export type AttachmentDeliveryMode = 'inline_native' | 'reference_only';
export type AttachmentArchiveType = 'gz' | 'tgz' | 'zip';
type AttachmentTypeInput = {
    fileName?: string;
    mimeType?: string | null;
};
export declare function detectAttachmentArchiveType(input: AttachmentTypeInput): AttachmentArchiveType | null;
export declare function classifyAttachmentDelivery(input: AttachmentTypeInput): AttachmentDeliveryMode;
export declare function isSupportedAttachmentUploadType(input: AttachmentTypeInput): boolean;
export {};
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