@platform/state/lib/StateObject/StateObject.merge.js

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

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.create = void 0;
var operators_1 = require("rxjs/operators");
var common_1 = require("../common");
function create(factory) {
    return function (initial, dispose$) {
        var initialStateObjects = [];
        initial = Object.keys(initial).reduce(function (acc, key) {
            var value = initial[key];
            if (common_1.is.stateObject(value)) {
                acc[key] = value.state;
                initialStateObjects.push({ key: key, obj: value });
            }
            else {
                acc[key] = value;
            }
            return acc;
        }, {});
        var store = factory(initial);
        if (dispose$) {
            dispose$.subscribe(function () { return api.dispose(); });
        }
        var change = function (key, to) { return store.change(function (draft) { return (draft[key] = to); }); };
        var api = {
            store: store,
            get state() {
                return store.state;
            },
            get changed$() {
                return store.event.changed$;
            },
            add: function (key, subject) {
                var isObservable = common_1.is.observable(subject);
                var changed$ = isObservable
                    ? subject
                    : subject.event.changed$;
                if (!isObservable) {
                    var obj = subject;
                    change(key, obj.state);
                }
                changed$.pipe(operators_1.takeUntil(store.dispose$)).subscribe(function (e) { return change(key, e.to); });
                return api;
            },
            dispose: function () { return store.dispose(); },
        };
        initialStateObjects.forEach(function (_a) {
            var key = _a.key, obj = _a.obj;
            return api.add(key, obj);
        });
        return api;
    };
}
exports.create = create;