testDirectProxyKeys6.js

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load(libdir + "asserts.js");

// Throw a TypeError if the trap skips a non-configurable enumerable property

var target = {};

Object.defineProperty(target, 'foo', {

    enumerable: true,

    configurable: false

});

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

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

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