interface Key {
    readonly type: "major" | "minor";
    readonly tonic: string;
    readonly alteration: number;
    readonly keySignature: string;
}
interface KeyScale {
    readonly tonic: string;
    readonly grades: readonly string[];
    readonly intervals: readonly string[];
    readonly scale: readonly string[];
    readonly triads: readonly string[];
    readonly chords: readonly string[];
    readonly chordsHarmonicFunction: readonly string[];
    readonly chordScales: readonly string[];
    readonly secondaryDominants: readonly string[];
    readonly secondaryDominantSupertonics: readonly string[];
    readonly substituteDominants: readonly string[];
    readonly substituteDominantSupertonics: readonly string[];
    readonly secondaryDominantsMinorRelative: readonly string[];
    readonly substituteDominantsMinorRelative: readonly string[];
}
interface MajorKey extends Key, KeyScale {
    readonly type: "major";
    readonly minorRelative: string;
    readonly scale: readonly string[];
    readonly substituteDominants: readonly string[];
    readonly secondaryDominantSupertonics: readonly string[];
    readonly substituteDominantsMinorRelative: readonly string[];
}
interface MinorKey extends Key {
    readonly type: "minor";
    readonly relativeMajor: string;
    readonly natural: KeyScale;
    readonly harmonic: KeyScale;
    readonly melodic: KeyScale;
}
type KeyChord = {
    name: string;
    roles: string[];
};
/**
 * Get a major key properties in a given tonic
 * @param tonic
 */
declare function majorKey(tonic: string): MajorKey;
/**
 * Get a list of available chords for a given major key
 * @param tonic
 * @returns array of { name: string, roles: string[] }
 */
declare function majorKeyChords(tonic: string): KeyChord[];
/**
 * Get a list of available chords for a given major key
 * @param tonic
 * @returns array of { name: string, roles: string[] }
 */
declare function minorKeyChords(tonic: string): KeyChord[];
/**
 * Get minor key properties in a given tonic
 * @param tonic
 */
declare function minorKey(tnc: string): MinorKey;
/**
 * Given a key signature, returns the tonic of the major key
 * @param signature
 * @example
 * majorTonicFromKeySignature('###') // => 'A'
 */
declare function majorTonicFromKeySignature(sig: string | number): string | null;
/** @deprecated */
declare const _default: {
    majorKey: typeof majorKey;
    majorTonicFromKeySignature: typeof majorTonicFromKeySignature;
    minorKey: typeof minorKey;
};

export { type Key, type KeyChord, type KeyScale, type MajorKey, type MinorKey, _default as default, majorKey, majorKeyChords, majorTonicFromKeySignature, minorKey, minorKeyChords };