The Tor Browser / file revision

 // defineProperty throws if a getter or setter is neither undefined nor callable.

 load(libdir + "asserts.js");

 var g = newGlobal();

 var dbg = new Debugger;

 var gw = dbg.addDebuggee(g);

 for (let v of [null, false, 'bad', 0, 2.76, {}]) {

     assertThrowsInstanceOf(function () {

         gw.defineProperty("p", {configurable: true, get: v});

     }, TypeError);

     assertThrowsInstanceOf(function () {

         gw.defineProperty("p", {configurable: true, set: v});

     }, TypeError);

 }