@stringsync/vexml/dist/esm/events/topic.js

MusicXML to Vexflow

/** Class that tracks pubsub subscribers. */
export class Topic {
    id = 0;
    subscriptions = new Array();
    hasSubscribers(name) {
        return this.subscriptions.some((s) => s.name === name);
    }
    publish(name, payload) {
        this.subscriptions.filter((s) => s.name === name).forEach((s) => s.listener(payload));
    }
    subscribe(name, listener) {
        const id = this.id++;
        this.subscriptions.push({ id, name, listener: listener });
        return id;
    }
    unsubscribe(id) {
        const subscription = this.subscriptions.find((s) => s.id === id) ?? null;
        this.subscriptions = this.subscriptions.filter((s) => s.id !== id);
        return subscription;
    }
    unsubscribeAll() {
        this.subscriptions = [];
    }
}