export declare const MAX_SPARK_ATTACHMENT_FILE_SIZE_BYTES: number;
export declare const MAX_SPARK_ATTACHMENT_TOTAL_SIZE_BYTES: number;
export declare const MAX_SPARK_ATTACHMENTS_PER_REPLY = 10;
export declare function resolveClientAttachmentContentType(file: File): string;
export declare function normalizeAttachmentForModel(file: File): Promise<File>;