/**
 * Greek gematria (isopsephy) calculations.
 *
 * SOURCES (Chicago format, all public domain):
 *
 * Gow, James. "The Greek Numerical Alphabet." The Journal of Philology 12 (1883): 278-284.
 *    https://archive.org/details/journalphilolog12teleduof
 *
 * Heath, Thomas L. Diophantus of Alexandria: A Study in the History of Greek Algebra.
 *    Cambridge: Cambridge University Press, 1910.
 *    https://archive.org/details/diophaborr00teleduof
 *
 * Heath, Thomas L. A History of Greek Mathematics. 2 vols. Oxford: Clarendon Press, 1921.
 *    https://archive.org/details/historyofgreekma01teleduof
 *
 * Hippolytus. Refutation of All Heresies. Translated by J. H. MacMahon. Edinburgh, 1868.
 *    Book IV, Chapter 14: Pythagoras to Telauges (πυθμήν / digital root method).
 *    https://archive.org/details/antenicenefathertel05robe
 *
 * VERIFIED EXAMPLES:
 *    - λογος (logos): λ=30 + ο=70 + γ=3 + ο=70 + ς=200 = 373 ✓
 *    - θεος (theos): θ=9 + ε=5 + ο=70 + ς=200 = 284 ✓
 *    - ιησους (Iesous): ι=10 + η=8 + σ=200 + ο=70 + υ=400 + ς=200 = 888 ✓
 *
 * See: sources/isopsephy/SYSTEMS_BY_SOURCE.md for complete documentation
 */
import type { GematriaValues } from '../models/types.js';
/**
 * Check if text contains Greek characters.
 */
export declare function isGreek(text: string): boolean;
/**
 * Remove diacritical marks from Greek text.
 * Iota subscripts are first converted to adscripts so they count for gematria.
 */
export declare function removeDiacritics(text: string): string;
/**
 * Extract only Greek letters from text.
 */
export declare function extractGreekLetters(text: string): string;
/**
 * Compute standard Greek isopsephy value.
 */
export declare function computeStandard(text: string): number;
/**
 * Compute ordinal Greek value.
 *
 * Uses the standard 24-letter Greek alphabet (alpha to omega).
 * Archaic letters (stigma Ϛ/ϛ, koppa Ϟ/ϟ, sampi Ϡ/ϡ) have standard isopsephy
 * values but no ordinal position in the alphabet.
 *
 * @param text - The Greek text to calculate
 * @param strict - If true (default), throws an error when archaic letters are encountered.
 *                 If false, silently skips archaic letters (treats them as 0).
 * @throws {Error} When archaic letters are detected and strict mode is enabled
 */
export declare function computeOrdinal(text: string, strict?: boolean): number;
/**
 * Compute reduced Greek value (digital root of standard).
 */
export declare function computeReduced(text: string): number;
/**
 * Compute all Greek gematria values for the given text.
 */
export declare function computeGreek(text: string): GematriaValues;
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