@thi.ng/transducers-async/pubsub.d.ts

Async versions of various highly composable transducers, reducers and iterators

import type { Fn } from "@thi.ng/api";
import { MSub } from "./mult.js";
export declare const pubsub: <K, V>(src: AsyncIterable<V>, topicFn: Fn<V, K>) => PubSub<K, V>;
export declare class PubSub<K, V> {
    src: AsyncIterable<V>;
    topicFn: Fn<V, K>;
    protected topics: Map<K, MSub<V>[]>;
    protected isActive: boolean;
    constructor(src: AsyncIterable<V>, topicFn: Fn<V, K>);
    /**
     * Creates a new subscription (aka custom `AsyncIterable`) which will
     * receive any future values from `src` matching given topic `id`. The
     * returned subscription can be removed again via
     * {@link PubSub.unsubscribeTopic}.
     */
    subscribeTopic(id: K): AsyncIterable<V>;
    /**
     * Similar to {@link PubSub.subscribeTopic}, but for one-off event handling.
     * Creates a new subscription for topic `id` and waits for next value. Once
     * received, it immediately unsubscribes again and then calls `fn` with
     * value.
     *
     * @param id
     * @param fn
     */
    subscribeOnce(id: K, fn: Fn<V, void>): void;
    /**
     * Attempts to remove given child subscription (presumably created via
     * {@link PubSub.subscribeTopic}). Returns true if removal was successful.
     *
     * @param sub
     */
    unsubscribeTopic(id: K, sub: AsyncIterable<V>): boolean;
    protected process(): Promise<void>;
}
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