testDirectProxySet8.js

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// Assigning to a proxy with no set handler calls the defineProperty handler

// when an existing inherited data property already exists.

var hits = 0;

var proto = {x: 1};

var t = Object.create(proto);

var p = new Proxy(t, {

    defineProperty(t, id, desc) { hits++; return true; }

});

p.x = 2;

assertEq(hits, 1);

assertEq(proto.x, 1);

assertEq(t.hasOwnProperty("x"), false);

// Same thing, but the receiver is a plain object inheriting from p:

var receiver = Object.create(p);

receiver.x = 2;

assertEq(hits, 1);

assertEq(t.hasOwnProperty("x"), false);

assertEq(receiver.hasOwnProperty("x"), true);

assertEq(receiver.x, 2);