この規模でreduxは草だけど流石にstoreとactionは別で管理したいって時はredux-zeroがオススメ

redux-zero

version

node：8.11.3
yarn：1.7.0

setup

npx create-react-app my-app --scripts-version=react-scripts-ts
cd my-app
yarn add redux-zero axios
yarn add -D json-server
touch db.json src/store.ts src/actions.ts

tslint.json

  "rules": {
    "no-console": false,
    "no-empty-interface": false,
    "no-shadowed-variable": false,
    "variable-name": false
  }

db.json

{
  "comments": [
    { "id": 1, "body": "some comment", "postId": 1 }
  ]
}

store.ts

import createStore from "redux-zero";

interface IState {
  count?: number;
  data?: any;
  loading?: boolean;
}

const initialState: IState = { count: 1, data: [], loading: false };

// tsエラーがでるので一旦any型へ格納
const _createStore: any = createStore;
const store = _createStore(initialState);

export default store;

actions.ts

import client from "axios";

const actions = ({ setState }: any) => ({
  decrement: (state: any) => ({ count: state.count - 1 }),
  // 非同期もいける
  getComments: (state: any) => {
    setState({ loading: true });
    return client
      .get("http://localhost:3000/comments")
      .then(payload => ({ data: payload.data, loading: false }))
      .catch(error => ({ error, loading: false }));
  },
  increment: (state: any) => ({ count: state.count + 1 })
});

export default actions;

App.tsx

import * as React from "react";
import { connect } from "redux-zero/react";
import actions from "./actions";

interface IProps {
  store?: any;
}

interface IState {}

const mapToProps = ({ count, data, loading }: any) => ({
  count,
  data,
  loading
});

class App extends React.Component<IProps, IState> {
  public constructor(readonly props: any) {
    super(props);
  }

  public render(): JSX.Element {
    return (
      <div>
        <h1>{this.props.count}</h1>
        <div>
          <button onClick={this.props.decrement}>decrement</button>
          <button onClick={this.props.increment}>increment</button>
          <button onClick={this.props.getComments}>getComments</button>
        </div>
        <ul>{this.props.data.map((v: any) => <li key={v.id}>{v.body}</li>)}</ul>
      </div>
    );
  }
}

export default connect(
  mapToProps,
  actions
)(App);

index.tsx

import * as React from "react";
import * as ReactDOM from "react-dom";
import { Provider } from "redux-zero/react";
import App from "./App";
import store from "./store";

const Root = () => (
  <Provider store={store}>
    <App />
  </Provider>
);

ReactDOM.render(<Root />, document.getElementById("root") as HTMLElement);

start

yarn run json-server --watch db.json
yarn start

「...このライブラリ略したらリゼロですやん」