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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,24 @@ | ||
| import { configureStore, ThunkAction, Action } from '@reduxjs/toolkit'; | ||
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| import counterReducer from '../features/counterSlice'; | ||
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| export function makeStore() { | ||
| return configureStore({ | ||
| reducer: { counter: counterReducer }, | ||
| }); | ||
| } | ||
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| const store = makeStore(); | ||
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| export type AppState = ReturnType<typeof store.getState>; | ||
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| export type AppDispatch = typeof store.dispatch; | ||
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| export type AppThunk<ReturnType = void> = ThunkAction< | ||
| ReturnType, | ||
| AppState, | ||
| unknown, | ||
| Action<string> | ||
| >; | ||
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| export default store; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| import { createAsyncThunk, createSlice, PayloadAction } from '@reduxjs/toolkit'; | ||
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| import type { AppState, AppThunk } from '../app/store'; | ||
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| export interface CounterState { | ||
| value: number; | ||
| status: 'idle' | 'loading' | 'failed'; | ||
| } | ||
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| const initialState: CounterState = { | ||
| value: 0, | ||
| status: 'idle', | ||
| }; | ||
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| // The function below is called a thunk and allows us to perform async logic. It | ||
| // can be dispatched like a regular action: `dispatch(incrementAsync(10))`. This | ||
| // will call the thunk with the `dispatch` function as the first argument. Async | ||
| // code can then be executed and other actions can be dispatched. Thunks are | ||
| // typically used to make async requests. | ||
| export const incrementAsync = createAsyncThunk( | ||
| 'counter/fetchCount', | ||
| (amount: number) => { | ||
| const response = { data: 1 }; | ||
| // The value we return becomes the `fulfilled` action payload | ||
| return response.data; | ||
| } | ||
| ); | ||
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| export const counterSlice = createSlice({ | ||
| name: 'counter', | ||
| initialState, | ||
| // The `reducers` field lets us define reducers and generate associated | ||
| // actions | ||
| reducers: { | ||
| increment: (state) => { | ||
| // Redux Toolkit allows us to write "mutating" logic in reducers. It | ||
| // doesn't actually mutate the state because it uses the Immer library, | ||
| // which detects changes to a "draft state" and produces a brand new | ||
| // immutable state based off those changes | ||
| state.value += 1; | ||
| }, | ||
| decrement: (state) => { | ||
| state.value -= 1; | ||
| }, | ||
| // Use the PayloadAction type to declare the contents of `action.payload` | ||
| incrementByAmount: (state, action: PayloadAction<number>) => { | ||
| state.value += action.payload; | ||
| }, | ||
| }, | ||
| // The `extraReducers` field lets the slice handle actions defined elsewhere, | ||
| // including actions generated by createAsyncThunk or in other slices. | ||
| extraReducers: (builder) => { | ||
| builder | ||
| .addCase(incrementAsync.pending, (state) => { | ||
| state.status = 'loading'; | ||
| }) | ||
| .addCase(incrementAsync.fulfilled, (state, action) => { | ||
| state.status = 'idle'; | ||
| state.value += action.payload; | ||
| }); | ||
| }, | ||
| }); | ||
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| export const { increment, decrement, incrementByAmount } = counterSlice.actions; | ||
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| // The function below is called a selector and allows us to select a value from | ||
| // the state. Selectors can also be defined inline where they're used instead of | ||
| // in the slice file. For example: | ||
| // `useSelector((state: RootState) => state.counter.value)` | ||
| export const selectCount = (state: AppState) => state.counter.value; | ||
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| // We can also write thunks by hand, which may contain both sync and async | ||
| // logic. Here's an example of conditionally dispatching actions based on | ||
| // current state. | ||
| export const incrementIfOdd = (amount: number): AppThunk => { | ||
| return (dispatch, getState) => { | ||
| const currentValue = selectCount(getState()); | ||
| if (currentValue % 2 === 1) { | ||
| dispatch(incrementByAmount(amount)); | ||
| } | ||
| }; | ||
| }; | ||
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| export default counterSlice.reducer; |
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