103 lines
4.3 KiB
JavaScript
Executable File
103 lines
4.3 KiB
JavaScript
Executable File
'use strict';
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/**
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* @license Angular v<unknown>
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* (c) 2010-2025 Google LLC. https://angular.io/
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* License: MIT
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*/
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/**
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* @fileoverview
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* @suppress {missingRequire}
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*/
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function patchFetch(Zone) {
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Zone.__load_patch('fetch', (global, Zone, api) => {
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let fetch = global['fetch'];
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if (typeof fetch !== 'function') {
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return;
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}
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const originalFetch = global[api.symbol('fetch')];
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if (originalFetch) {
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// restore unpatched fetch first
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fetch = originalFetch;
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}
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const ZoneAwarePromise = global.Promise;
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const symbolThenPatched = api.symbol('thenPatched');
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const fetchTaskScheduling = api.symbol('fetchTaskScheduling');
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const OriginalResponse = global.Response;
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const placeholder = function () { };
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const createFetchTask = (source, data, originalImpl, self, args, ac) => new Promise((resolve, reject) => {
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const task = Zone.current.scheduleMacroTask(source, placeholder, data, () => {
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// The promise object returned by the original implementation passed into the
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// function. This might be a `fetch` promise, `Response.prototype.json` promise,
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// etc.
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let implPromise;
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let zone = Zone.current;
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try {
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zone[fetchTaskScheduling] = true;
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implPromise = originalImpl.apply(self, args);
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}
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catch (error) {
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reject(error);
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return;
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}
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finally {
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zone[fetchTaskScheduling] = false;
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}
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if (!(implPromise instanceof ZoneAwarePromise)) {
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let ctor = implPromise.constructor;
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if (!ctor[symbolThenPatched]) {
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api.patchThen(ctor);
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}
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}
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implPromise.then((resource) => {
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if (task.state !== 'notScheduled') {
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task.invoke();
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}
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resolve(resource);
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}, (error) => {
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if (task.state !== 'notScheduled') {
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task.invoke();
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}
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reject(error);
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});
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}, () => {
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ac?.abort();
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});
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});
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global['fetch'] = function () {
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const args = Array.prototype.slice.call(arguments);
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const options = args.length > 1 ? args[1] : {};
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const signal = options?.signal;
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const ac = new AbortController();
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const fetchSignal = ac.signal;
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options.signal = fetchSignal;
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args[1] = options;
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let onAbort;
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if (signal) {
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const nativeAddEventListener = signal[Zone.__symbol__('addEventListener')] ||
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signal.addEventListener;
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onAbort = () => ac.abort();
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nativeAddEventListener.call(signal, 'abort', onAbort, { once: true });
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}
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return createFetchTask('fetch', { fetchArgs: args }, fetch, this, args, ac).finally(() => {
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// We need to be good citizens and remove the `abort` listener once
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// the fetch is settled. The `abort` listener may not be called at all,
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// which means the event listener closure would retain a reference to
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// the `ac` object even if it goes out of scope. Since browser's garbage
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// collectors work differently, some may not be smart enough to collect a signal.
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signal?.removeEventListener('abort', onAbort);
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});
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};
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if (OriginalResponse?.prototype) {
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// https://fetch.spec.whatwg.org/#body-mixin
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['arrayBuffer', 'blob', 'formData', 'json', 'text']
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// Safely check whether the method exists on the `Response` prototype before patching.
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.filter((method) => typeof OriginalResponse.prototype[method] === 'function')
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.forEach((method) => {
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api.patchMethod(OriginalResponse.prototype, method, (delegate) => (self, args) => createFetchTask(`Response.${method}`, undefined, delegate, self, args, undefined));
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});
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}
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});
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}
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patchFetch(Zone);
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