element-web-Github/playwright/plugins/utils/port.ts

/*
Copyright 2024 New Vector Ltd.
Copyright 2022 The Matrix.org Foundation C.I.C.

SPDX-License-Identifier: AGPL-3.0-only OR GPL-3.0-only
Please see LICENSE files in the repository root for full details.
*/

import * as net from "net";

export async function getFreePort(): Promise<number> {
    return new Promise<number>((resolve) => {
        const srv = net.createServer();
        srv.listen(0, () => {
            const port = (<net.AddressInfo>srv.address()).port;
            srv.close(() => resolve(port));
        });
    });
}