ix/asynciterable/operators/finalize.mjs

The Interactive Extensions for JavaScript

import { __asyncGenerator, __asyncValues, __await } from "tslib";
import { AsyncIterableX } from '../asynciterablex.mjs';
import { wrapWithAbort } from './withabort.mjs';
import { throwIfAborted } from '../../aborterror.mjs';
/** @ignore */
export class FinallyAsyncIterable extends AsyncIterableX {
    constructor(source, action) {
        super();
        this._source = source;
        this._action = action;
    }
    [Symbol.asyncIterator](signal) {
        return __asyncGenerator(this, arguments, function* _a() {
            var _b, e_1, _c, _d;
            throwIfAborted(signal);
            try {
                try {
                    for (var _e = true, _f = __asyncValues(wrapWithAbort(this._source, signal)), _g; _g = yield __await(_f.next()), _b = _g.done, !_b; _e = true) {
                        _d = _g.value;
                        _e = false;
                        const item = _d;
                        yield yield __await(item);
                    }
                }
                catch (e_1_1) { e_1 = { error: e_1_1 }; }
                finally {
                    try {
                        if (!_e && !_b && (_c = _f.return)) yield __await(_c.call(_f));
                    }
                    finally { if (e_1) throw e_1.error; }
                }
            }
            finally {
                yield __await(this._action());
            }
        });
    }
}
/**
 *  Invokes a specified asynchronous action after the source async-iterable sequence terminates gracefully or exceptionally.
 *
 * @template TSource The type of the elements in the source sequence.
 * @param {(() => void | Promise<void>)} action Action to invoke and await asynchronously after the source async-iterable sequence terminates
 * @returns {MonoTypeOperatorAsyncFunction<TSource>} An operator that returns the source sequence with the
 * action-invoking termination behavior applied.
 */
export function finalize(action) {
    return function finalizeOperatorFunction(source) {
        return new FinallyAsyncIterable(source, action);
    };
}

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