Error with Redux DevTools Extension using TS: "Property '__REDUX_DEVTOOLS_EXTENSION_COMPOSE__' does not exist on type 'Window'."?

This is a special case of this question. Redux doesn't provide types for __REDUX_DEVTOOLS_EXTENSION_COMPOSE__ because this function is exposed by Redux DevTools, not Redux itself.

It's either:

const composeEnhancers = window['__REDUX_DEVTOOLS_EXTENSION_COMPOSE__'] as typeof compose || compose;

Or:

declare global {
    interface Window {
      __REDUX_DEVTOOLS_EXTENSION_COMPOSE__?: typeof compose;
    }
}

const composeEnhancers = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ || compose;

This is already done by redux-devtools-extension package that contains TypeScript typings. If it's installed, its imports should be used instead of accessing __REDUX_DEVTOOLS_EXTENSION_COMPOSE__ manually.

My approach to the issue was the following:

export const composeEnhancers =
  (window && (window as any).__REDUX_DEVTOOLS_EXTENSION_COMPOSE__) || compose;

The most streamlined way to make this work with TypeScript is to use the redux-devtools-extension and install as a dev dependency as follows:

npm install --save-dev redux-devtools-extension

The next step for those new to redux and these developer tools was confusing and unclear. The docs all have code like the following:

const store = createStore(reducer, composeWithDevTools(
  applyMiddleware(...middleware),
  // other store enhancers if any
));

The problem is I don't have any middleware configured so this wasn't working. In it's most primitive usage, this is all you need:

import { composeWithDevTools } from 'redux-devtools-extension';

const store = createStore(myReducer, composeWithDevTools());

At this point if you click the extension in the browser and there is a valid redux store, you will be able to inspect the state.

This is an alternative approach to using (window as any) and also clears up just exaclty how to use the redux-devtools-extension in its minimal form.