import type { Upload, DocumentQuery, DbOperation } from './types.ts';
/**
 * Input for file upload - can be either a File from FormData or a Buffer with filename
 */
type UploadInput = File | {
    data: Buffer;
    filename: string;
};
/**
 * Adds an upload to a document, handling both database and file system operations.
 *
 * This function:
 * 1. Generates a unique storage filename with timestamp and random bytes
 * 2. If filename collides with existing upload, marks that upload as hidden and renames it
 * 3. Creates the upload record in the database (with transaction)
 * 4. Writes the file to disk
 *
 * @param client Database client
 * @param query Document query (supports path string, id number, OptimisticDocument, Route, etc.)
 * @param uploadsPath Path to the uploads directory
 * @param input Either a File object from FormData or {data: Buffer, filename: string}
 * @returns The Upload object with additional filePath property
 * @throws Error if document doesn't exist or if there's a constraint violation
 */
export declare const addUpload: DbOperation<[DocumentQuery, string, UploadInput], Upload & {
    filePath: string;
}>;
export {};
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