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出典: Typescript×ReduxでStateがundefinedに？確認すること！ — ソースコードを解説 / Index

import React from 'react';
import ReactDOM from 'react-dom';
import * as serviceWorker from './serviceWorker';
import {Provider} from "react-redux";
import store from "./Store/store";
import Counter from "./Component/Container";
 
ReactDOM.render(
  <Provider store={store}>
    <Counter />
  </Provider>,
  document.getElementById('root')
);
 
// If you want your app to work offline and load faster, you can change
// unregister() to register() below. Note this comes with some pitfalls.
// Learn more about service workers: https://bit.ly/CRA-PWA
serviceWorker.unregister();

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id: #137a571c0501
lines: 18
extracted: 2026-06-10

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技術記事Gitデータ有React

Typescript×ReduxでStateがundefinedに？確認すること！

6年前12 min

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11 件

TypeScript

import {Action} from 'redux'

export enum	ActionNames{
	Increment = 'inc',

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Action

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TypeScript

import {ActionNames, ActionType} from "../Actions/CounterAction";


export interface IState {

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Reducer

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TypeScript

import {combineReducers,createStore,Action} from 'redux'
import CounterReducer, {IState} from "../Reducers/CounterReducer";
import {ActionType} from "../Actions/CounterAction";

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Store

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TypeScript

import {ReduxAction, ReduxState} from "../Store/store";
import {DecrementAmount, IncrementAmount} from "../Actions/CounterAction";
import {connect} from "react-redux";
import {Dispatch} from "react";

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Container

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TypeScript

import React from "react";
import {IState} from "../Reducers/CounterReducer";
import {ActionDispather} from "./Container";

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Component

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TypeScript

	render() {
		return (
			<div>
				{/*<p>CurrentCount:{this.props.value.num}</p>*/}

▶ 実行可

Reduxでstateが undefinedに？どんな現象？

#724b87f56936

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