abort-controller.mjs - buddy - node MVC discord bot

abort-controller.mjs (3311B)
      1 /**
      2  * @author Toru Nagashima <https://github.com/mysticatea>
      3  * See LICENSE file in root directory for full license.
      4  */
      5 import { EventTarget, defineEventAttribute } from 'event-target-shim';
      6 
      7 /**
      8  * The signal class.
      9  * @see https://dom.spec.whatwg.org/#abortsignal
     10  */
     11 class AbortSignal extends EventTarget {
     12     /**
     13      * AbortSignal cannot be constructed directly.
     14      */
     15     constructor() {
     16         super();
     17         throw new TypeError("AbortSignal cannot be constructed directly");
     18     }
     19     /**
     20      * Returns `true` if this `AbortSignal`'s `AbortController` has signaled to abort, and `false` otherwise.
     21      */
     22     get aborted() {
     23         const aborted = abortedFlags.get(this);
     24         if (typeof aborted !== "boolean") {
     25             throw new TypeError(`Expected 'this' to be an 'AbortSignal' object, but got ${this === null ? "null" : typeof this}`);
     26         }
     27         return aborted;
     28     }
     29 }
     30 defineEventAttribute(AbortSignal.prototype, "abort");
     31 /**
     32  * Create an AbortSignal object.
     33  */
     34 function createAbortSignal() {
     35     const signal = Object.create(AbortSignal.prototype);
     36     EventTarget.call(signal);
     37     abortedFlags.set(signal, false);
     38     return signal;
     39 }
     40 /**
     41  * Abort a given signal.
     42  */
     43 function abortSignal(signal) {
     44     if (abortedFlags.get(signal) !== false) {
     45         return;
     46     }
     47     abortedFlags.set(signal, true);
     48     signal.dispatchEvent({ type: "abort" });
     49 }
     50 /**
     51  * Aborted flag for each instances.
     52  */
     53 const abortedFlags = new WeakMap();
     54 // Properties should be enumerable.
     55 Object.defineProperties(AbortSignal.prototype, {
     56     aborted: { enumerable: true },
     57 });
     58 // `toString()` should return `"[object AbortSignal]"`
     59 if (typeof Symbol === "function" && typeof Symbol.toStringTag === "symbol") {
     60     Object.defineProperty(AbortSignal.prototype, Symbol.toStringTag, {
     61         configurable: true,
     62         value: "AbortSignal",
     63     });
     64 }
     65 
     66 /**
     67  * The AbortController.
     68  * @see https://dom.spec.whatwg.org/#abortcontroller
     69  */
     70 class AbortController {
     71     /**
     72      * Initialize this controller.
     73      */
     74     constructor() {
     75         signals.set(this, createAbortSignal());
     76     }
     77     /**
     78      * Returns the `AbortSignal` object associated with this object.
     79      */
     80     get signal() {
     81         return getSignal(this);
     82     }
     83     /**
     84      * Abort and signal to any observers that the associated activity is to be aborted.
     85      */
     86     abort() {
     87         abortSignal(getSignal(this));
     88     }
     89 }
     90 /**
     91  * Associated signals.
     92  */
     93 const signals = new WeakMap();
     94 /**
     95  * Get the associated signal of a given controller.
     96  */
     97 function getSignal(controller) {
     98     const signal = signals.get(controller);
     99     if (signal == null) {
    100         throw new TypeError(`Expected 'this' to be an 'AbortController' object, but got ${controller === null ? "null" : typeof controller}`);
    101     }
    102     return signal;
    103 }
    104 // Properties should be enumerable.
    105 Object.defineProperties(AbortController.prototype, {
    106     signal: { enumerable: true },
    107     abort: { enumerable: true },
    108 });
    109 if (typeof Symbol === "function" && typeof Symbol.toStringTag === "symbol") {
    110     Object.defineProperty(AbortController.prototype, Symbol.toStringTag, {
    111         configurable: true,
    112         value: "AbortController",
    113     });
    114 }
    115 
    116 export default AbortController;
    117 export { AbortController, AbortSignal };
    118 //# sourceMappingURL=abort-controller.mjs.map