@nativescript/core/abortcontroller/abortsignal.js

import { Observable } from '../data/observable';
/**
 * The signal class.
 * @see https://dom.spec.whatwg.org/#abortsignal
 */
export default class AbortSignal extends Observable {
    /**
     * AbortSignal cannot be constructed directly.
     */
    constructor() {
        super();
    }
    /**
     * Returns `true` if this `AbortSignal`'s `AbortController` has signaled to abort, and `false` otherwise.
     */
    get aborted() {
        const aborted = abortedFlags.get(this);
        if (typeof aborted !== 'boolean') {
            throw new TypeError(`Expected 'this' to be an 'AbortSignal' object, but got ${this === null ? 'null' : typeof this}`);
        }
        return aborted;
    }
}
/**
 * Create an AbortSignal object.
 */
export function createAbortSignal() {
    const signal = new AbortSignal();
    abortedFlags.set(signal, false);
    return signal;
}
/**
 * Abort a given signal.
 */
export function abortSignal(signal) {
    if (abortedFlags.get(signal) !== false) {
        return;
    }
    abortedFlags.set(signal, true);
    signal.notify({ eventName: 'abort', type: 'abort' });
}
/**
 * Aborted flag for each instances.
 */
const abortedFlags = new WeakMap();
// Properties should be enumerable.
Object.defineProperties(AbortSignal.prototype, {
    aborted: { enumerable: true },
});
// `toString()` should return `"[object AbortSignal]"`
if (typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol') {
    Object.defineProperty(AbortSignal.prototype, Symbol.toStringTag, {
        configurable: true,
        value: 'AbortSignal',
    });
}
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