SSR hydration warning

[thorsten-stripe]

Hey, this module is great and we use it over at https://github.com/dayhaysoos/use-shopping-cart :) ❤️

We've had some folks run into this issue (dayhaysoos/use-shopping-cart#122) which seems to be a hydration warning because the server-side rendered value differs from the value on the client.

Have you seen that before by any chance? I did some digging, and the general recommendation is to use the same initial state as on the server, and then update it in a useEffect hook, but I'm not sure if that's possible within a custom hook 🤔

Reproduction steps

I've set up an environment to reproduce: https://codesandbox.io/s/autumn-grass-vhu4e?expanddevtools=1&fontsize=14&hidenavigation=1&theme=dark

1. Navigate to CodeSandbox
2. Switch to the Console tab (Second tab next to Terminal in the bottom right dev tools)
3. Click the + button a couple times so counter is !== 0
4. Click preview reload button
5. See warning in console