Source code
Revision control
Copy as Markdown
Other Tools
load(libdir + "asserts.js");
/*
* Throw a TypeError if the trap returns a non-configurable descriptor for a
* non-existent property
*/
var handler = { getOwnPropertyDescriptor: () => ({ configurable: false }) };
for (let p of [new Proxy({}, handler), Proxy.revocable({}, handler).proxy])
assertThrowsInstanceOf(() => Object.getOwnPropertyDescriptor(p, 'foo'), TypeError);