Don't use JSX

lib/context-store.js

@@ -19,7 +19,7 @@ export const createStore = storeDef => {
   const context = createContext(null)
   const Provider = ({ children }) => {
     const store = useReducerStore(storeDef)
-    return <context.Provider value={store}>{children}</context.Provider>
+    return React.createElement(context.Provider, { value: store }, children)
   }
   const useStore = () => useContext(context)
   return { Provider, Consumer: context.Consumer, useStore }