/**
 * Parse a `--port` CLI value into a valid TCP port, or throw a friendly error.
 *
 * Without this, `--port` given as the final arg yields `parseInt(undefined) → NaN`, and
 * `app.listen(NaN)` throws `ERR_SOCKET_BAD_PORT`, crashing the process with an opaque stack
 * instead of a clear message.
 */
export declare function parsePort(raw: string | undefined): number;
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