@reactivex/ix-esnext-esm/asynciterable/operators/tap.js

The Interactive Extensions for JavaScript

import { AsyncIterableX } from '../asynciterablex';
import { toObserver } from '../../util/toobserver';
import { wrapWithAbort } from './withabort';
import { AbortError, throwIfAborted } from '../../aborterror';
export class TapAsyncIterable extends AsyncIterableX {
    constructor(source, observer) {
        super();
        this._source = source;
        this._observer = observer;
    }
    async *[Symbol.asyncIterator](signal) {
        throwIfAborted(signal);
        const source = wrapWithAbort(this._source, signal);
        const it = source[Symbol.asyncIterator]();
        while (1) {
            let next;
            try {
                next = await it.next();
            }
            catch (e) {
                if (e instanceof AbortError) {
                    throw e;
                }
                if (this._observer.error) {
                    await this._observer.error(e);
                }
                throw e;
            }
            if (next.done) {
                if (this._observer.complete) {
                    await this._observer.complete();
                }
                break;
            }
            if (this._observer.next) {
                await this._observer.next(next.value);
            }
            yield next.value;
        }
    }
}
/**
 * Invokes an action for each element in the async-iterable sequence, and propagates all observer
 * messages through the result sequence. This method can be used for debugging, logging, etc. by
 * intercepting the message stream to run arbitrary actions for messages on the pipeline.
 *
 * @export
 * @template TSource The type of the elements in the source sequence.
 * @param {(PartialAsyncObserver<TSource> | ((value: TSource) => any) | null)} [observerOrNext] Observer whose methods to invoke as
 * part of the source sequence's observation or a function to invoke for each element in the async-iterable sequence.
 * @param {(((err: any) => any) | null)} [error] Function to invoke upon exceptional termination of the async-iterable sequence.
 * @param {((() => any) | null)} [complete] Function to invoke upon graceful termination of the async-iterable sequence.
 * @returns {MonoTypeOperatorAsyncFunction<TSource>} The source sequence with the side-effecting behavior applied.
 */
export function tap(observerOrNext, error, complete) {
    return function tapOperatorFunction(source) {
        return new TapAsyncIterable(source, toObserver(observerOrNext, error, complete));
    };
}

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