json-crdt-repo/lib/util/rx/shareByKey.js

JSON CRDT server and syncing local-first browser client

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.shareByKey = void 0;
const rxjs_1 = require("rxjs");
const shareByKey = (sub) => {
    const map = {};
    return (key) => {
        const observable = map[key];
        if (observable)
            return observable;
        return (map[key] = (0, rxjs_1.defer)(() => sub(key)).pipe((0, rxjs_1.finalize)(() => {
            delete map[key];
        }), (0, rxjs_1.share)({
            resetOnRefCountZero: true,
        })));
    };
};
exports.shareByKey = shareByKey;