var _a, _a2, _a2$b, _a2$b$c;

(_a = a) == null ? void 0 : delete _a.b;

(_a2 = a) == null ? void 0 : (_a2$b = _a2.b) == null ? void 0 : (_a2$b$c = _a2$b.c) == null ? void 0 : delete _a2$b$c.d;