chore: consolidate new foundation and archive v1 (#1495)
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---
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category: '@RxJS'
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---
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# watchExtractedObservable
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Watch the values of an RxJS [`Observable`](https://rxjs.dev/guide/observable) as extracted from one or more composables.
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Automatically unsubscribe on observable change, and automatically unsubscribe from it when the component is unmounted.
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Supports all overloads of [`watch`](https://vuejs.org/guide/essentials/watchers.html#basic-example).
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## Usage
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<!-- TODO: import rxjs error if enable twoslash -->
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```ts no-twoslash
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import { watchExtractedObservable } from '@vueuse/rxjs';
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import { computed, reactive, useTemplateRef } from 'vue';
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import { AudioPlayer } from '../my/libs/AudioPlayer';
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// setup()
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const audio = useTemplateRef('audio');
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const player = computed(() => (audio.value ? new AudioPlayer(audio.value) : null));
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const state = reactive({
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progress: 0,
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});
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watchExtractedObservable(
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player,
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(p) => p.progress$,
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(percentage) => {
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state.progress = percentage * 100;
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},
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);
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```
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If you want to add custom error handling to an `Observable` that might error, you can supply an optional `onError` configuration. Without this, RxJS will treat any error in the supplied `Observable` as an "unhandled error" and it will be thrown in a new call stack and reported to `window.onerror` (or `process.on('error')` if you happen to be in Node).
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You can also supply an optional `onComplete` configuration if you need to attach special behavior when the watched observable completes.
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```ts no-twoslash
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import { watchExtractedObservable } from '@vueuse/rxjs';
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import { computed, reactive, useTemplateRef } from 'vue';
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import { AudioPlayer } from '../my/libs/AudioPlayer';
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// setup()
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const audio = useTemplateRef('audio');
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const player = computed(() => (audio.value ? new AudioPlayer(audio.value) : null));
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const state = reactive({
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progress: 0,
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});
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watchExtractedObservable(
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player,
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(p) => p.progress$,
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(percentage) => {
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state.progress = percentage * 100;
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},
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{
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onError: (err: unknown) => {
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console.error(err);
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},
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onComplete: () => {
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state.progress = 100; // or 0, or whatever
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},
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},
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);
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```
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If you want, you can also pass `watch` options as the last argument:
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```ts no-twoslash
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import { watchExtractedObservable } from '@vueuse/rxjs';
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import { computed, reactive, useTemplateRef } from 'vue';
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import { AudioPlayer } from '../my/libs/AudioPlayer';
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// setup()
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const audio = useTemplateRef('audio');
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const player = computed(() => (audio.value ? new AudioPlayer(audio.value) : null));
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const state = reactive({
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progress: 0,
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});
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watchExtractedObservable(
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player,
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(p) => p.progress$,
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(percentage) => {
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state.progress = percentage * 100;
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},
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{
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onError: (err: unknown) => {
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console.error(err);
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},
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},
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{
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immediate: true,
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},
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);
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```
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## Type Declarations
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```ts
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export type OnCleanup = (cleanupFn: () => void) => void;
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export type WatchExtractedObservableCallback<Value, OldValue, ObservableElement> = (
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value: NonNullable<Value>,
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oldValue: OldValue,
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onCleanup: OnCleanup,
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) => Observable<ObservableElement>;
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export interface WatchExtractedObservableOptions {
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onError?: (err: unknown) => void;
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onComplete?: () => void;
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}
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export declare function watchExtractedObservable<
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T extends MultiWatchSources,
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E,
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Immediate extends Readonly<boolean> = false,
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>(
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sources: [...T],
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extractor: WatchExtractedObservableCallback<MapSources<T>, MapOldSources<T, Immediate>, E>,
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callback: (snapshot: E) => void,
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subscriptionOptions?: WatchExtractedObservableOptions,
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watchOptions?: WatchOptions<Immediate>,
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): WatchHandle;
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export declare function watchExtractedObservable<
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T extends Readonly<MultiWatchSources>,
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E,
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Immediate extends Readonly<boolean> = false,
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>(
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source: T,
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extractor: WatchExtractedObservableCallback<MapSources<T>, MapOldSources<T, Immediate>, E>,
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callback: (snapshot: E) => void,
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subscriptionOptions?: WatchExtractedObservableOptions,
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watchOptions?: WatchOptions<Immediate>,
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): WatchHandle;
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export declare function watchExtractedObservable<T, E, Immediate extends Readonly<boolean> = false>(
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source: WatchSource<T>,
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extractor: WatchExtractedObservableCallback<T, Immediate extends true ? T | undefined : T, E>,
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callback: (snapshot: E) => void,
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subscriptionOptions?: WatchExtractedObservableOptions,
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watchOptions?: WatchOptions<Immediate>,
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): WatchHandle;
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export declare function watchExtractedObservable<
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T extends object,
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E,
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Immediate extends Readonly<boolean> = false,
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>(
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source: T,
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extractor: WatchExtractedObservableCallback<T, Immediate extends true ? T | undefined : T, E>,
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callback: (snapshot: E) => void,
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subscriptionOptions?: WatchExtractedObservableOptions,
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watchOptions?: WatchOptions<Immediate>,
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): WatchHandle;
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```
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