@reactivex/ix-es5-esm/asynciterable/combinelatest.js

The Interactive Extensions for JavaScript

import { __asyncGenerator, __await, __extends, __generator } from "tslib";
import { AsyncIterableX } from './asynciterablex.js';
import { identity } from '../util/identity.js';
import { wrapWithAbort } from './operators/withabort.js';
import { throwIfAborted } from '../aborterror.js';
import { safeRace } from '../util/safeRace.js';
// eslint-disable-next-line @typescript-eslint/no-empty-function
var NEVER_PROMISE = new Promise(function () { });
function wrapPromiseWithIndex(promise, index) {
    return promise.then(function (value) { return ({ value: value, index: index }); });
}
/** @ignore */
var CombineLatestAsyncIterable = /** @class */ (function (_super) {
    __extends(CombineLatestAsyncIterable, _super);
    function CombineLatestAsyncIterable(sources) {
        var _this = _super.call(this) || this;
        _this._sources = sources;
        return _this;
    }
    CombineLatestAsyncIterable.prototype[Symbol.asyncIterator] = function (signal) {
        return __asyncGenerator(this, arguments, function _a() {
            var length, iterators, nexts, hasValueAll, values, hasValues, active, i, iterator, next, _b, _c, value$, done$, index, iterator$;
            return __generator(this, function (_d) {
                switch (_d.label) {
                    case 0:
                        throwIfAborted(signal);
                        length = this._sources.length;
                        iterators = new Array(length);
                        nexts = new Array(length);
                        hasValueAll = false;
                        values = new Array(length);
                        hasValues = new Array(length);
                        active = length;
                        hasValues.fill(false);
                        for (i = 0; i < length; i++) {
                            iterator = wrapWithAbort(this._sources[i], signal)[Symbol.asyncIterator]();
                            iterators[i] = iterator;
                            nexts[i] = wrapPromiseWithIndex(iterator.next(), i);
                        }
                        _d.label = 1;
                    case 1:
                        if (!(active > 0)) return [3 /*break*/, 7];
                        next = safeRace(nexts);
                        return [4 /*yield*/, __await(next)];
                    case 2:
                        _b = _d.sent(), _c = _b.value, value$ = _c.value, done$ = _c.done, index = _b.index;
                        if (!done$) return [3 /*break*/, 3];
                        nexts[index] = NEVER_PROMISE;
                        active--;
                        return [3 /*break*/, 6];
                    case 3:
                        values[index] = value$;
                        hasValues[index] = true;
                        iterator$ = iterators[index];
                        nexts[index] = wrapPromiseWithIndex(iterator$.next(), index);
                        if (!(hasValueAll || (hasValueAll = hasValues.every(identity)))) return [3 /*break*/, 6];
                        return [4 /*yield*/, __await(values)];
                    case 4: return [4 /*yield*/, _d.sent()];
                    case 5:
                        _d.sent();
                        _d.label = 6;
                    case 6: return [3 /*break*/, 1];
                    case 7: return [2 /*return*/];
                }
            });
        });
    };
    return CombineLatestAsyncIterable;
}(AsyncIterableX));
export { CombineLatestAsyncIterable };
export function combineLatest() {
    var sources = [];
    for (var _i = 0; _i < arguments.length; _i++) {
        sources[_i] = arguments[_i];
    }
    return new CombineLatestAsyncIterable(sources);
}

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