rxdeep/dist/es6/persistent.js

RxJS deep state management

import { merge } from 'rxjs';
import { tap, filter } from 'rxjs/operators';
import { State } from './state';
export class PersistentState extends State {
    constructor(state, storage, transform) {
        super(state.value, merge(state.downstream, state.downstream.pipe(filter(change => this._received !== change.value), transform || (_ => _), tap(change => {
            this._received = change.value;
            storage.save(change.value);
        }), filter(() => false)), storage.load().pipe(tap(value => {
            this._received = value;
            this.next(value);
        }), filter(() => false))), state.upstream);
        this.state = state;
        this.storage = storage;
        this.transform = transform;
    }
}
export function persistent(state, storage) {
    return new PersistentState(state, storage);
}
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