'use strict';
/**
 * @license Angular v<unknown>
 * (c) 2010-2022 Google LLC. https://angular.io/
 * License: MIT
 */
/**
 * @fileoverview
 * @suppress {missingRequire}
 */
Zone.__load_patch('fetch', (global, Zone, api) => {
    let fetch = global['fetch'];
    if (typeof fetch !== 'function') {
        return;
    }
    const originalFetch = global[api.symbol('fetch')];
    if (originalFetch) {
        // restore unpatched fetch first
        fetch = originalFetch;
    }
    const ZoneAwarePromise = global.Promise;
    const symbolThenPatched = api.symbol('thenPatched');
    const fetchTaskScheduling = api.symbol('fetchTaskScheduling');
    const placeholder = function () { };
    global['fetch'] = function () {
        const args = Array.prototype.slice.call(arguments);
        const options = args.length > 1 ? args[1] : {};
        const signal = options && options.signal;
        const ac = new AbortController();
        const fetchSignal = ac.signal;
        options.signal = fetchSignal;
        args[1] = options;
        if (signal) {
            const nativeAddEventListener = signal[Zone.__symbol__('addEventListener')] || signal.addEventListener;
            nativeAddEventListener.call(signal, 'abort', function () {
                ac.abort();
            }, { once: true });
        }
        return new Promise((res, rej) => {
            const task = Zone.current.scheduleMacroTask('fetch', placeholder, { fetchArgs: args }, () => {
                let fetchPromise;
                let zone = Zone.current;
                try {
                    zone[fetchTaskScheduling] = true;
                    fetchPromise = fetch.apply(this, args);
                }
                catch (error) {
                    rej(error);
                    return;
                }
                finally {
                    zone[fetchTaskScheduling] = false;
                }
                if (!(fetchPromise instanceof ZoneAwarePromise)) {
                    let ctor = fetchPromise.constructor;
                    if (!ctor[symbolThenPatched]) {
                        api.patchThen(ctor);
                    }
                }
                fetchPromise.then((resource) => {
                    if (task.state !== 'notScheduled') {
                        task.invoke();
                    }
                    res(resource);
                }, (error) => {
                    if (task.state !== 'notScheduled') {
                        task.invoke();
                    }
                    rej(error);
                });
            }, () => {
                ac.abort();
            });
        });
    };
});