React Reducer Provider with Injection and Flow typings

1 . Add react-reducer-provider (and prerequisite) to package.json:

  ..
  "dependencies": {
    "react": "^16.8.0"
    "react-reducer-provider": "5.0.0",
    ..

2 . Create the Reducer Provider:

SomeReducerProvider.jsx:

import React from 'react'
import { SyncReducerProvider } from 'react-reducer-provider'

import type {
  Element,
  Node
} from 'react'

const initialState: number = 0

function reduce(prevState: number, action: string): number {
  switch (action) {
    case 'ACTION1':
      return prevState + 1
    case 'ACTION2':
      return prevState - 1
    default:
      return prevState
  }
}

function SomeReducerProvider({ children }: {children: Element<any>}): Node {
  return (
    <SyncReducerProvider
      id='someNamedReducer'
      reducer={reduce}
      initialState={initialState}
    >
      {children}
    </SyncReducerProvider>
  )
}

export {
  SomeReducerProvider
}

3 . Define some Components:

SomeComponent1.jsx:

import React from 'react'

import type { Node } from 'react'
import type { Dispatcher } from 'react-reducer-provider'

export default function SomeComponent1({dispatch}: {dispatch: Dispatcher<string>}): Node {
  return (
    <button onClick={() => dispatch('ACTION1')}>
      Go up!
    </button>
  )
}

SomeComponent2.jsx:

import React from 'react'

import type { Node } from 'react'
import type { Dispatcher } from 'react-reducer-provider'

export default function SomeComponent2({dispatch}: {dispatch: Dispatcher<string>}): Node {
  return (
    <button onClick={() => dispatch('ACTION2')}>
      Go down!
    </button>
  )
}

SomeComponentN.jsx:

import React from 'react'

import type { Node } from 'react'

export default function SomeComponentN({currentState}: {currentState: number}): Node {
  return (
    <div>
      Current:{currentState}
    </div>
  )
}

4 . Create the bridge between the Reducer Provider and the Components:

SomeContainer.jsx:

import SomeComponent1 from './path/to/SomeComponent1'
import SomeComponent2 from './path/to/SomeComponent2'
import SomeComponentN from './path/to/SomeComponentN'
import React from 'react'
import { useReducer } from 'react-reducer-provider'

import type { Node } from 'react'

export default function SomeContainer(): Node {
  const [ state, dispatch ] = useReducer<number, string>(someNamedReducer)
  return (
    <div>
      <SomeComponent1 dispatch={dispatch}/>
      <SomeComponent2 dispatch={dispatch}/>
      <SomeComponentN currentState={state}/>
    </div>
  )
}

SomeMain.jsx:

import SomeContainer from './path/to/SomeContainer'
import { SomeReducerProvider } from '../path/to/SomeReducerProvider'
import React from 'react'

import type { Node } from 'react'

export default function SomeContainer(): Node {
  return (
    <SomeReducerProvider>
      <SomeContainer />
    </SomeReducerProvider>
  )
}

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