useLocalStorage converts Infinity to null

[Steve Van Opstal]

const [number, setNumber] = useLocalStorage("number", Infinity);
console.log(number); // null

Seems to be related to JSON.stringify.

You can workaround this issue by not using Infinity but it would be nice to use this interface as you expect it.

[Jordan Gardner]

I disagree that this belongs here as an issue. This is exactly how the standard was defined to behave:

https://stackoverflow.com/questions/1423081/json-left-out-infinity-and-nan-json-status-in-ecmascript

[Tyler McGinnis]

Related: #253

[Steve Van Opstal]

I disagree that this belongs here as an issue. This is exactly how the standard was defined to behave:

https://stackoverflow.com/questions/1423081/json-left-out-infinity-and-nan-json-status-in-ecmascript

It's not necessarily a software issue but coming across this I had the expectation, given that it's a blackbox function, that there were no restrictions. Only after looking at the source code I realised that it uses JSON.stringify to convert it to a string for localStorage, hence it is not able to handle Infinity and NaN. It might just come down to mentioning this in the docs.

[Phil Green]

I agree with @SteveVanOpstal here: the use of JSON.stringify adds further constraints to the already existing constraints in place when using localStorage.setItem.

If, for example, you decide to send in an object and thus get [object Object] back, that's on you for not supplying a primitive, same as if you were using .setItem directly. It isn't the place of a hook to serialise input, particularly when there is no corresponding deserialising of the output; there is no JSON.parse wrapping localStorage.getItem in getLocalStorageItem...