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Viewing file:     Provider.js (1.39 KB)      -rw-r--r--

import React, { useMemo } from 'react'
import PropTypes from 'prop-types'
import { ReactReduxContext } from './Context'
import Subscription from '../utils/Subscription'
import { useIsomorphicLayoutEffect } from '../utils/useIsomorphicLayoutEffect'

function Provider({ store, context, children }) {
  const contextValue = useMemo(() => {
    const subscription = new Subscription(store)
    subscription.onStateChange = subscription.notifyNestedSubs
    return {
      store,
      subscription,
    }
  }, [store])

  const previousState = useMemo(() => store.getState(), [store])

  useIsomorphicLayoutEffect(() => {
    const { subscription } = contextValue
    subscription.trySubscribe()

    if (previousState !== store.getState()) {
      subscription.notifyNestedSubs()
    }
    return () => {
      subscription.tryUnsubscribe()
      subscription.onStateChange = null
    }
  }, [contextValue, previousState])

  const Context = context || ReactReduxContext

  return <Context.Provider value={contextValue}>{children}</Context.Provider>
}

if (process.env.NODE_ENV !== 'production') {
  Provider.propTypes = {
    store: PropTypes.shape({
      subscribe: PropTypes.func.isRequired,
      dispatch: PropTypes.func.isRequired,
      getState: PropTypes.func.isRequired,
    }),
    context: PropTypes.object,
    children: PropTypes.any,
  }
}

export default Provider