import Exceptional from "../util/Exceptional";
import ImmutablePrioritySet from "../util/ImmutablePrioritySet";
import Accidental from "./Accidental";
import KeySignature from "./KeySignature";
import Letter from "./Letter";
import Policy from "./Policy";
export default class Key {
    private letter;
    private accidental;
    constructor(letter: Letter, parameter?: Accidental | Exceptional<Accidental>);
    step(amount: number, policies?: ImmutablePrioritySet<Policy>): Exceptional<Key>;
    apply(keySignature: KeySignature): Key;
    removeAccidental(): Key;
    natural(): Key;
    sharp(): Key;
    doubleSharp(): Key;
    tripleSharp(): Key;
    flat(): Key;
    doubleFlat(): Key;
    tripleFlat(): Key;
    hasAccidental(): boolean;
    isNatural(): boolean;
    isSharp(): boolean;
    isDoubleSharp(): boolean;
    isTripleSharp(): boolean;
    isFlat(): boolean;
    isDoubleFlat(): boolean;
    isTripleFlat(): boolean;
    getEnharmonicEquivalent(parameter: Letter | ImmutablePrioritySet<Policy>): Exceptional<Key>;
    static isEnharmonic(a: Key, b: Key): boolean;
    static fromOffset(offset: number, policies?: ImmutablePrioritySet<Policy>): Exceptional<Key>;
    getOffset(): number;
    static fromString(keyString: string): Exceptional<Key>;
    toString(): string;
    equals(other: any): boolean;
    getLetter(): Letter;
    getAccidental(): Exceptional<Accidental>;
}