testDirectProxyGetOwnPropertyNames7.js

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load(libdir + "asserts.js");

/*

 * Throw a TypeError if the trap skips an existing own property on a

 * non-extensible object

*/

var target = {};

Object.defineProperty(target, 'foo', {

    configurable: true

});

Object.preventExtensions(target);

var handler = { ownKeys: () => [] };

for (let p of [new Proxy(target, handler), Proxy.revocable(target, handler).proxy])

    assertThrowsInstanceOf(() => Object.getOwnPropertyNames(p), TypeError);