/**
 * Formats content for copying to clipboard.
 * Joins array items with double newline, or returns string as-is.
 *
 * @param content - Content to format (string or array of strings)
 * @returns Formatted text ready for clipboard
 */
export declare function formatCopyText(content: string | string[]): string;
/**
 * Copy content to clipboard using execCommand.
 * Reliable method that works in all environments including iframes, HTTP, and older browsers.
 * Accepts both string and array of strings (arrays are joined with double newline).
 *
 * @param content - Content to copy (string or array of strings)
 * @returns true if copy was successful, false otherwise
 */
export declare function copyToClipboard(content: string | string[]): boolean;