import type { MessageAttachment } from "./types";
export declare function hashString(str: string): string;
/**
 * Validates total size of attachments
 */
export declare function isValidTotalSize(attachments: MessageAttachment[]): boolean;
/**
 * Converts a File to a MessageAttachment
 */
export declare function fileToAttachment(file: File): Promise<MessageAttachment>;
/**
 * Formats file size for display
 */
export declare function formatFileSize(bytes: number): string;
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