How to fix You must pass in a reducers object as the first argument to createSlice in React

import { createSlice } from '@reduxjs/toolkit';

const mySlice = createSlice({
  name: 'sliceName',
  initialState: { /* initial state */ },
  reducers: {
    // Your case reducer functions here
    increment: (state) => {
      state.value += 1;
    },
  },
});

const mySlice = createSlice({
  name: 'sliceName',
  initialState: {},
  reducers: {}, // Empty but present
});

// Correct import for Redux Toolkit
import { createSlice } from '@reduxjs/toolkit';

// Not from 'redux' or other packages

// Example of dynamic creation (still needs reducers)
const sliceConfig = {
  name: 'mySlice',
  initialState,
  reducers: myReducers, // Make sure myReducers is defined and not undefined
};
const mySlice = createSlice(sliceConfig);

import { createSlice } from '@reduxjs/toolkit';

const testSlice = createSlice({
  name: 'test',
  initialState: { value: 0 },
  reducers: {
    testAction: (state) => {
      state.value += 1;
    },
  },
});

console.log(testSlice.actions.testAction());