//// [protectedClassPropertyAccessibleWithinSubclass3.ts] class Base { protected x: string; method() { this.x; // OK, accessed within their declaring class } } class Derived extends Base { method1() { this.x; // OK, accessed within a subclass of the declaring class super.x; // Error, x is not public } } //// [protectedClassPropertyAccessibleWithinSubclass3.js] var __extends = (this && this.__extends) || function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; function __() { this.constructor = d; } d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __()); }; var Base = (function () { function Base() { } Base.prototype.method = function () { this.x; // OK, accessed within their declaring class }; return Base; })(); var Derived = (function (_super) { __extends(Derived, _super); function Derived() { _super.apply(this, arguments); } Derived.prototype.method1 = function () { this.x; // OK, accessed within a subclass of the declaring class _super.prototype.x; // Error, x is not public }; return Derived; })(Base);