adding.tsx

import type { ComponentType } from "react"
import { createStore } from "https://framer.com/m/framer/store.js@^0.3.0"

const useStore = createStore({ count: 0 })

export const withCount = (Component): ComponentType => {
    return (props) => {
        const [store, setStore] = useStore()
        return <Component {...props} text={`${store.count}`} />
    }
}

export const withIncrement = (Component): ComponentType => {
    return (props) => {
        const [store, setStore] = useStore()
        const onTap = () => setStore({ count: store.count + 1 })
        return <Component {...props} onTap={onTap} />
    }
}

Using this code worked in preview, but not when publishing the site.

Updating store.js to 1.0.0 fixed that:
import { createStore } from "https://framer.com/m/framer/store.js@^1.0.0"

Thanks to Sakibul Islam for the solution (https://www.framer.community/c/developers/store-not-working-on-published-site).