@platform/state/lib/TreeState/TreeState.events.mjs

A small, simple, strongly typed, [rx/observable] state-machine.

import { rx } from '@platform/util.value';
import { filter, map, share, takeUntil } from 'rxjs/operators';
export function create(args) {
    const $ = args.event$.pipe(takeUntil(args.until$));
    const changed$ = $.pipe(filter((e) => e.type === 'TreeState/changed'), map((e) => e.payload), share());
    const patched$ = $.pipe(filter((e) => e.type === 'TreeState/patched'), map((e) => e.payload), share());
    const childAdded$ = $.pipe(filter((e) => e.type === 'TreeState/child/added'), map((e) => e.payload), share());
    const childRemoved$ = $.pipe(filter((e) => e.type === 'TreeState/child/removed'), map((e) => e.payload), share());
    return {
        $,
        changed$,
        patched$,
        childAdded$,
        childRemoved$,
        payload: (type) => rx.payload($, type),
    };
}