/**
 * Shared attachment validation and processing utilities for chat services.
 *
 * Validates attachment size/count limits and converts IChatAttachmentInput[]
 * into IChatAttachmentMetadata[] for storage on messages.
 *
 * Requirements: 11.1, 11.2, 11.4, 11.5
 */
import { IAttachmentConfig, IChatAttachmentInput, IChatAttachmentMetadata } from '../../interfaces/communication';
/**
 * Validate attachment limits and produce metadata entries.
 *
 * Checks count limit first, then per-file size limit.
 * Returns an array of IChatAttachmentMetadata with generated assetIds.
 *
 * @throws TooManyAttachmentsError if attachments.length > config.maxAttachmentsPerMessage
 * @throws AttachmentTooLargeError if any attachment exceeds config.maxFileSizeBytes
 */
export declare function validateAndPrepareAttachments(attachments: IChatAttachmentInput[], config?: IAttachmentConfig): IChatAttachmentMetadata[];
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