는 방법을 제공하는 유형을 createAsyyncthunk

는 방법을 제공하는 유형을 createAsyyncthunk

createAsyncThunk<param1,param2,param3>

the first type-parameter
to tell what type will be returned as a result.

The second type-parameter in `createAsyncThunk`
 tells what argument takes the function inside:
 
 The third type-parameter is an object with:
 `{dispatch?, state?, extra?, rejectValue?}`` fields.

`extra` is useful when we need to pass 
 some static data to the request function,
 like jwt-token or HTTP-headers.

 `rejectValue` is useful when we need to type 
 possible errors.