import { UniFlattenOptions } from './type';
export declare const CLASS_MAPPING_SYMBOL: unique symbol;
export declare const SPECIAL_CHARACTER_REGEX: RegExp;
export declare const config: {
    strict: false;
    circularReference: "string";
    flattenClassInstances: false;
    unflattenToClassInstances: false;
    serializeFlattenKey: (key: string, prefix: string, meta: {
        isArrayIndex: boolean;
        hasSpecialCharacters: boolean;
        canUseDotNotation: boolean;
    }) => string;
};
export declare const mergeConfig: (options?: UniFlattenOptions) => {
    circularReference: "string" | "symbol" | "null";
    strict: boolean;
    unflattenToClassInstances: boolean;
    flattenClassInstances: boolean;
    serializeFlattenKey: (key: string, prefix: string, meta: {
        isArrayIndex: boolean;
        hasSpecialCharacters: boolean;
        canUseDotNotation: boolean;
    }) => string;
};
export declare const parsePath: (str: string, strict?: boolean) => (string | number)[];
export declare function formatCircularKey(id: string, option?: UniFlattenOptions['circularReference']): string | symbol | null;
export declare function extractCircularKey(value: unknown, option?: UniFlattenOptions['circularReference']): string | undefined;
export declare function extractCircularValue(value: unknown, circularKey: string): any;
export declare function isObject(obj: unknown): obj is object;
export declare function isPlainObject(obj: unknown): boolean;
export declare function isClassInstance(obj: unknown): boolean;