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I've found a couple, but they either haven't been updated in years or miss basic functionality such as persisting the variant the user is supposed to see.
FYI, the two libraries you linked are fairly the same. What I have done is used Flagr to create our experiments and do the heavy lifting for us. Along with that we use a custom react component to show the Flagr results. The custom package has been modeled heavily after the Pushtell's package you linked.
You can check out the project I'm working on called https://happykit.dev which was specifically written for Next.js. It supports feature flags in server-side rendering and static site generation. You can use these feature flags for A/B testing. The repo is https://github.com/happykit/flags.
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