import * as Range from './char-code-range.js';
import * as Stream from './stream.js';
type WithHash<T> = T & {
    hash: number;
};
type CharSetWithoutHash = {
    type: 'empty';
} | {
    type: 'node';
    range: Range.CharCodeRange;
    left: CharSet;
    right: CharSet;
};
export type CharSet = Readonly<WithHash<CharSetWithoutHash>>;
export declare const empty: CharSet;
export declare function checkInvariants(set: CharSet): void;
export declare function singleton(char: string): CharSet;
export declare function fromArray(chars: string[]): CharSet;
export declare function isEmpty(set: CharSet): boolean;
export declare function fromRange(range: Range.CharCodeRange): CharSet;
export declare function charRange(startChar: string, endChar: string): CharSet;
export declare function isSingleton(set: CharSet): boolean;
export declare function includes(set: CharSet, charCode: number): boolean;
export declare function insertRange(set: CharSet, range: Range.CharCodeRange): CharSet;
export declare function deleteRange(set: CharSet, range: Range.CharCodeRange): CharSet;
export declare function intersectRange(set: CharSet, range: Range.CharCodeRange): Range.CharCodeRange[];
export declare function getRanges(set: CharSet): Generator<Range.CharCodeRange>;
export declare function union(setA: CharSet, setB: CharSet): CharSet;
export declare function difference(setA: CharSet, setB: CharSet): CharSet;
export declare function intersection(setA: CharSet, setB: CharSet): CharSet;
export declare function complement(set: CharSet): CharSet;
export declare function compare(setA: CharSet, setB: CharSet): number;
export declare function toString(set: CharSet): string;
export declare function enumerate(set: CharSet): Stream.Stream<string>;
export declare function size(set: CharSet): number;
export declare function sampleChar(set: CharSet, randomInt: (max: number) => number): string | null;
export declare const alphabet: CharSet;
export declare const wildcard: (options?: {
    dotAll: boolean;
}) => CharSet;
export declare const digitChars: CharSet;
export declare const nonDigitChars: CharSet;
export declare const wordChars: CharSet;
export declare const nonWordChars: CharSet;
export declare const whiteSpaceChars: CharSet;
export declare const nonWhiteSpaceChars: CharSet;
export declare const printableAsciiChars: CharSet;
export {};