ix/asynciterable/defer.js

The Interactive Extensions for JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.defer = void 0;
const tslib_1 = require("tslib");
const asynciterablex_js_1 = require("./asynciterablex.js");
const withabort_js_1 = require("./operators/withabort.js");
const aborterror_js_1 = require("../aborterror.js");
class DeferAsyncIterable extends asynciterablex_js_1.AsyncIterableX {
    constructor(fn) {
        super();
        this._fn = fn;
    }
    [Symbol.asyncIterator](signal) {
        return tslib_1.__asyncGenerator(this, arguments, function* _a() {
            var _b, e_1, _c, _d;
            (0, aborterror_js_1.throwIfAborted)(signal);
            const items = yield tslib_1.__await(this._fn(signal));
            try {
                for (var _e = true, _f = tslib_1.__asyncValues((0, withabort_js_1.wrapWithAbort)(items, signal)), _g; _g = yield tslib_1.__await(_f.next()), _b = _g.done, !_b; _e = true) {
                    _d = _g.value;
                    _e = false;
                    const item = _d;
                    yield yield tslib_1.__await(item);
                }
            }
            catch (e_1_1) { e_1 = { error: e_1_1 }; }
            finally {
                try {
                    if (!_e && !_b && (_c = _f.return)) yield tslib_1.__await(_c.call(_f));
                }
                finally { if (e_1) throw e_1.error; }
            }
        });
    }
}
/**
 * Returns an async-iterable sequence that invokes the specified factory function whenever a call to [Symbol.asyncIterator] has been made.
 *
 * @template TSource The type of the elements in the sequence returned by the factory function, and in the resulting sequence.
 * @param {((signal?: AbortSignal) => AsyncIterable<TSource> | Promise<AsyncIterable<TSource>>)} factory Async-iterable factory function to
 * invoke for each call to [Symbol.asyncIterator].
 * @returns {AsyncIterableX<TSource>} An async-iterable sequence whose observers trigger an invocation of the given async-iterable factory function.
 */
function defer(factory) {
    return new DeferAsyncIterable(factory);
}
exports.defer = defer;

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