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Merge pull request #36 from reduxjs/feature/port-ts-changes
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,11 +1,11 @@ | ||
| { | ||
| "package": { | ||
| "dependencies": { | ||
| "@reduxjs/toolkit": "^1.1.0", | ||
| "@reduxjs/toolkit": "^1.5.1", | ||
| "@testing-library/jest-dom": "^4.2.4", | ||
| "@testing-library/react": "^9.3.2", | ||
| "@testing-library/user-event": "^7.1.2", | ||
| "react-redux": "^7.1.3" | ||
| "react-redux": "^7.2.3" | ||
| } | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,6 @@ | ||
| // A mock function to mimic making an async request for data | ||
| export function fetchCount(amount = 1) { | ||
| return new Promise((resolve) => | ||
| setTimeout(() => resolve({ data: amount }), 500) | ||
| ); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,42 +1,73 @@ | ||
| import { createSlice } from '@reduxjs/toolkit'; | ||
| import { createAsyncThunk, createSlice } from '@reduxjs/toolkit'; | ||
| import { fetchCount } from './counterAPI'; | ||
|
|
||
| const initialState = { | ||
| value: 0, | ||
| status: 'idle', | ||
| }; | ||
|
|
||
| // 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', | ||
| async (amount) => { | ||
| const response = await fetchCount(amount); | ||
| // The value we return becomes the `fulfilled` action payload | ||
| return response.data; | ||
| } | ||
| ); | ||
|
|
||
| export const counterSlice = createSlice({ | ||
| name: 'counter', | ||
| initialState: { | ||
| value: 0, | ||
| }, | ||
| initialState, | ||
| // The `reducers` field lets us define reducers and generate associated actions | ||
| reducers: { | ||
| increment: state => { | ||
| 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 on those changes | ||
| // immutable state based off those changes | ||
| state.value += 1; | ||
| }, | ||
| decrement: state => { | ||
| decrement: (state) => { | ||
| state.value -= 1; | ||
| }, | ||
| // Use the PayloadAction type to declare the contents of `action.payload` | ||
| incrementByAmount: (state, action) => { | ||
| 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; | ||
| }); | ||
| }, | ||
| }); | ||
|
|
||
| export const { increment, decrement, incrementByAmount } = counterSlice.actions; | ||
|
|
||
| // 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 | ||
| export const incrementAsync = amount => dispatch => { | ||
| setTimeout(() => { | ||
| dispatch(incrementByAmount(amount)); | ||
| }, 1000); | ||
| }; | ||
|
|
||
| // 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) => state.counter.value)` | ||
| export const selectCount = state => state.counter.value; | ||
| // in the slice file. For example: `useSelector((state: RootState) => state.counter.value)` | ||
| export const selectCount = (state) => state.counter.value; | ||
|
|
||
| // 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) => (dispatch, getState) => { | ||
| const currentValue = selectCount(getState()); | ||
| if (currentValue % 2 === 1) { | ||
| dispatch(incrementByAmount(amount)); | ||
| } | ||
| }; | ||
|
|
||
| export default counterSlice.reducer; |
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