export type StdioLineHandler = (stream: "stdout" | "stderr", line: string) => void;
/**
 * Tee `process.stdout` / `process.stderr`: every write still reaches the real
 * stream (the terminal is untouched), and each *completed* line is also handed to
 * `onLine`. Output is line-buffered — a partial write is held until its newline —
 * and a trailing partial line is flushed on restore so nothing is dropped.
 *
 * Entirely contained in this process: the returned function reinstates the
 * original `write`s, leaving no trace of the wrapping behind.
 */
export declare function teeStdio(onLine: StdioLineHandler): () => void;
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