var _ref, _ref2, _; var inc = x => x + 1; var result = (_ref = 4 || 9, inc(_ref)); expect(result).toBe(5); var f = x => x + 10; var h = x => x + 20; var result2 = (_ref2 = (_ = 10, (f || h)(_)), inc(_ref2)); expect(result2).toBe(21);