export declare const initializeCharacter: (options: {
    whitespace?: string[];
}) => {
    isDigit: (ch: string) => boolean;
    isAlphabetic: (ch: string) => boolean;
    isAlphabeticUppercase: (ch: string) => boolean;
    isAlphabeticLowercase: (ch: string) => boolean;
    isControl: (ch: string) => boolean;
    isSymbolic: (ch: string) => boolean;
    isWhitespace: (ch: string) => boolean;
};