/**
 * Arabic-script numerals, written and read: the Arabic-Indic digits of the
 * Mashriq (٠١٢٣٤٥٦٧٨٩, U+0660–0669) and the Extended Arabic-Indic digits
 * of Persian and Urdu (۰۱۲۳۴۵۶۷۸۹, U+06F0–06F9); the additive abjad
 * numerals of Classical Arabic and manuscript foliation (يا = 11,
 * غتمو = 1446) in the Mashriqi and the Maghrebi values; and the letter
 * series that number list items and front matter, in abjad order
 * (أ ب ج د هـ) and in the alphabetical, hijāʾī order (أ ب ت ث). Also
 * the reverse for digits: an Arabic author types ٣ where a Latin one
 * types 3.
 */
import type { DigitSystem } from './types.js';
/** `n` in Arabic-Indic digits: 2026 → ٢٠٢٦. */
export declare function arabicIndicDecimal(n: number): string;
/** `n` in Extended Arabic-Indic (Persian) digits: 2026 → ۲۰۲۶. Urdu writes
 *  the same code points; its glyph forms come from the font (`locl`). */
export declare function persianDecimal(n: number): string;
/**
 * The ASCII digits of an engine-generated string in the document's digit
 * system: `'arab'` writes ٠–٩, `'arabext'` ۰–۹, `'latn'` (or none) leaves
 * the string as it is. Only strings the engine composed go through it — a
 * page count, a chapter ordinal, the fallback of a list number — never
 * the author's text.
 */
export declare function withDigits(text: string, digits: DigitSystem | undefined): string;
/** Arabic-Indic (٠–٩) and Extended Arabic-Indic (۰–۹) digits turned into
 *  ASCII ones, everything else kept: what a number an author typed on an
 *  Arabic or Persian keyboard (`startAt=٣`, `:::part{number="١٢"}`) is
 *  read through before `Number()`. */
export declare function asciiDigits(text: string): string;
/**
 * `n` in additive abjad numerals, highest value first in logical order
 * (the reader sees it right to left): 11 يا, 15 يه, 1446 غتمو, 1835 غضله.
 * The thousands count is written before the thousand letter (2000 بغ, as
 * against 1002 غب). `'maghrebi'` takes the Maghrebi values. A final heh
 * that would stand alone takes a tatweel (5 هـ). Zero has no abjad numeral
 * and prints nothing; past 999 999 the number prints in digits.
 */
export declare function abjadNumeral(n: number, variant?: 'mashriqi' | 'maghrebi'): string;
/** The 28 letters in abjad order, as list items are lettered in Arabic
 *  textbooks and outlines (أ، ب، ج، د، هـ…). The first is written with its
 *  hamza, as a list marker always is: a bare alif reads as the digit ١. */
export declare const ABJAD_LETTERS: readonly string[];
/** The 28 letters in alphabetical (hijāʾī) order, the dictionary order of
 *  today (أ، ب، ت، ث، ج…); the first with its hamza, as above. */
export declare const HIJAI_LETTERS: readonly string[];
/**
 * The `n`th marker of a letter series, by the bijective rule of
 * `lower-alpha` (z, aa, ab…): past the last letter the series goes on in
 * two letters (أأ, أب…), then three. A final heh that would stand alone
 * takes a tatweel (هـ). Zero and below print nothing.
 */
export declare function arabicLettering(n: number, letters: readonly string[]): string;
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