/**
 * Replaces all unicode emoji characters in a string with their :shortcode: equivalents.
 * Handles multi-codepoint emoji (ZWJ sequences, variation selectors, skin tones).
 * Unknown emoji characters (not in emojis.ts) pass through unchanged.
 */
export declare function emojiToShortcode(text: string): string;
/**
 * Replaces all :shortcode: patterns in a string with their unicode emoji characters.
 * Unknown shortcodes pass through unchanged.
 */
export declare function shortcodeToEmoji(text: string): string;