@ceramicnetwork/core/lib/state-management/state-link.js

Typescript implementation of the Ceramic protocol

import { Observable, Subscription } from 'rxjs';
import { StreamStateSubject, StreamUtils, } from '@ceramicnetwork/common';
export class StateLink extends Observable {
    constructor(initial, update$) {
        super((subscriber) => {
            const update$S = update$
                ? update$(this.state$.value).subscribe(this.state$)
                : Subscription.EMPTY;
            this.state$.subscribe(subscriber).add(() => {
                update$S.unsubscribe();
            });
        });
        this.initial = initial;
        this.state$ = new StreamStateSubject(initial);
    }
    next(state) {
        this.state$.next(state);
    }
    get state() {
        return this.state$.value;
    }
    get value() {
        return this.state$.value;
    }
    get id() {
        return StreamUtils.streamIdFromState(this.state);
    }
}
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