export declare enum IntervalQuality {
    DIMINISHED = -2,
    MINOR = -1,
    PERFECT = 0,
    MAJOR = 1,
    AUGMENTED = 2
}
export declare namespace IntervalQuality {
    const names: string[];
    function toString(intervalQuality: IntervalQuality): string;
    function fromString(intervalQuality: string): number;
    function invert(intervalQuality: IntervalQuality): string;
}