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  • simulate what native object is not exist

    - by Naitro
    Here is the situation: I have checking on existing class like: ('Promise' in window) // true/false` And I wanna force return false or true on it, can I do it? Yes, I can check it by some other way, like ` window.Promise = undefined; window.Promise === undefined; Or something like this, but can I somehow delete this object or simulate

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