lib/index.esm.js
function autobind(obj, prop, descriptor) {
  if (arguments.length === 1) return autobindClass()(obj);

  var _ref = descriptor || {},
      fn = _ref.value,
      configurable = _ref.configurable;

  if (!isFunction(fn)) {
    throw new TypeError('@autobind can only be used on functions, not "' + fn + '" in ' + (typeof fn === 'undefined' ? 'undefined' : _typeof(fn)) + ' on property "' + prop + '"');
  }
  var constructor = obj.constructor;

  return {
    configurable: configurable,
    enumerable: false,
    get: function get() {
      var _this = this;

      var boundFn = function boundFn() {
        for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
          args[_key] = arguments[_key];
        }

        return fn.call.apply(fn, [_this].concat(_toConsumableArray(args)));
      };
      // Someone accesses the property directly on the prototype on which it is
      // actually defined on, i.e. Class.prototype.hasOwnProperty(key)
      if (this === obj) {
        return fn;
      }
      // Someone accesses the property directly on a prototype,
      // but it was found up the chain, not defined directly on it
      // i.e. Class.prototype.hasOwnProperty(key) == false && key in Class.prototype
      if (this.constructor !== constructor && _Object$getPrototypeOf(this).constructor === constructor) {
        return fn;
      }

      // Autobound method calling super.sameMethod() which is also autobound and so on.
      if (this.constructor !== constructor && prop in this.constructor.prototype) {
        return getBoundSuper(this, fn);
      }
      _Object$defineProperty(this, prop, {
        configurable: true,
        writable: true,
        // NOT enumerable when it's a bound method
        enumerable: false,
        value: boundFn
      });

      return boundFn;
    },

    set: createDefaultSetter(prop)
  };
}
function autobind(obj, prop, descriptor) {
  if (arguments.length === 1) return autobindClass()(obj);

  var _ref = descriptor || {},
      fn = _ref.value,
      configurable = _ref.configurable;

  if (!isFunction(fn)) {
    throw new TypeError('@autobind can only be used on functions, not "' + fn + '" in ' + (typeof fn === 'undefined' ? 'undefined' : _typeof(fn)) + ' on property "' + prop + '"');
  }
  var constructor = obj.constructor;

  return {
    configurable: configurable,
    enumerable: false,
    get: function get() {
      var _this = this;

      var boundFn = function boundFn() {
        for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
          args[_key] = arguments[_key];
        }

        return fn.call.apply(fn, [_this].concat(_toConsumableArray(args)));
      };
      // Someone accesses the property directly on the prototype on which it is
      // actually defined on, i.e. Class.prototype.hasOwnProperty(key)
      if (this === obj) {
        return fn;
      }
      // Someone accesses the property directly on a prototype,
      // but it was found up the chain, not defined directly on it
      // i.e. Class.prototype.hasOwnProperty(key) == false && key in Class.prototype
      if (this.constructor !== constructor && _Object$getPrototypeOf(this).constructor === constructor) {
        return fn;
      }

      // Autobound method calling super.sameMethod() which is also autobound and so on.
      if (this.constructor !== constructor && prop in this.constructor.prototype) {
        return getBoundSuper(this, fn);
      }
      _Object$defineProperty(this, prop, {
        configurable: true,
        writable: true,
        // NOT enumerable when it's a bound method
        enumerable: false,
        value: boundFn
      });

      return boundFn;
    },

    set: createDefaultSetter(prop)
  };
}
auto bind the function on the class, just support function
@param {Object} obj Target Object
@param {string} prop prop strong
@param {Object} descriptor