ReferenceError: window is not defined NextJS

Question

I am getting error while building the app for the production. And it kept saying that ReferenceError: window is not defined. I am lost to solve the problem

FullCode:

const [windowSize, setWindowSize] = useState<WindowInfo>({
        width: window.innerWidth,
        height: window.innerHeight,
    });

    useEffect(() => {
        if (typeof window !== "undefined") { // error showing in this line
            function handleResize() {
                const data: WindowInfo = {
                    width: window.innerWidth,
                    height: window.innerHeight,
                }

                setWindowSize(data);
            }

            window.addEventListener("resize", handleResize);

            handleResize();

            return () => window.removeEventListener("resize", handleResize);
        }
    }, []);

anyone can tell me the workaround of this problem

Will Taylor · Accepted Answer · 2020-12-20 14:49:12Z

4

window is a browser only thing. On the NodeJS server, window will not be defined.

You are already handling this inside of useEffect, but not in useState. You need something like this:

const isBrowser = (typeof window !== "undefined");
const [windowSize, setWindowSize] = useState<WindowInfo>({
    width: isBrowser ? window.innerWidth : 0,
    height: isBrowser ? window.innerHeight : 0,
});

I used 0 as a default in the above, but you can use whatever is sensible for your project.

answered Dec 20, 2020 at 14:49

Will Taylor

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