/** Narrow a value to a thenable so a rejection handler can be attached. */
export declare function isThenable(value: unknown): value is PromiseLike<unknown>;
/**
 * Send a message to a Bun subprocess over IPC, neutralizing both the
 * synchronous throw ("cannot be used after the process has exited") and any
 * asynchronous rejection (EPIPE from a pipe that broke between exit being
 * observed and the next `send()`). The dead worker is detected separately via
 * `onExit`/`onError` and respawned or disabled by the owning client; an
 * un-awaited EPIPE rejection must not escape as a fatal unhandled rejection
 * that takes down the whole session. See issue #2997.
 *
 * `label` prefixes the debug log on synchronous failure (e.g. "tts").
 */
export declare function safeSend(proc: {
    send(message: unknown): unknown;
}, message: unknown, label: string): void;