//// [instanceMemberInitialization.ts] class C { x = 1; } var c = new C(); c.x = 3; var c2 = new C(); var r = c.x === c2.x; //// [instanceMemberInitialization.js] var C = (function () { function C() { this.x = 1; } return C; })(); var c = new C(); c.x = 3; var c2 = new C(); var r = c.x === c2.x;