babel-autobind/lib/index.js

it binds methods to its class prototype + Compatible with stub/spy used on unit-test frameworks (Sinon.Js, enzyme,...so on) + Can be integrated with 3rd party decorators (like @autobind decorator)

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.Autobind = Autobind;

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

function Autobind(Mocked, ClassName) {
  if (typeof Mocked === 'string') {
    return function (target) {
      return Autobind(target, Mocked);
    };
  }
  var methods = Object.getOwnPropertyNames(Mocked.prototype);
  var getMethodProperty = function getMethodProperty(methodName, prop) {
    return Object.getOwnPropertyDescriptor(Mocked.prototype, methodName)[prop];
  };
  var methodsExcluded = ['constructor', 'render'];
  var ruleIncluder = function ruleIncluder(methodName) {
    return methodsExcluded.indexOf(methodName) < 0 && typeof getMethodProperty(methodName, 'value') === 'function';
  };

  var Mocker = function (_Mocked) {
    _inherits(Mocker, _Mocked);

    function Mocker() {
      _classCallCheck(this, Mocker);

      var _this = _possibleConstructorReturn(this, (Mocker.__proto__ || Object.getPrototypeOf(Mocker)).apply(this, arguments));

      methods.filter(ruleIncluder).forEach(function (methodName) {
        _this[methodName] = _this[methodName].bind(_this);
      });
      return _this;
    }

    return Mocker;
  }(Mocked);

  var rename = function () {
    Object.defineProperty(Mocker, 'name', {
      writable: true
    });
    Mocker.name = ClassName || Mocked.name || 'AutoBoundComponent';
    Object.defineProperty(Mocker, 'name', {
      writable: false
    });
  }();

  Object.keys(Mocked).forEach(function (staticAttribute) {
    Mocker[staticAttribute] = Mocked[staticAttribute];
  });

  return Mocker;
};