/**
 * Suffix of the staging file an in-progress resumable upload appends to before
 * it is renamed over the target key (the fs adapter reserves the same one).
 * `list()` hides staging files, and writes refuse keys that would land on one,
 * so a paused or crashed upload never surfaces as a truncated object.
 */
export declare const RESUMABLE_STAGING_SUFFIX = ".fls-part";
/**
 * Whether a remote name or path is a resumable-upload staging file. Folded to
 * lower case because FTP/SFTP servers on Windows hosts match names
 * case-insensitively.
 */
export declare const isStagingPath: (path: string) => boolean;
/**
 * Throw `Invalid` when a write would land on a resumable-upload staging path.
 * Reads and deletes of such a path stay allowed, so a stray staging file can
 * still be inspected or cleaned up.
 */
export declare const assertNotStagingPath: (adapter: string, remote: string, key: string) => void;
/**
 * Strip leading and trailing slashes. `"/uploads/"`, `"uploads/"`, and
 * `"uploads"` all collapse to `"uploads"`; `"/"` collapses to `""`.
 */
export declare const trimSlashes: (s: string) => string;
/**
 * Join a configured remote `root` with a virtual `key`, returning the path the
 * adapter hands to its client. The traversal guard runs on `key` here, so
 * every method that maps a key to a path gets the check for free.
 *
 * `root` shape is preserved: an absolute root (`/uploads`) yields an absolute
 * path, an empty/`"."` root yields a path relative to the connection's login
 * directory (the common SFTP chroot/home case), and a relative root prefixes
 * verbatim.
 */
export declare const joinRemotePath: (root: string, key: string) => string;
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