export declare function stripAnsi(text: string): string;
/**
 * Columns to reserve when laying a string out. Conservative by design — see
 * `ui-core/rendering/text-width.ts` for why it can exceed wcwidth.
 */
export declare function layoutWidth(text: string): number;
/** Columns a terminal is expected to paint. Never exceeds `layoutWidth`. */
export declare function displayWidth(text: string): number;
/**
 * Content width supplied by the classic shell.
 *
 * The caller has already removed the OpenTUI-style left/right shell padding;
 * block builders must therefore wrap to the width they receive rather than
 * subtracting another terminal gutter.
 */
export declare function contentWidth(columns: number): number;
export declare function blockRowCount(lines: readonly string[]): number;