matterbridge-dyson-robot/dist/async-eventemitter.js

A Matterbridge plugin that connects Dyson robot vacuums and air treatment devices to the Matter smart home ecosystem via their local or cloud MQTT APIs.

// Matterbridge plugin for Dyson robot vacuum and air treatment devices
// Copyright © 2025 Alexander Thoukydides
import { EventEmitter } from 'events';
// Node doesn't use DOMException for AbortError...
class AbortError extends Error {
    constructor(cause) {
        super('The operation was aborted', { cause });
        this.name = 'AbortError';
    }
}
// An EventEmitter with well-behaved Promisified listeners
export class AsyncEventEmitter extends EventEmitter {
    // Typed event.once() that ignores unrelated errors
    async onceAsync(eventName, signal) {
        // Handle already-aborted signal immediately
        if (signal?.aborted)
            throw new AbortError(signal.reason);
        // Otherwise return a promise that...
        return new Promise((resolve, reject) => {
            // ... resolves when the event occurs
            const resolver = ((...args) => {
                signal?.removeEventListener('abort', abortListener);
                resolve(args);
            });
            this.once(eventName, resolver);
            // ... or rejects if the signal is aborted
            const abortListener = () => {
                this.off(eventName, resolver);
                reject(new AbortError(signal?.reason));
            };
            signal?.addEventListener('abort', abortListener, { once: true });
        });
    }
}
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