/** PDF + Office extensions (aligned with platform shared/utils/contentType.ts). */
export declare const ACCEPTED_FILE_EXTENSIONS: readonly ["pdf", "doc", "docx", "xls", "xlsx", "ppt", "pptx"];
export declare const ACCEPTED_FILE_TYPES: string;
/** Returns true when the file is an allowed PDF/Office attachment. */
export declare function isAcceptedAttachmentFile(file: File): boolean;