interface ParseOptions {
    appendStrOnEnd?: string;
    hasExplicitUndefined?: boolean;
}
/**
 * A robust JSON parser designed to handle and recover data from JSON strings
 * with extraneous text and incomplete structures. Ideal for parsing JSON strings that include
 * redundant pre/post content or are missing closing characters like \", ], and }.
 */
export declare class FuzzyJsonParser {
    private index;
    private str;
    private hasExplicitUndefined;
    private appendStrOnEnd;
    private currParseSettings;
    constructor({ appendStrOnEnd, hasExplicitUndefined }?: ParseOptions);
    /**
    * Parses a JSON string while handling extraneous and incomplete structures.
    * @param {string} jsonStr - The JSON string to parse.
    * @param {string[]} requiredKeys - An optional array of keys that must be present in the JSON string.
    * @param {ParseOptions} [options] - Optional settings to override the default parser options.
    * @returns {any} The parsed JSON object or `null` if parsing fails.
    */
    parse(jsonStr: string, requiredKeys?: string[], options?: ParseOptions): any;
    private extractJsonLikeSegments;
    private findAndParseValidJsonSegment;
    private containsRequiredKeys;
    private parseBase;
    private resetParser;
    private parseInternal;
    private parseValue;
    private parseObject;
    private parseArray;
    private parseString;
    private parseNumber;
    private parseBoolean;
    private parseNull;
    private parseUndefined;
    private skipWhitespace;
    private isDigit;
}
export { type ParseOptions };