Classes and prototypes in JavaScript.

class.babel.js

"use strict";

function _instanceof(left, right) { if (right != null && typeof Symbol !== "undefined" && right[Symbol.hasInstance]) { return !!right[Symbol.hasInstance](left); } else { return left instanceof right; } }

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

function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

var Foo = /*#__PURE__*/function () {
  function Foo() {
    _classCallCheck(this, Foo);
  }

  _createClass(Foo, [{
    key: "bar",
    value: function bar() {
      return 'bar';
    }
  }]);

  return Foo;
}();

class.js

class Foo {
  bar() {
    return 'bar'; 
  }
}

class.ts

class Foo {
  bar() {
    return 'bar'; 
  }
}

class.ts.js

"use strict";
var Foo = /** @class */ (function () {
    function Foo() {
    }
    Foo.prototype.bar = function () {
        return 'bar';
    };
    return Foo;
}());