becase createSlice doesnt support a 'default case'

forwardReducer.ts

import { Slice } from "@reduxjs/toolkit";
import { studentSlice } from "./studentSlice";

type childSelector<P,C> = (state:P) => C;
export const forwardReducer = <P,C>(childSlice:Slice<C>,childSelector:childSelector<P,C>) => {
    const reducerDC = {} as any;//will fix types later
    for (const key in childSlice.actions) {
        if (childSlice.actions.hasOwnProperty(key)) {
            const action = childSlice.actions[key];
            reducerDC[action.type] = (state:P, action:any) => {
                childSlice.reducer(childSelector(state), action);
            }
        }
    }
    console.log({reducerDC, childSlice});
    return reducerDC;
}

studentSlice.ts

import { createSlice, PayloadAction } from "@reduxjs/toolkit";
import { student } from "./student.interface";

export const studentSlice = createSlice({
    name: 'student',
    initialState: {} as any as student,
    reducers:{
        setGrade:(state, action:PayloadAction<string>) => {
            state.studentGrade = action.payload
        }
    }
})

teacherSlice.ts

import { createSlice } from "@reduxjs/toolkit";
import { teacher } from "./teacher.interface";
import { forwardReducer } from "./forwardReducer";
import { studentSlice } from "./studentSlice";
import { student } from "./student.interface";

export const teacherSlice = createSlice({
    name: 'teacher',
    initialState: {student:{}} as any as teacher,
    reducers:{
        setName:(state, action) => {
            state.teacherName = action.payload
        }
    },
    extraReducers: forwardReducer<teacher, student>(studentSlice, state => state.student)
})