react-rx/dist/index.cjs.map

React + RxJS = <3

{"version":3,"file":"index.cjs","sources":["../src/useObservable.ts","../src/useObservableEvent.ts"],"sourcesContent":["import {useCallback, useMemo, useSyncExternalStore} from 'react'\nimport {\n  asapScheduler,\n  catchError,\n  finalize,\n  type Observable,\n  type ObservedValueOf,\n  of,\n  share,\n  timer,\n} from 'rxjs'\nimport {map, tap} from 'rxjs/operators'\n\nfunction getValue<T>(value: T): T extends () => infer U ? U : T {\n  return (typeof value === 'function' ? (value as () => any)() : value) as T extends () => infer U\n    ? U\n    : T\n}\n\ninterface ObservableState<T> {\n  didEmit: boolean\n  snapshot?: T\n  error?: unknown\n}\n\ninterface CacheRecord<T> {\n  observable: Observable<void>\n  state: {\n    didEmit: boolean\n    snapshot?: T\n    error?: unknown\n  }\n  getSnapshot: (initialValue: unknown) => T\n}\n\nconst cache = new WeakMap<Observable<any>, CacheRecord<any>>()\n\nconst EMPTY_OBJECT = {}\n\n/** @public */\nexport interface UseObservableOptions {\n  disabled?: boolean\n}\n\n/** @public */\nexport function useObservable<ObservableType extends Observable<any>>(\n  observable: ObservableType,\n  initialValue: ObservedValueOf<ObservableType> | (() => ObservedValueOf<ObservableType>),\n  options?: UseObservableOptions,\n): ObservedValueOf<ObservableType>\n/** @public */\nexport function useObservable<ObservableType extends Observable<any>>(\n  observable: ObservableType,\n): undefined | ObservedValueOf<ObservableType>\n/** @public */\nexport function useObservable<ObservableType extends Observable<any>, InitialValue>(\n  observable: ObservableType,\n  initialValue: InitialValue | (() => InitialValue),\n  options?: UseObservableOptions,\n): InitialValue | ObservedValueOf<ObservableType>\n/** @public */\nexport function useObservable<ObservableType extends Observable<any>, InitialValue>(\n  observable: ObservableType,\n  initialValue?: InitialValue | (() => InitialValue),\n  options: UseObservableOptions = EMPTY_OBJECT,\n): InitialValue | ObservedValueOf<ObservableType> {\n  const {disabled = false} = options\n\n  const instance = useMemo(() => {\n    if (!cache.has(observable)) {\n      // This separate object is used as a stable reference to the cache entry's snapshot and error.\n      // It's used by the `getSnapshot` closure.\n      const state: ObservableState<ObservedValueOf<ObservableType>> = {\n        didEmit: false,\n      }\n      const entry: CacheRecord<ObservedValueOf<ObservableType>> = {\n        state,\n        observable: observable.pipe(\n          map((value) => ({snapshot: value, error: undefined})),\n          catchError((error) => of({snapshot: undefined, error})),\n          tap(({snapshot, error}) => {\n            state.didEmit = true\n            state.snapshot = snapshot\n            state.error = error\n          }),\n          // Note: any value or error emitted by the provided observable will be mapped to the cache entry's mutable state\n          // and the observable is thereafter only used as a notifier to call `onStoreChange`, hence the `void` return type.\n          map((value) => void value),\n          // Ensure that the cache entry is deleted when the observable completes or errors.\n          finalize(() => cache.delete(observable)),\n          share({resetOnRefCountZero: () => timer(0, asapScheduler)}),\n        ),\n        getSnapshot: (initialValue) => {\n          if (state.error) {\n            throw state.error\n          }\n          return (\n            state.didEmit ? state.snapshot : getValue(initialValue)\n          ) as ObservedValueOf<ObservableType>\n        },\n      }\n\n      // Eagerly subscribe to sync set `state.snapshot` to what the observable returns, and keep the observable alive until the component unmounts.\n      const subscription = entry.observable.subscribe()\n      subscription.unsubscribe()\n\n      cache.set(observable, entry)\n    }\n    return cache.get(observable)!\n  }, [observable])\n\n  const subscribe = useCallback(\n    (onStoreChange: () => void) => {\n      if (disabled) {\n        return () => {}\n      }\n\n      const subscription = instance.observable.subscribe(onStoreChange)\n      return () => {\n        subscription.unsubscribe()\n      }\n    },\n    [instance.observable, disabled],\n  )\n\n  return useSyncExternalStore<ObservedValueOf<ObservableType>>(\n    subscribe,\n    () => {\n      return instance.getSnapshot(initialValue)\n    },\n    typeof initialValue === 'undefined'\n      ? undefined\n      : () => getValue(initialValue) as ObservedValueOf<ObservableType>,\n  )\n}\n","import {observableCallback} from 'observable-callback'\nimport {useEffect, useState} from 'react'\nimport {type Observable} from 'rxjs'\nimport {useEffectEvent} from 'use-effect-event'\n\n/** @public */\nexport function useObservableEvent<T, U>(\n  handleEvent: (arg: Observable<T>) => Observable<U>,\n): (arg: T) => void {\n  const [[calls$, call]] = useState(() => observableCallback<T>())\n\n  const onEvent = useEffectEvent((observable: Observable<T>) => handleEvent(observable))\n\n  useEffect(() => {\n    const subscription = calls$.pipe((observable) => onEvent(observable)).subscribe()\n    return () => subscription.unsubscribe()\n  }, [calls$])\n\n  return 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