import type { UITextSpan } from "../../miscellaneous/text-span/UITextSpan";
import type { UITextChunk } from "./UIText.Interfaces";
/**
 * Detects the directional class used to order a chunk among its neighbours.
 * Digit only chunks are ordered left to right in both paragraph directions.
 * @param text Chunk text
 * @returns Directional class of the chunk
 */
export declare function detectBidiClass(text: string): number;
/**
 * Detects the paragraph direction of the content.
 * Implements a simplified UAX#9 P2/P3: the first strong character of the content wins.
 * @param textSpans Text spans in logical order
 * @returns Whether the paragraph reads right to left
 */
export declare function detectIsRTL(textSpans: UITextSpan[]): boolean;
/**
 * Reorders chunks from logical order into visual left to right order.
 * Implements UAX#9 L2 at chunk granularity with simplified neutral resolution (N1/N2).
 * Shaping and bidi inside a single chunk are handled by the canvas itself.
 * @param textChunks Chunks of a single line in logical order
 * @param isRTL Whether the paragraph reads right to left
 * @returns Chunks in visual order, or the same array when reordering is not needed
 */
export declare function reorderChunksVisually(textChunks: UITextChunk[], isRTL: boolean): UITextChunk[];