import type { PropFormula } from "../../../models";
/**
 * Applies the implication introduction rule.
 *
 * Given two formulas premise and conclusion, it returns their implication
 *
 * @param formulas An array of propositional formulas.
 * @returns {[PropFormula]} A tuple containing the inferred formula.
 * @throws {Error} if the formulas do not satisfy disjunction introduction conditions.
 */
export declare function implicationIntroduction(formulas: PropFormula[]): [PropFormula];