The Tor Browser / file revision

 function f1(a, b) {

     return a + b;

 }

 assertEq(f1.toString(), "function f1(a, b) {\n    return a + b;\n}");

 assertEq(f1.toSource(), f1.toString());

 function f2(a, /* ))))pernicious comment */ b,

             c, // another comment((

             d) {}

 assertEq(f2.toString(), "function f2(a, /* ))))pernicious comment */ b,\n            c, // another comment((\n            d) {}");

 assertEq(decompileBody(f2), "");

 function f3() { }

 assertEq(f3.toString(), "function f3() { }");

 assertEq(decompileBody(f3), " ");