import { Scale } from '../scale';
import { RomanNumeral } from './roman-numeral';
import { MatchingRule } from './rule';
export type SubstitutionRule = {
    target: MatchingRule;
    substitute: MatchingRule;
};
/**
 * Substitutions represent replacements of chords with another
 * I.e. V can be replaced with V7, I can be replaced with vi6
 *
 * These substitutions happen after expansions are applied, can only be applied to progression chords, and don't change the progression
 */
export declare namespace Substitution {
    const basic: SubstitutionRule[];
    const dominantInversions: SubstitutionRule[];
    const subdominantSevenths: SubstitutionRule[];
    const defaultSubstitutions: SubstitutionRule[];
    function matchingSubstitutions(scale: Scale, target: RomanNumeral, substitutions?: SubstitutionRule[]): Generator<RomanNumeral>;
}