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reduxBug.js
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import React from 'react';
import {createStore} from 'redux';
import {Provider, useSelector, useDispatch, batch} from 'react-redux';
import {
Text,
Button,
unstable_batchedUpdates as batchedUpdates,
} from 'react-native';
// store
const INIT_STATE = {bool: false};
const reducer = (state = INIT_STATE, action) => {
switch (action.type) {
case 'TOGGLE':
return {bool: !state.bool};
default:
return state;
}
};
const store = createStore(reducer, INIT_STATE);
const selector = state => ({
bool: state.bool,
});
// components
const ReduxBugParent = () => {
const dispatch = useDispatch();
const {bool} = useSelector(selector);
const boolFromStore = store.getState().bool;
return (
<>
<Button
title="Click Me"
onPress={() => {
dispatch({type: 'NOOP'});
dispatch({type: 'TOGGLE'});
}}
/>
<Button
title="[BUG] Click Me (setTimeout)"
onPress={() => {
setTimeout(() => {
dispatch({type: 'NOOP'});
dispatch({type: 'TOGGLE'});
}, 0);
}}
/>
<Button
title="Click Me (setTimeout & batched from react-native)"
onPress={() => {
setTimeout(() => {
batchedUpdates(() => {
dispatch({type: 'NOOP'});
dispatch({type: 'TOGGLE'});
});
}, 0);
}}
/>
<Button
title="Click Me (setTimeout & batched from react-redux)"
onPress={() => {
setTimeout(() => {
batch(() => {
dispatch({type: 'NOOP'});
dispatch({type: 'TOGGLE'});
});
}, 0);
}}
/>
<Text>bool from useSelector is {JSON.stringify(bool)}</Text>
<Text>bool from store.getState is {JSON.stringify(boolFromStore)}</Text>
{bool !== boolFromStore && <Text>They are not same!</Text>}
</>
);
};
export const ReduxBugDemo = () => {
return (
<Provider store={store}>
<ReduxBugParent />
</Provider>
);
};