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

The Interactive Extensions for JavaScript

import { AsyncIterableX } from '../asynciterablex';
import { wrapWithAbort } from './withabort';
import { throwIfAborted } from '../../aborterror';
const DONE_PROMISE_VALUE = undefined;
export class TakeUntilAsyncIterable extends AsyncIterableX {
    constructor(source, other) {
        super();
        this._source = source;
        this._other = other;
    }
    async *[Symbol.asyncIterator](signal) {
        throwIfAborted(signal);
        const donePromise = this._other(signal).then(() => DONE_PROMISE_VALUE);
        const itemsAsyncIterator = wrapWithAbort(this._source, signal)[Symbol.asyncIterator]();
        for (;;) {
            const itemPromise = itemsAsyncIterator.next();
            const result = await Promise.race([donePromise, itemPromise]);
            if (result === DONE_PROMISE_VALUE || result.done) {
                break;
            }
            yield result.value;
        }
    }
}
/**
 * Returns the elements from the source async-iterable sequence until the other function
 * that returns a promise produces an element.
 *
 * @export
 * @template TSource The type of the elements in the source sequence.
 * @param {(signal?: AbortSignal) => Promise<any>} other A function that terminates the propagation of
 * elements in the source sequence.
 * @returns {MonoTypeOperatorAsyncFunction<TSource>} An async-iterable sequence containing the elements of the
 * source sequence up to the point the other function which returns a promise interrupted further propagation.
 */
export function takeUntil(other) {
    return function takeUntilOperatorFunction(source) {
        return new TakeUntilAsyncIterable(source, other);
    };
}

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