[toString]

[wikiwiki000]

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[abrahamjuliot]

That is a great question. In short, if we call the toString method on each of these (getDate, etc... methods), the result should be 'function getDate() { [native code] }' or 'function getDate() {\n [native code]\n}' depending on the JS engine. When object methods like this are overwritten or spoofed, the toString method no longer returns the native result. Instead, the result leaks the tampering code. For example, open the console in your browser and enter this with the extension on:

Date.prototype.setDate.toString()

Date.prototype.setDate.toString().toString()

Here's an in dept article on this topic.

https://adtechmadness.wordpress.com/2019/03/23/javascript-tampering-detection-and-stealth/