//// [extendNonClassSymbol1.ts] class A { foo() { } } var x = A; class C extends x { } // error, could not find symbol xs //// [extendNonClassSymbol1.js] var __extends = this.__extends || function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; function __() { this.constructor = d; } __.prototype = b.prototype; d.prototype = new __(); }; var A = (function () { function A() { } A.prototype.foo = function () { }; return A; })(); var x = A; var C = (function (_super) { __extends(C, _super); function C() { _super.apply(this, arguments); } return C; })(x); // error, could not find symbol xs