//// [extendNonClassSymbol1.ts] class A { foo() { } } var x = A; class C extends x { } // error, could not find symbol xs //// [extendNonClassSymbol1.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 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