options);
      }
    }
  
    return out;
  }
docs: Promisify all functions on the given object.
  
  @param {*} obj A value that can have properties.
  @param {Boolean|String[]} options.variadic See the documentation for promisify.
  @return {Object} The promisified object.