import React from 'react';
export declare const MAX_STREAM_DISPLAY_CHARS = 480;
/** Fixed layout height of the live tool-stream tail for scroll-range math. */
export declare function toolStreamBoxHeight(name: string): number;
/**
 * Build the CONSTANT-height content block for the live tool-stream box: always
 * exactly `maxLines` rows, newest-pinned-to-bottom, every line truncated to
 * `contentWidth` so nothing wraps. Holding the row count fixed is what stops the
 * live region from growing (and thus scrolling the terminal + leaking the header
 * into scrollback) as output streams in. Pure + exported for testing.
 */
export declare function streamBoxRows(text: string, maxLines: number, contentWidth: number): Array<{
    text: string;
    italic?: boolean | undefined;
}>;
export declare const ToolStreamBox: React.MemoExoticComponent<({ name, text, startedAt, termWidth, }: {
    name: string;
    text: string;
    startedAt: number;
    termWidth: number;
}) => React.ReactElement>;
export declare function tailForDisplay(text: string, maxChars: number): string;
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