/**
 * Suppress EPIPE-class crashes on process.stdout / process.stderr.
 *
 * When botmux runs under pm2, the daemon's and each worker's stdout/stderr are
 * pipes to the pm2 God daemon (→ out_file / error_file). If the reader end
 * detaches — pm2 log streaming stops, the God daemon restarts, `botmux logs`
 * is piped to a command that exits early (e.g. `| head`), or the terminal
 * closes mid-stream — the next write fails with EPIPE. Because a piped
 * stdout/stderr is a Socket, the failed write surfaces as an 'error' event;
 * with no listener Node escalates it to an uncaughtException.
 *
 * That is fatal for botmux: the daemon registers no global uncaughtException
 * handler (so a broken pipe would kill the whole daemon), and the worker's
 * handler calls process.exit(1) on any uncaught error (so a broken pipe would
 * take down a live CLI session). The real logs are captured by pm2's out/err
 * files regardless, so the correct behavior is to drop the failed write
 * silently and keep running rather than crash.
 *
 * Attaching an 'error' listener that ignores the broken-pipe family achieves
 * exactly that. Genuinely unexpected stream errors are re-thrown so they still
 * surface (i.e. behavior for non-broken-pipe errors is unchanged).
 */
/** True if `err` is a broken-pipe-class stream error that is safe to swallow. */
export declare function isIgnorableStreamError(err: NodeJS.ErrnoException | null | undefined): boolean;
/**
 * Attach a broken-pipe-tolerant 'error' listener to a single stream. Exported
 * for unit testing with an injected EventEmitter.
 */
export declare function attachStreamErrorGuard(stream: NodeJS.EventEmitter): void;
/**
 * Install the guard on process.stdout/stderr. Idempotent — safe to call from
 * multiple entry points (daemon, worker). Returns true if it installed this
 * call, false if it was already installed.
 *
 * `streams` defaults to the real process streams; it is parameterized only so
 * unit tests can inject fakes without touching the test runner's own stdio.
 */
export declare function installStdioEpipeGuard(streams?: NodeJS.EventEmitter[]): boolean;
//# sourceMappingURL=stdio-epipe-guard.d.ts.map