///////////////////////////
// ES6 original
////////////////////////////
class A extends B {
  constructor(x) {
    this.x = x;
  }
  b() {return this.x};
}

////////////////////////////
// Bublé transpilation
////////////////////////////
var A = (function (B) {
  function A(x) {
    B.call(this, x);
    this.x = x;
  }

  A.prototype = Object.create( B && B.prototype );
  A.prototype.constructor = A;
  A.prototype.b = function b() {return this.x};

  return A;
}(B));

////////////////////////////
// Babel transpilation
////////////////////////////

"use strict";

var _createClass = function() {
    function defineProperties(target, props) {
        for (var i = 0; i < props.length; i++) {
            var descriptor = props[i];
            descriptor.enumerable = descriptor.enumerable || false;
            descriptor.configurable = true;
            if ("value" in descriptor) descriptor.writable = true;
            Object.defineProperty(target, descriptor.key, descriptor);
        }
    }
    return function(Constructor, protoProps, staticProps) {
        if (protoProps) defineProperties(Constructor.prototype, protoProps);
        if (staticProps) defineProperties(Constructor, staticProps);
        return Constructor;
    };
}();

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;
}

var A = function(_B) {
    _inherits(A, _B);

    function A(x) {
        _classCallCheck(this, A);

        var _this = _possibleConstructorReturn(this, Object.getPrototypeOf(A).call(this, x));

        _this.x = x;
        return _this;
    }

    _createClass(A, [{
        key: "b",
        value: function b() {
            return this.x;
        }
    }]);

    return A;
}(B);