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Correct TypeScript typing example for Redux Thunk actions
import {Action, ActionCreator, Dispatch} from 'redux';
import {ThunkAction} from 'redux-thunk';
const reduxAction: ActionCreator = (text: string) => {
const thunkAction: ActionCreator> = (
return (dispatch: Dispatch): Action => {
const asyncThinkAction: ActionCreator<
ThunkAction, IState, void>
return async (dispatch: Dispatch): Promise => {
asyncThinkAction -> asyncThunkAction
@milankorsos This is awesome! This is the clearest example for typing Thunk actions I've come across...
By any chance, do you have examples of your approach for typing a connected component that consumes Thunk actions via mapDispatchToProps? I'm struggling to properly type the parameters to connect...
@danielericlee @milankorsos I'd like to know this as well
@danielericlee @milankorsos @erkrapide I also can't find anywhere fully typed connected stateful component dispatching thunk actions. Help! :)
Great example. Please post one for mapDispatchToProps and connect.
@lassemon
It's just your State's type
Great example. Please post one for mapDispatchToProps and connect.
Thanks for the example. I'm also struggling to figure out if it's possible to correctly type a component that dispatches thunk actions, so an example there would be really helpful too.
@jballantinecondev have you ever found anything on correctly typing a component that dispatches thunk actions?
This appears to be out of date with current Redux v4 and @types/redux-thunk@2.3 typings. In particular, the Dispatch type no longer takes a "State" generic parameter.
export interface Dispatch
(action: A): A;
}
export interface Dispatch {
(action: T): T;
}
How do you use the action which returns a thunk later? I cannot feed it into dispatch function in mapDispatchToProps, since the action creator returns a function (a thunk), and not an action (it doesn't have type property on it).
const mapDispatchToProps = (dispatch: Dispatch, ownProps: OwnProps): DispatchProps => {
return {
handleAsyncAction: () => {
dispatch(Actions.HomePage.asyncFetch())
},
}
}
I can make it work at runtime by casting to any, but ew.
@lazarljubenovic same problem here...
@milankorsos how did you resolve this case?
@lazarljubenovic after some time, I found a solution... here is what I'm doing:
import { connect } from 'react-redux';
import { Action } from 'redux';
import { ThunkDispatch } from 'redux-thunk';
import { MyState } from '../my-store/state';
// ...
const mapDispatchToProps = (dispatch: ThunkDispatch) => {
return {
onRequestClick: (arg: any) => dispatch(myAsyncAction(arg)),
};
}
function myAsyncAction(arg: any) {
return async (dispatch: ThunkDispatch) => {
dispatch(requestDataStartAction(arg));
let result: string;
try {
result = await fetch('/url', { data: arg });
}
catch (error) {
dispatch(requestDataErrorAction(arg, error));
return error;
}
dispatch(requestDataSuccessAction(arg, result));
}
}
export default connect(
mapStateToProps,
mapDispatchToProps
)(MyComponent)
I ran across this trying to find an example of using redux-thunk with typescript. The only thing missing from the examples above is how to type getState.
I opened an issue on redux-thunk, but did not receive much help: reduxjs/redux-thunk#213 (comment)
Also, in my use case, I am dispatching things before and after the promise resolves.
The response from timdorr pointed at the tests, which are quite helpful actually. From those tests, I picked up a pattern that works pretty well. In my main reducers file (where I pull together types for all of the actions and state slices), I'll export a few types for use elsewhere in the application:
export type ThunkResult = ThunkAction
export type ThunkDispatch = ThunkDispatch
export default combineReducers({
// various reducers
})
When defining an async thunk action, they'll use ThunkResult as the return type, this looks like this:
export function someAction1(): ThunkResult {
return (dispatch, getState) => {
// do da dispatch
// also `getState` is typed as `() => IStoreState`
}
}
This also works with async functions (and by nature, promise.then works):
export function asyncAction2(): ThunkResult> {
return async (dispatch, getState) => {
await someThing()
return true
}
}
export function asyncAction3(): ThunkResult {
return (dispatch, getState) => {
dispatch(asyncAction2()).then(result => assert(result)) // no type errors!
}
}
When using mapDispatchToProps, I'll use ThunkDispatch.... this only seems necessary when getting dispatch through react-redux -- if I have a reference to the store, the dispatch action seems to come with the additional typings for handling dispatches with thunks fine.... pulling it all together for a connected container --
const selector= createSelector((state: IStoreState) => state.someSlice, slice => ({slice}))
const mapDispatchToProps = (dispatch: ThunkDispatch): ComponentActionProps => ({
handleDrawCard: () => dispatch(asyncAction()) // works fine, even with no {type: string} on asyncAction
})
const mapStateToProps = (state: IStoreState): ComponentConnectedProps => selector(state)
export const Container = connect(mapStateToProps, mapDispatchToProps)(ContainerComponent)
I'm also trying to tie-up Typescript with React/Redux/Thunk/etc 😃
For those who are just like me, one should mention that at first, you need to import all the stuff:
these types might be useful to people using react 4 & redux thunk 2.3.
ActionCreator,IState,null,AnyAction>>
where Promise is an example of return type of the thunk
and AnyAction is the type of action you'll dispatch
ThunkDispatch
similar arguments, see source of redux-thunk
This works when I pass mapDispatchToProps as a function.
Doesn't work when I pass it as an object
As @aaronlifton2 mentioned up above it looks like the type signature for ThunkAction has changed in newer versions of redux-thunk.
This works when I pass mapDispatchToProps as a function.
Doesn't work when I pass it as an object
Has this been solved yet? I get a similar error when trying to use the object form of mapDispatch; using the function form works fine.
Unless I'm missing something obvious, this is a rather sharp edge :(
Following the introductory Redux docs, you are guided to prefer the object form of mapDispatch, and then in the typescript section, you are introduced the ThunkDispatch type, which doesn't work with the object form of mapDispatch.
I am migrating to Typescript for fun, but I am not understanding how I can avoid all the boilerplate when I am writing my actions and reducers like this:
const initialState = {
fetching: false,
fetched: false,
user: undefined,
errors: undefined,
};
export default function (state = initialState, action) {
switch (action.type) {
case 'GET_USER_PENDING':
return {
...state,
fetching: true,
};
case 'GET_USER_FULFILLED':
return {
...state,
fetching: false,
fetched: true,
user: action.payload,
};
case 'GET_USER_REJECTED':
return {
...state,
fetching: false,
errors: action.payload,
};
default:
return state;
}
}
import axios from 'axios';
export const getUser = () => async (dispatch) => {
dispatch({ type: 'GET_USER_PENDING' });
try {
const { data } = await axios.get('/api/auth/local/current');
dispatch({ type: 'GET_USER_FULFILLED', payload: data });
} catch (err) {
dispatch({ type: 'GET_USER_REJECTED', payload: err.response.data });
}
};
Would I be expected to write an interface for each _PENDING, _FULFILLED, and _REJECTED action?
I may have a huge misunderstand of redux-thunk as I am a newbie. I don't understand how I can send _REJECTED actions if I use the implementation of Typescript and redux-thunk documented here: https://redux.js.org/recipes/usage-with-typescript#usage-with-redux-thunk
export type ThunkResult = ThunkAction
Just want to say thank you, I struggled with it and your answer helped me solve the problem. 😄
TS2339: Property 'a' does not exist on type 'ThunkAction { a: boolean; b: string; }>, CombinedState{ auth: never; }>, null, Action >'
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