tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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testDirectProxyOwnKeysSymbol.js (1158B)

      1 // Make sure that we can find own, enumerable symbols.
      2 var symbol = Symbol("bad");
      3 var symbol2 = Symbol("good");
      4 var proxy = new Proxy({}, {
      5    ownKeys() {
      6        return [symbol, symbol2];
      7    },
      8    getOwnPropertyDescriptor(target, name) {
      9        if (name == symbol)
     10            return {configurable: true, enumerable: false, value: {}};
     11        // Only this enumerable symbol should be defined.
     12        if (name == symbol2)
     13            return {configurable: true, enumerable: true, value: {}};
     14        assertEq(true, false);
     15    },
     16    get(target, name) {
     17        // Slightly confusing, but these are the descriptors that defineProperties
     18        // is going to define on the object.
     19        if (name == symbol)
     20            return {configurable: true, value: "bad"};
     21        if (name == symbol2)
     22            return {configurable: true, value: "good"};
     23        assertEq(true, false);
     24    }
     25 });
     26 assertEq(Object.getOwnPropertySymbols(proxy).length, 2);
     27 
     28 var obj = {};
     29 Object.defineProperties(obj, proxy);
     30 assertEq(Object.getOwnPropertySymbols(obj).length, 1);
     31 assertEq(symbol in obj, false);
     32 assertEq(symbol2 in obj, true);
     33 assertEq(obj[symbol2], "good");