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Support editable useState hooks in DevTools (#14906)
* ReactDebugHooks identifies State and Reducer hooks as editable * Inject overrideHookState() method to DevTools to support editing in DEV builds * Added an integration test for React DevTools, react-debug-tools, and overrideHookState
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packages/react-debug-tools/src/__tests__/ReactDevToolsHooksIntegration-test.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,176 @@ | ||
| /** | ||
| * Copyright (c) Facebook, Inc. and its affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| * | ||
| * @emails react-core | ||
| * @jest-environment node | ||
| */ | ||
|
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| 'use strict'; | ||
|
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| describe('React hooks DevTools integration', () => { | ||
| let React; | ||
| let ReactDebugTools; | ||
| let ReactTestRenderer; | ||
| let act; | ||
| let overrideHookState; | ||
|
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| beforeEach(() => { | ||
| global.__REACT_DEVTOOLS_GLOBAL_HOOK__ = { | ||
| inject: injected => { | ||
| overrideHookState = injected.overrideHookState; | ||
| }, | ||
| supportsFiber: true, | ||
| onCommitFiberRoot: () => {}, | ||
| onCommitFiberUnmount: () => {}, | ||
| }; | ||
|
|
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| jest.resetModules(); | ||
|
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| React = require('react'); | ||
| ReactDebugTools = require('react-debug-tools'); | ||
| ReactTestRenderer = require('react-test-renderer'); | ||
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| act = ReactTestRenderer.act; | ||
| }); | ||
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| it('should support editing useState hooks', () => { | ||
| let setCountFn; | ||
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| function MyComponent() { | ||
| const [count, setCount] = React.useState(0); | ||
| setCountFn = setCount; | ||
| return <div>count:{count}</div>; | ||
| } | ||
|
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| const renderer = ReactTestRenderer.create(<MyComponent />); | ||
| expect(renderer.toJSON()).toEqual({ | ||
| type: 'div', | ||
| props: {}, | ||
| children: ['count:', '0'], | ||
| }); | ||
|
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| const fiber = renderer.root.findByType(MyComponent)._currentFiber(); | ||
| const tree = ReactDebugTools.inspectHooksOfFiber(fiber); | ||
| const stateHook = tree[0]; | ||
| expect(stateHook.isStateEditable).toBe(true); | ||
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| if (__DEV__) { | ||
| overrideHookState(fiber, stateHook.id, [], 10); | ||
| expect(renderer.toJSON()).toEqual({ | ||
| type: 'div', | ||
| props: {}, | ||
| children: ['count:', '10'], | ||
| }); | ||
|
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| act(() => setCountFn(count => count + 1)); | ||
| expect(renderer.toJSON()).toEqual({ | ||
| type: 'div', | ||
| props: {}, | ||
| children: ['count:', '11'], | ||
| }); | ||
| } | ||
| }); | ||
|
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| it('should support editable useReducer hooks', () => { | ||
| const initialData = {foo: 'abc', bar: 123}; | ||
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| function reducer(state, action) { | ||
| switch (action.type) { | ||
| case 'swap': | ||
| return {foo: state.bar, bar: state.foo}; | ||
| default: | ||
| throw new Error(); | ||
| } | ||
| } | ||
|
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| let dispatchFn; | ||
| function MyComponent() { | ||
| const [state, dispatch] = React.useReducer(reducer, initialData); | ||
| dispatchFn = dispatch; | ||
| return ( | ||
| <div> | ||
| foo:{state.foo}, bar:{state.bar} | ||
| </div> | ||
| ); | ||
| } | ||
|
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| const renderer = ReactTestRenderer.create(<MyComponent />); | ||
| expect(renderer.toJSON()).toEqual({ | ||
| type: 'div', | ||
| props: {}, | ||
| children: ['foo:', 'abc', ', bar:', '123'], | ||
| }); | ||
|
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| const fiber = renderer.root.findByType(MyComponent)._currentFiber(); | ||
| const tree = ReactDebugTools.inspectHooksOfFiber(fiber); | ||
| const reducerHook = tree[0]; | ||
| expect(reducerHook.isStateEditable).toBe(true); | ||
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| if (__DEV__) { | ||
| overrideHookState(fiber, reducerHook.id, ['foo'], 'def'); | ||
| expect(renderer.toJSON()).toEqual({ | ||
| type: 'div', | ||
| props: {}, | ||
| children: ['foo:', 'def', ', bar:', '123'], | ||
| }); | ||
|
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| act(() => dispatchFn({type: 'swap'})); | ||
| expect(renderer.toJSON()).toEqual({ | ||
| type: 'div', | ||
| props: {}, | ||
| children: ['foo:', '123', ', bar:', 'def'], | ||
| }); | ||
| } | ||
| }); | ||
|
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| // This test case is based on an open source bug report: | ||
| // facebookincubator/redux-react-hook/issues/34#issuecomment-466693787 | ||
| it('should handle interleaved stateful hooks (e.g. useState) and non-stateful hooks (e.g. useContext)', () => { | ||
| const MyContext = React.createContext(1); | ||
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| let setStateFn; | ||
| function useCustomHook() { | ||
| const context = React.useContext(MyContext); | ||
| const [state, setState] = React.useState({count: context}); | ||
| React.useDebugValue(state.count); | ||
| setStateFn = setState; | ||
| return state.count; | ||
| } | ||
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| function MyComponent() { | ||
| const count = useCustomHook(); | ||
| return <div>count:{count}</div>; | ||
| } | ||
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| const renderer = ReactTestRenderer.create(<MyComponent />); | ||
| expect(renderer.toJSON()).toEqual({ | ||
| type: 'div', | ||
| props: {}, | ||
| children: ['count:', '1'], | ||
| }); | ||
|
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| const fiber = renderer.root.findByType(MyComponent)._currentFiber(); | ||
| const tree = ReactDebugTools.inspectHooksOfFiber(fiber); | ||
| const stateHook = tree[0].subHooks[1]; | ||
| expect(stateHook.isStateEditable).toBe(true); | ||
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| if (__DEV__) { | ||
| overrideHookState(fiber, stateHook.id, ['count'], 10); | ||
| expect(renderer.toJSON()).toEqual({ | ||
| type: 'div', | ||
| props: {}, | ||
| children: ['count:', '10'], | ||
| }); | ||
|
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| act(() => setStateFn(state => ({count: state.count + 1}))); | ||
| expect(renderer.toJSON()).toEqual({ | ||
| type: 'div', | ||
| props: {}, | ||
| children: ['count:', '11'], | ||
| }); | ||
| } | ||
| }); | ||
| }); |
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