23 lines
760 B
TypeScript
23 lines
760 B
TypeScript
import { useCallback, useEffect, useState } from 'react'
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import KetchupClient from 'ketchup-client'
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export type Dispatch<Action> = (action: Action, timestamp?: number) => void
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export default function useKetchup<State, Action>(
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url: string,
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reducer: (state: State, action: Action) => State,
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): [State | undefined, Dispatch<Action>] {
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const [proj, setProj] = useState<State>()
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const [kc, setKc] = useState<KetchupClient<State, Action>>()
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useEffect(() => {
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const newKc = new KetchupClient(url, reducer)
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setKc(newKc)
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newKc.on('projection', setProj)
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return () => { newKc.off('projection', setProj) }
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}, [url, reducer])
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const dispatch = useCallback((a, ts) => kc?.dispatch(a, ts), [kc])
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return [proj, dispatch, /* connected */]
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}
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