def METHOD_NAME() -> None:
    # Prepare gemoji names map.
    reverse_unified_reactions_map: Dict[str, List[str]] = {}
    for name in UNIFIED_REACTIONS_MAP:
        emoji_code = UNIFIED_REACTIONS_MAP[name]
        if emoji_code in reverse_unified_reactions_map:
            reverse_unified_reactions_map[emoji_code].append(name)
        else:
            reverse_unified_reactions_map[emoji_code] = [name]
    for emoji_code in reverse_unified_reactions_map:
        emoji_code_to_gemoji_names[emoji_code] = ", ".join(
            reverse_unified_reactions_map[emoji_code]
        )
    # Prepare iamcal names map.
    for emoji_dict in EMOJI_DATA:
        emoji_code = get_emoji_code(emoji_dict)
        emoji_code_to_iamcal_names[emoji_code] = ", ".join(emoji_dict["short_names"])
    # Prepare zulip names map.
    for emoji_code in EMOJI_NAME_MAPS:
        canonical_name = EMOJI_NAME_MAPS[emoji_code]["canonical_name"]
        aliases = EMOJI_NAME_MAPS[emoji_code]["aliases"]
        names = [canonical_name]
        names.extend(aliases)
        emoji_code_to_zulip_names[emoji_code] = ", ".join(names)