js/src/jit-test/tests/proxy/testDirectProxyGetOwnPropertyNames4.js

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1 load(libdir + "asserts.js");
2
3 // Throw a TypeError if the trap reports the same property twice
4 assertThrowsInstanceOf(function () {
5 Object.getOwnPropertyNames(new Proxy({}, {
6 getOwnPropertyNames: function (target) {
7 return [ 'foo', 'foo' ];
8 }
9 }));
10 }, TypeError);

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