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| const EPIC_END = Symbol('EPIC_END'); | |
| const createEpicStore = (reducer, initialState, epic) => { | |
| let epicMiddleware = createEpicMiddleware(); | |
| let store = createStore( | |
| reducer, | |
| initialState, | |
| applyMiddleware(epicMiddleware) | |
| ); | |
| const run = () => { | |
| const rootEpic = (action, ...rest) => | |
| epic(action, ...rest).pipe( | |
| takeUntil(action.ofType({ type: EPIC_END })) | |
| ); | |
| epicMiddleware.current.run(rootEpic); | |
| return () => { | |
| store.dispatch({ type: EPIC_END }); | |
| store = undefined; | |
| epicMiddleware = undefined; | |
| }; | |
| }; | |
| return { | |
| ...store, | |
| run | |
| }; | |
| }; | |
| const useEpic = (reducer, initialState, epic) => { | |
| const store = useRef(); | |
| const [state, setState] = useState(initialState); | |
| if (!store.current) { | |
| store.current = createEpicStore(reducer, initialState, epic); | |
| } | |
| useEffectOnce(() => { | |
| const unsubscribe = store.current.subscribe(() => | |
| setState(store.current.getState()) | |
| ); | |
| const destroy = store.run(); | |
| return () => { | |
| unsubscribe(); | |
| destroy(); | |
| }; | |
| }); | |
| return [state, store.dispatch]; | |
| }; |
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