/** * Any copyright is dedicated to the Public Domain. * http://creativecommons.org/publicdomain/zero/1.0/ */ onmessage = function(event) { postMessage({ event: "console exists", status: !!console, last: false }); var logCalled = false; console.log = function() { logCalled = true; }; console.log("foo"); postMessage({ event: "console.log is replaceable", status: logCalled, last: false, }); console = 42; postMessage({ event: "console is replaceable", status: console === 42, last: true, }); };