export type GraderFilesSnapshot = {
    /** Every file, named `<dirName>/<relative path>` for `recordCompletedRun`. */
    files: {
        name: string;
        content: string;
    }[];
    /** The stored directory's name under `graders/`: a hash of every path and content. */
    dirName: string;
};
export declare function snapshotGraderFiles(dir: string): GraderFilesSnapshot;
export type TreeEntry = {
    rel: string;
    content: string;
};
/** A file under the walked directory: its path relative to that directory
 *  with `/` separators, and its absolute path. */
export type TreeFile = {
    rel: string;
    full: string;
};
/** Files under `dir`, sorted by relative path, read as text. */
export declare function readTreeRefusingSymlinks(dir: string, what: string): TreeEntry[];
/** Files under `dir`, sorted by relative path with `/` separators. Symlinks
 *  are refused: a stored copy must not depend on what a link pointed at.
 *  `what` names the directory in the refusal ("graderFiles", "files"). */
export declare function walkTreeRefusingSymlinks(dir: string, what: string): TreeFile[];