@ohm-vision/react-async/dist/hooks/useEventSource.js

Extentions to React to support asynchronous calls

var __rest = (this && this.__rest) || function (s, e) {
    var t = {};
    for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
        t[p] = s[p];
    if (s != null && typeof Object.getOwnPropertySymbols === "function")
        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
            if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable.call(s, p[i]))
                t[p[i]] = s[p[i]];
        }
    return t;
};
var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
    if (pack || arguments.length === 2) for (var i = 0, l = from.length, ar; i < l; i++) {
        if (ar || !(i in from)) {
            if (!ar) ar = Array.prototype.slice.call(from, 0, i);
            ar[i] = from[i];
        }
    }
    return to.concat(ar || Array.prototype.slice.call(from));
};
import { useEffect, useRef, useState } from "react";
export function useEventSource(_a, deps) {
    var url = _a.url, withCredentials = _a.withCredentials, handlers = __rest(_a, ["url", "withCredentials"]);
    var _b = useState([]), events = _b[0], setEvents = _b[1];
    var handlerRef = useRef(handlers);
    useEffect(function () {
        var _a = handlerRef.current, open = _a.open, error = _a.error, message = __rest(_a, ["open", "error"]);
        var messages = Object.entries(message).reduce(function (curr, _a) {
            var key = _a[0], value = _a[1];
            curr[key] = function (_a) {
                var type = _a.type, dataStr = _a.data, lastEventId = _a.lastEventId, ports = _a.ports, source = _a.source, bubbles = _a.bubbles, cancelable = _a.cancelable, composed = _a.composed;
                var data;
                try {
                    data = JSON.parse(dataStr);
                }
                catch (_b) {
                    data = dataStr;
                }
                var event = new MessageEvent(type, {
                    data: data,
                    lastEventId: lastEventId,
                    origin: origin,
                    ports: ports ? __spreadArray([], ports, true) : undefined,
                    source: source,
                    bubbles: bubbles,
                    cancelable: cancelable,
                    composed: composed
                });
                onMessage(event);
            };
            return curr;
        }, {
            open: onOpen,
            error: onError
        });
        var source = new EventSource(url, {
            withCredentials: withCredentials
        });
        function onOpen(e) {
            setEvents([]);
            if (open) {
                open(e);
            }
        }
        function onError(e) {
            stopAndClose();
            if (error) {
                error(e);
            }
        }
        function onMessage(e) {
            // append the event
            setEvents(function (events) { return __spreadArray(__spreadArray([], events, true), [
                e
            ], false); });
        }
        function stopAndClose() {
            if (source.readyState !== EventSource.CLOSED) {
                source.close();
            }
        }
        return stopAndClose;
    }, __spreadArray([url, withCredentials, handlerRef], deps, true));
    return events;
}