@benev/slate/x/tools/pub.js

frontend web stuff

/** @deprecated use `pubsub` instead */
export function pub() {
    const listeners = new Set();
    function subscribe(listener) {
        listeners.add(listener);
        return () => void listeners.delete(listener);
    }
    subscribe.publish = (x) => {
        for (const listener of listeners)
            listener(x);
    };
    subscribe.clear = () => listeners.clear();
    subscribe.once = (listener) => {
        const actual_listener = (x) => {
            listener(x);
            listeners.delete(actual_listener);
        };
        listeners.add(actual_listener);
        return () => void listeners.delete(actual_listener);
    };
    return subscribe;
}
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