Setting emojis in a select menu

select.addOptions(
            new StringSelectMenuOptionBuilder()
                .setLabel(`${result.label}`)
                .setDescription('test')
                .setEmoji(/* What do I put here? */)
                .setDescription('x')
                .setValue(result.label)
            );

{
  code: "BUTTON_COMPONENT_INVALID_EMOJI",
  message: "Invalid emoji",
}