import type { Cell } from '@fortune-sheet/core';
import { type XlsxSemanticColorOrigin } from './work-xlsx-cell-style-origin';
import type { SpreadsheetUnderlineCellValue } from './work-spreadsheet-underline';
export declare const MAX_XLSX_RICH_TEXT_CELL_CHARACTERS = 32767;
export declare const MAX_XLSX_RICH_TEXT_RUNS_PER_CELL = 512;
export declare const MAX_XLSX_RICH_TEXT_CELLS = 10000;
export declare const MAX_XLSX_RICH_TEXT_RUNS = 100000;
export declare const MAX_XLSX_RICH_TEXT_FONT_NAME_CHARACTERS = 128;
export declare const MAX_XLSX_RICH_TEXT_FONT_SIZE = 409;
export interface XlsxRichTextRun {
    a3sXlsxColorOrigin?: XlsxSemanticColorOrigin;
    bl?: 0 | 1;
    cl?: 0 | 1;
    fc?: string;
    ff?: string;
    fs?: number;
    it?: 0 | 1;
    un?: SpreadsheetUnderlineCellValue;
    v: string;
}
export interface NormalizedXlsxRichTextCell {
    runs: XlsxRichTextRun[];
    text: string;
}
/**
 * Normalizes the text state that may participate in caret-level rich-text
 * authoring. Native runs remain authoritative; bounded plain strings receive
 * one run derived from the cell-wide font so partial formatting and formatted
 * paste share the same conversion contract.
 */
export declare function normalizeXlsxRichTextEditSource(cell: Cell | null | undefined): NormalizedXlsxRichTextCell | null;
export declare function xlsxRichTextBaseRun(cell: Cell | null | undefined, text: string): XlsxRichTextRun;
export declare function normalizeXlsxRichTextCell(cell: Cell): NormalizedXlsxRichTextCell | null;
export declare function normalizeXlsxRichTextRun(value: unknown): XlsxRichTextRun | null;
export declare function normalizeXlsxRichTextColor(value: unknown): string | null;
export declare function coalesceXlsxRichTextRuns(source: readonly XlsxRichTextRun[]): XlsxRichTextRun[];
export declare function sameXlsxRichTextRunStyle(left: XlsxRichTextRun, right: XlsxRichTextRun): boolean;
export declare function validXlsxRichText(value: string): boolean;
export declare function isHighSurrogate(value: number): boolean;
export declare function isLowSurrogate(value: number): boolean;