import type { Header } from '@rspress/core';
export declare function backTrackHeaders(rawHeaders: Header[], index: number): Header[];
export declare function formatText(text: string): string;
export declare function normalizeTextCase(text: string | number): string;
export declare function removeDomain(url: string): string;
export declare function substrByBytes(str: string, start: number, len: number): string;
export declare function byteToCharIndex(str: string, byteIndex: number): number;
/**
 *
 * @param str raw text content
 * @param start start index (char index)
 * @param length byte length for sliced string
 * @returns sliced string
 */
export declare function getSlicedStrByByteLength(str: string, start: number, length: number): string;
export declare function getStrByteLength(str: string): number;