@reactivex/ix-es5-esm/asynciterable/operators/takeuntil.js

The Interactive Extensions for JavaScript

import { __asyncGenerator, __await, __extends, __generator } from "tslib";
import { AsyncIterableX } from '../asynciterablex.js';
import { wrapWithAbort } from './withabort.js';
import { throwIfAborted } from '../../aborterror.js';
import { safeRace } from '../../util/safeRace.js';
var DONE_PROMISE_VALUE = undefined;
/** @ignore */
var TakeUntilAsyncIterable = /** @class */ (function (_super) {
    __extends(TakeUntilAsyncIterable, _super);
    function TakeUntilAsyncIterable(source, other) {
        var _this = _super.call(this) || this;
        _this._source = source;
        _this._other = other;
        return _this;
    }
    TakeUntilAsyncIterable.prototype[Symbol.asyncIterator] = function (signal) {
        return __asyncGenerator(this, arguments, function _a() {
            var donePromise, itemsAsyncIterator, itemPromise, result;
            return __generator(this, function (_b) {
                switch (_b.label) {
                    case 0:
                        throwIfAborted(signal);
                        donePromise = this._other(signal).then(function () { return DONE_PROMISE_VALUE; });
                        itemsAsyncIterator = wrapWithAbort(this._source, signal)[Symbol.asyncIterator]();
                        _b.label = 1;
                    case 1:
                        itemPromise = itemsAsyncIterator.next();
                        return [4 /*yield*/, __await(safeRace([donePromise, itemPromise]))];
                    case 2:
                        result = _b.sent();
                        if (result === DONE_PROMISE_VALUE || result.done) {
                            return [3 /*break*/, 6];
                        }
                        return [4 /*yield*/, __await(result.value)];
                    case 3: return [4 /*yield*/, _b.sent()];
                    case 4:
                        _b.sent();
                        _b.label = 5;
                    case 5: return [3 /*break*/, 1];
                    case 6: return [2 /*return*/];
                }
            });
        });
    };
    return TakeUntilAsyncIterable;
}(AsyncIterableX));
export { TakeUntilAsyncIterable };
/**
 * Returns the elements from the source async-iterable sequence until the other function
 * that returns a promise produces an element.
 *
 * @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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