/**
 * #3851: stdout/stderr writes to a pipe are asynchronous on POSIX, so the
 * `process.exit()` calls that follow a command (bin wrappers, CLI.run error
 * paths, commands that exit themselves) discard whatever the consumer has not
 * read yet, i.e. everything past the pipe buffer (64 KiB). Switching the pipe
 * handles to blocking mode makes every write complete before it returns, so
 * every exit path is safe. Same technique as the MCP stdio server.
 * Files and TTYs are already synchronous and are left alone.
 */
export declare function ensureBlockingStdio(): void;
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