119 lines
3.2 KiB
JavaScript
119 lines
3.2 KiB
JavaScript
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/**
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* @author Toru Nagashima <https://github.com/mysticatea>
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* See LICENSE file in root directory for full license.
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*/
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import { EventTarget, defineEventAttribute } from 'event-target-shim';
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/**
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* The signal class.
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* @see https://dom.spec.whatwg.org/#abortsignal
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*/
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class AbortSignal extends EventTarget {
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/**
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* AbortSignal cannot be constructed directly.
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*/
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constructor() {
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super();
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throw new TypeError("AbortSignal cannot be constructed directly");
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}
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/**
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* Returns `true` if this `AbortSignal`'s `AbortController` has signaled to abort, and `false` otherwise.
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*/
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get aborted() {
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const aborted = abortedFlags.get(this);
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if (typeof aborted !== "boolean") {
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throw new TypeError(`Expected 'this' to be an 'AbortSignal' object, but got ${this === null ? "null" : typeof this}`);
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}
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return aborted;
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}
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}
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defineEventAttribute(AbortSignal.prototype, "abort");
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/**
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* Create an AbortSignal object.
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*/
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function createAbortSignal() {
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const signal = Object.create(AbortSignal.prototype);
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EventTarget.call(signal);
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abortedFlags.set(signal, false);
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return signal;
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}
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/**
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* Abort a given signal.
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*/
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function abortSignal(signal) {
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if (abortedFlags.get(signal) !== false) {
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return;
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}
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abortedFlags.set(signal, true);
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signal.dispatchEvent({ type: "abort" });
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}
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/**
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* Aborted flag for each instances.
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*/
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const abortedFlags = new WeakMap();
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// Properties should be enumerable.
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Object.defineProperties(AbortSignal.prototype, {
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aborted: { enumerable: true },
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});
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// `toString()` should return `"[object AbortSignal]"`
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if (typeof Symbol === "function" && typeof Symbol.toStringTag === "symbol") {
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Object.defineProperty(AbortSignal.prototype, Symbol.toStringTag, {
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configurable: true,
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value: "AbortSignal",
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});
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}
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/**
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* The AbortController.
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* @see https://dom.spec.whatwg.org/#abortcontroller
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*/
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class AbortController {
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/**
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* Initialize this controller.
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*/
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constructor() {
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signals.set(this, createAbortSignal());
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}
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/**
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* Returns the `AbortSignal` object associated with this object.
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*/
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get signal() {
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return getSignal(this);
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}
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/**
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* Abort and signal to any observers that the associated activity is to be aborted.
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*/
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abort() {
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abortSignal(getSignal(this));
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}
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}
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/**
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* Associated signals.
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*/
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const signals = new WeakMap();
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/**
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* Get the associated signal of a given controller.
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*/
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function getSignal(controller) {
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const signal = signals.get(controller);
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if (signal == null) {
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throw new TypeError(`Expected 'this' to be an 'AbortController' object, but got ${controller === null ? "null" : typeof controller}`);
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}
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return signal;
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}
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// Properties should be enumerable.
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Object.defineProperties(AbortController.prototype, {
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signal: { enumerable: true },
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abort: { enumerable: true },
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});
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if (typeof Symbol === "function" && typeof Symbol.toStringTag === "symbol") {
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Object.defineProperty(AbortController.prototype, Symbol.toStringTag, {
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configurable: true,
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value: "AbortController",
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});
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}
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export default AbortController;
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export { AbortController, AbortSignal };
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//# sourceMappingURL=abort-controller.mjs.map
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