React/Redux : Property 'addCase' does not exist on type 'WritableDraft<~>'

[developerasun]

issue : extraReducers property in createSlice does not exist

in codes,

[developerasun]

solution : split reducers property with extraReducers like below

wrong

const mySlice = createSlice( {
 name : 'mySlice',
 initialState : initialState, 
reducers : { 
 extraReducers : { } 
}, 
} ) 

correct

const mySlice = createSlice( {
 name : 'mySlice',
 initialState : initialState, 
reducers : { },
extraReducers : { }  
} )