"use strict"; test("basic functionality", () => { [true, false, "foo", 123, 123n, null, undefined].forEach(primitive => { let description = `${typeof primitive} '${primitive}${ typeof primitive == "bigint" ? "n" : "" }'`; if (primitive == null) description = String(primitive); expect(() => { primitive.foo = "bar"; }).toThrowWithMessage(TypeError, `Cannot set property 'foo' of ${description}`); expect(() => { primitive[Symbol.hasInstance] = 123; }).toThrowWithMessage( TypeError, `Cannot set property 'Symbol(Symbol.hasInstance)' of ${description}` ); }); });