TypeScript FSA utilities for redux-thunk - shamelessly based on typescript-fsa-redux-saga and ...
Clone or download


TypeScript FSA utilities for redux-thunk

npm (tag) npm GitHub last commit (branch) Build Status codecov

NOTE: There's probably breaking changes from 1.x. Read on to find out more and check the notes at the bottom for more info.


npm i typescript-fsa-redux-thunk@beta redux redux-thunk


thunkToAction(ThunkActionCreator): ((Params) => Result)

Another useful cast function that can help when attempting to extract the return value out of your async action creator. If the action is being pre-bound to dispatch, then all we want back is the return value (the action object). Coming soon: an example. TL;DR: pass your async action creator into this before passing it to bindActionCreators or the mapDispatchToProps object (react-redux).

bindThunkAction(AsyncActionCreators, AsyncWorker): ThunkActionCreator

Creates redux-thunk that wraps the target async actions. Resulting thunk dispatches started action once it is started and done/failed upon finish.

asyncFactory<State, Extra>(ActionCreatorFactory): ((type: string, AsyncWorker) => ({ async: AsyncActionCreators, action: ThunkActionCreator }))

Factory function to easily create a typescript-fsa redux thunk.

* Of this API, you may only end up using asyncFactory and thunkToAction (if you're using react-redux)


import 'isomorphic-fetch';
import { createStore, applyMiddleware, AnyAction } from 'redux';
import thunkMiddleware, { ThunkMiddleware } from 'redux-thunk';
import { reducerWithInitialState } from 'typescript-fsa-reducers';
import actionCreatorFactory from 'typescript-fsa';
import { asyncFactory } from 'typescript-fsa-redux-thunk';

/** Parameters used for logging in */
interface LoginParams {
	email: string;
	password: string;

/** The object that comes back from the server on successful login */
interface UserToken {
	token: string;

/** The shape of our Redux store's state */
interface State {
	title: string;
	userToken: UserToken;
	loggingIn?: boolean;
	error?: Error;

/** The typescript-fsa action creator factory function */
const create = actionCreatorFactory('examples');

/** The typescript-fsa-redux-thunk async action creator factory function */
const createAsync = asyncFactory<State>(create);

/** Normal synchronous action */
const changeTitle = create<string>('Change the title');

/** The asynchronous login action */
const login = createAsync<LoginParams, UserToken>(
	async (params, dispatch) => {
		const url = `https://reqres.in/api/login`;
		const options: RequestInit = {
			method: 'POST',
			body: JSON.stringify(params),
			headers: {
				'Content-Type': 'application/json; charset=utf-8'
		const res = await fetch(url, options);
		if (!res.ok) {
			throw new Error(
				`Error ${res.status}: ${res.statusText} ${await res.text()}`);

		dispatch(changeTitle('You are logged-in'));

		return res.json();

/** An initial value for the application state */
const initial: State = {
	title: 'Please login',
	userToken: {
		token: ''

/** Reducer, handling updates to indicate logging-in status/error */
const reducer = reducerWithInitialState(initial)
	.case(changeTitle, (state, title) => ({
	.case(login.async.started, state => ({
		loggingIn: true,
		error: undefined
	.case(login.async.failed, (state, { error }) => ({
		loggingIn: false,
	.case(login.async.done, (state, { result: userToken }) => ({
		loggingIn: false,
		error: undefined

/** Putting it all together */
(async () => {
	// Declaring the type of the redux-thunk middleware is what makes
	// `store.dispatch` work. (redux@4.x, redux-thunk@2.3.x)
	const thunk: ThunkMiddleware<State, AnyAction> = thunkMiddleware;
	const store = createStore(reducer, applyMiddleware(thunk));

	try {
		const userToken = await store.dispatch(login.action({
			email: 'test@example.com',
			password: 'password'

		console.log(store.getState().title, userToken);
	} catch (err) {

Note: A change from 1.x is the result type is not always assumed to be a Promise. If you want the result to be a promise, just return one from your worker function; but continue to specify the result as T rather than Promise<T> (same as 1.x).