.ts

// doesn't work
import { createSlice, PayloadAction } from "@reduxjs/toolkit";

const todo = createSlice({
  name: "todo",
  initialState: [],
  reducers: {
    add: (state, action: PayloadAction<string>) => {
      state.push(action.payload); // Argument of type 'string' is not assignable to parameter of type 'never'.ts(2345)
    }
});


// works
import { createSlice, PayloadAction } from "@reduxjs/toolkit";

interface Todo {
  id: number;
  task: string;
}

const initialState: Todo[] = [];

const todo = createSlice({
  name: "todo",
  initialState: initialState,
  reducers: {
    add: (state, action: PayloadAction<Todo>) => {
      state.push(action.payload);
  }
});