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TypeScript で Redux DevTools extension を使う

Last updated at Posted at 2019-10-22

公式のJS向けコードをそのまま持ってくると Property '__REDUX_DEVTOOLS_EXTENSION_COMPOSE__' does not exist on type 'Window'. TS2339 とコンパイラに怒られてしまう。

そこで、 window__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ を持つこと、およびその型を明示的にコンパイラに伝える必要がある。

以下の型定義を ts ファイル中に書くだけでいい。

partial.ts
interface ExtendedWindow extends Window {
  __REDUX_DEVTOOLS_EXTENSION_COMPOSE__?: typeof compose;
}
declare var window: ExtendedWindow;

全体としては以下のような形。

store.ts
import {
  createStore,
  applyMiddleware,
  compose,
} from "redux";

interface ExtendedWindow extends Window {
  __REDUX_DEVTOOLS_EXTENSION_COMPOSE__?: typeof compose;
}
declare var window: ExtendedWindow;

const composeReduxDevToolsEnhancers = typeof window === 'object' && window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ || compose;

// TODO: 適宜ミドルウェア定義、本記事とは関係ないので割愛
const middlewares = [];

const store = createStore(
  initReducer(),
  state,
  composeReduxDevToolsEnhancers(applyMiddleware(...middlewares))
);
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