tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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non-syntactic-with-unscopables.js (505B)

      1 // Tests evaluate's supportUnscopables option.
      2 function test(supportUnscopables) {
      3    var env = {x: 1, y: 2};
      4    Object.defineProperty(env, Symbol.unscopables, {get: function() {
      5        assertEq(supportUnscopables, true);
      6        return {x: false, y: true};
      7    }});
      8 
      9    evaluate(`this.gotX = x; try { this.gotY = y; } catch {}`,
     10             {envChainObject: env, supportUnscopables});
     11    assertEq(env.gotX, 1);
     12    assertEq(env.gotY, supportUnscopables ? undefined : 2);
     13 }
     14 test(false);
     15 test(true);