export declare const MAX_FILE_BYTES: number;
export declare const MEMORY_WARN_BYTES: number;
export interface CheckedFile {
    path: string;
    name: string;
    size: number;
}
export declare class SafetyError extends Error {
    constructor(message: string);
}
export declare function assertWithinRoot(root: string, candidate: string): string;
export declare function isSensitivePath(p: string): boolean;
export declare function blockedExtension(p: string): string | null;
/**
 * Validates explicit paths (files or directories) and expands directories.
 * Explicitly-passed sensitive/blocked files are hard errors; sensitive files
 * discovered inside an expanded directory are skipped and reported instead.
 */
export declare function collectFiles(root: string, inputPaths: string[]): Promise<{
    files: CheckedFile[];
    skipped: string[];
}>;
/** Prevents path traversal from hostile filenames when saving received files. */
export declare function safeSaveName(fileName: string): string;