export default class BlackList {
    filename: string;
    blackList: string[];
    constructor(filename: string);
    /**
     * Read blacklist from the file
     * @private
     */
    private readBlacklist;
    /**
     * Write current blacklist array into the file
     * @private
     */
    private writeBlacklist;
    /**
     * Add a token to the blacklist
     * @param token
     */
    add(token: string): boolean;
    /**
     * Check if a token is blacklisted or not
     * @param token
     */
    has(token: string): boolean;
    /**
     * Remove a token from the blacklist
     * @param token
     */
    remove(token: string): boolean;
}