export declare const ERROR_MAP: {
    EACCES: string;
    EALREADY: string;
    EBADF: string;
    EBUSY: string;
    EDEADLK: string;
    EDQUOT: string;
    EEXIST: string;
    EFBIG: string;
    EILSEQ: string;
    EINPROGRESS: string;
    EINTR: string;
    EINVAL: string;
    EIO: string;
    EISDIR: string;
    ELOOP: string;
    EMLINK: string;
    EMSGSIZE: string;
    ENAMETOOLONG: string;
    ENODEV: string;
    ENOENT: string;
    ENOLCK: string;
    ENOMEM: string;
    ENOSPC: string;
    ENOTDIR: string;
    ERR_FS_EISDIR: string;
    ENOTEMPTY: string;
    ENOTRECOVERABLE: string;
    ENOTSUP: string;
    ENOTTY: string;
    ENXIO: string;
    EOVERFLOW: string;
    EPERM: string;
    EPIPE: string;
    EROFS: string;
    ESPIPE: string;
    ETXTBSY: string;
    EXDEV: string;
};
/**
 * Custom error for File operations with JCO compatible payload.
 */
export declare class FSError extends Error {
    payload: any;
    /**
     * @param {string} tag        – machine‐readable error tag
     * @param {string} [message]  – human‐readable message
     * @param {any}    [val]      – optional extra data
     * @param {object} [opts]
     * @param {Error} [opts.cause]
     */
    constructor(tag: any, message?: any, val?: any, opts?: {
        cause?: unknown;
    });
    /**
     * Create or rewrap an error into FSError
     * @param {any} err – number, string, Error, or FSError
     */
    static from(err: any): FSError;
}
export declare function filesystemErrorCode(err: any): any;