index.js•1.61 kB
const { EventEmitter } = require("events");
class AbortSignal {
constructor() {
this.eventEmitter = new EventEmitter();
this.onabort = null;
this.aborted = false;
this.reason = undefined;
}
toString() {
return "[object AbortSignal]";
}
get [Symbol.toStringTag]() {
return "AbortSignal";
}
removeEventListener(name, handler) {
this.eventEmitter.removeListener(name, handler);
}
addEventListener(name, handler) {
this.eventEmitter.on(name, handler);
}
dispatchEvent(type) {
const event = { type, target: this };
const handlerName = `on${type}`;
if (typeof this[handlerName] === "function") this[handlerName](event);
this.eventEmitter.emit(type, event);
}
throwIfAborted() {
if (this.aborted) {
throw this.reason;
}
}
static abort(reason) {
const controller = new AbortController();
controller.abort();
return controller.signal;
}
static timeout(time) {
const controller = new AbortController();
setTimeout(() => controller.abort(new Error("TimeoutError")), time);
return controller.signal;
}
}
class AbortController {
constructor() {
this.signal = new AbortSignal();
}
abort(reason) {
if (this.signal.aborted) return;
this.signal.aborted = true;
if (reason) this.signal.reason = reason;
else this.signal.reason = new Error("AbortError");
this.signal.dispatchEvent("abort");
}
toString() {
return "[object AbortController]";
}
get [Symbol.toStringTag]() {
return "AbortController";
}
}
module.exports = { AbortController, AbortSignal };