Alchemy.Events.on_emoji_update

You're seeing just the macro on_emoji_update, go back to Alchemy.Events module for more information.
Link to this macro

on_emoji_update(func)

(macro)

Registers a handle triggering whenever a guild's emojis get updated.

args : [Guild.emoji], snowflake

Receives a list of the current emojis in the guild, after this event, and the id of the guild itself.