import { CID, MultibaseDecoder } from 'multiformats/cid';
/**
 * Converts a value to a CID or returns null if it cannot be converted.
 */
export declare function toCidOrNull<T extends string>(value: CID | string | null | unknown, base?: MultibaseDecoder<T> | undefined): CID | null;
/**
 * This function is deprecated, use `getCodeOrNull` instead.
 *
 * `cid.codec` is deprecated, use integer "code" property instead
 *
 * @deprecated
 */
export declare function getCodecOrNull(value: CID | string | null): string | null;
export declare function getCodeOrNull(value: CID | string | null): number | null;
export declare function toCidStrOrNull(value: CID | string | null): string | null;