Alchemy.Events.on_member_chunk

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

on_member_chunk(func)

(macro)

Registers a handle triggering whenever a shard receives a member chunk.

This event gets sent after a shard has requested offline guild member info for a guild.

args : snowflake, [Alchemy.Guild.GuildMember] Receives the id of the guild the members are from, and a list of members loaded.