@helenejs/react/lib/hooks/use-count.js

Real-time Web Apps for Node.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.useCount = useCount;
const react_1 = require("react");
const use_object_1 = require("./use-object");
const data_1 = require("@helenejs/data");
function useCount(collection, filter) {
    const [data, setData] = (0, react_1.useState)(null);
    (0, react_1.useEffect)(() => {
        if (!collection)
            return;
        async function onUpdated() {
            const result = await collection.count(filter);
            setData(result);
        }
        onUpdated().catch(console.error);
        collection.on(data_1.CollectionEvent.READY, onUpdated);
        collection.on(data_1.CollectionEvent.UPDATED, onUpdated);
        return () => {
            collection.off(data_1.CollectionEvent.READY, onUpdated);
            collection.off(data_1.CollectionEvent.UPDATED, onUpdated);
        };
    }, [collection, (0, use_object_1.useObject)(filter)]);
    return data;
}
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