Uncaught Error: "reducer" is a required argument, and must be a function or an object of functions that can be passed to - Javascript

AdityaPandey
April 2, 2023
210 views
0 votes
2 Answers

I have done hours of debugging and I am unable to find the solution.

import { combineReducers, applyMiddleware } from 'redux';
import thunk from 'redux-thunk';
import { configureStore } from '@redux.js/toolkit';
import { composeWithDevTools } from 'redux-devtools-extension';

let reducer = combineReducers({
  // contains all reducers
});

// here all our data will lie
const initialState = {};

const middleware = [thunk];

const store = configureStore(
  reducer,
  initialState,
  composeWithDevTools(applyMiddleware(...middleware))
);

export default store;

Error:

I just want a todo list to be displayed on browser, which I have written in my App.js.

Answers

- kofeigen
- April 2, 2023 at 9:36 pm
- 0 votes
0
Try:
```
const store=configureStore(
    {
        reducer,
        initialState,
        composeWithDevTools( ... )
    }
)

export default store;
```
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- DrewReese
- April 3, 2023 at 7:58 am
- 0 votes
0
The configureStore utility takes a single argument object with properties reducer, middleware, devTools, preloadedState, and enhancers.
```
import { configureStore } from '@reduxjs/toolkit';
import { combineReducers } from 'redux';

const rootReducer = combineReducers({
  // contains all reducer functions
});

const initialState = {};

const store = configureStore({ // <-- single object argument
  reducer: rootReducer,
  preloadedState: initialState,
});

export default store;
```
Note that I didn’t include the Thunk middleware since Redux Toolkit comes with the Thunk middleware by default, and I didn’t include any regarding devTool since these are also enabled by default.
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