import ImmutablePrioritySet from "../util/ImmutablePrioritySet";
import Predicate from "../util/Predicate";
import Accidental from "./Accidental";
import Key from "./Key";
import KeySignature from "./KeySignature";
import Letter from "./Letter";
interface Policy extends Predicate<Key> {
}
declare module Policy {
    function prioritize(...policies: Policy[]): ImmutablePrioritySet<Policy>;
    function matchLetter(letter: Letter): Policy;
    function matchAccidental(accidental: Accidental): Policy;
    function matchKeySignature(keySignature: KeySignature): Policy;
    const NONE: Policy;
    const NATURAL: Policy;
    const NONE_OR_NATURAL: (k: any) => boolean;
    const SHARP: Policy;
    const DOUBLE_SHARP: Policy;
    const TRIPLE_SHARP: Policy;
    const SHARPS: (k: any) => boolean;
    const FLAT: Policy;
    const DOUBLE_FLAT: Policy;
    const TRIPLE_FLAT: Policy;
    const FLATS: (k: any) => boolean;
    const DEFAULT_PRIORITY: ImmutablePrioritySet<Policy>;
}
export default Policy;