type Sink = (chunk: string) => void;
/** Patch stdout/stderr. Idempotent; only the shell calls this. */
export declare function installOutputRouter(): void;
export declare function uninstallOutputRouter(): void;
/** Run `fn` with all of its console output captured by `sink`. */
export declare function runWithSink<T>(sink: Sink, fn: () => Promise<T>): Promise<T>;
/**
 * Write to the terminal even from inside a sink. The shell's own chrome
 * (prompt, job notices) must never be captured into a job's log.
 */
export declare function writeDirect(text: string): void;
export {};
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