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useStream typesafety

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Val Erastov (xibyte) 2020-05-21 17:14:48 -07:00
parent 7f29da53fe
commit 31356b2922
1 changed files with 8 additions and 6 deletions
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14
modules/ui/effects.js → modules/ui/effects.ts
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@ -1,10 +1,12 @@
import React, {useCallback, useContext, useEffect, useState} from 'react';
import {useCallback, useContext, useEffect, useState} from 'react';
import {StreamsContext} from "./streamsContext";
import {ApplicationContext} from "context";
import {Emitter, Stream} from "lstream";
export function useStream(getStream) {
export function useStream<T>(getStream: (ctx: ApplicationContext) => Stream<T>) : T {
const basicStreams = useContext(StreamsContext);
const [state, setState] = useState();
const [state, setState] = useState<{data: T}>();
const stream = typeof getStream === 'function' ? getStream(basicStreams) : getStream;
@ -15,11 +17,11 @@ export function useStream(getStream) {
useEffect(() => stream.attach(data => setState({data})), EMPTY_ARR);
return state ? state.data : (stream.value ? stream.value : null);
// @ts-ignore
return state ? state.data : (stream.value !== undefined ? stream.value : null);
}
export function useStreamWithUpdater(getStream) {
export function useStreamWithUpdater<T>(getStream: (ctx: ApplicationContext) => Emitter<T>) : [T, (val: T|((T) => T)) => void] {
const data = useStream(getStream);
const basicStreams = useContext(StreamsContext);