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Wait, window is not defined is the first growing pain for every React dev moving to Next.js.
Encountering this error means your code has started traversing two worlds (Server and Client).
Always ask yourself when writing code: "Is this line executing on the server, or the browser?"
Mastering this sense makes Next.js strictness feel like a superpower, not a limitation. And you'll gracefully reach for useEffect or dynamic instead of panicking.
