import type { Adapter } from "../index.js";
import { FilesError } from "../internal/errors.js";
export interface FsAdapterOptions {
    /**
     * Absolute or relative directory the adapter manages. Created on first
     * upload if it doesn't exist. All operations are scoped to this root —
     * keys that resolve outside it (e.g. `../etc/passwd`) throw `Provider`.
     */
    root: string;
    /**
     * Optional URL prefix for `url()`. When set, `url(key)` returns
     * `${urlBaseUrl}/${key}` — useful when a dev server (Next.js `/public`
     * mount, `serve-static`, etc.) is exposing the same root. When unset,
     * `url()` returns a `file://` URL — appropriate for CLIs/tests, not
     * for browsers.
     */
    urlBaseUrl?: string;
    /**
     * Accepted for backward compatibility but ignored. `url()` returns a
     * `file://` or static-server URL, and `signedUploadUrl()` fails closed
     * because the fs adapter has no built-in upload signer or verifier.
     */
    defaultUrlExpiresIn?: number;
}
export type FsAdapter = Adapter<{
    root: string;
}> & {
    readonly root: string;
};
export declare const mapFsError: (err: unknown) => FilesError;
export declare const fs: (opts: FsAdapterOptions) => FsAdapter;
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