export interface GatewayMessageEventExtraFieldsSee also: https://discord.com/developers/docs/topics/gateway-events#message-create-message-create-extra-fields
optionalexternalguild_id? : Snowflake
ID of the guild the message was sent in
optionalexternalmember? : APIGuildMemberNoUser
Member properties for this message's authorThe member object exists in MESSAGE_CREATE and MESSAGE_UPDATE events from text-based guild channels
See also: https://discord.com/developers/docs/resources/guild#guild-member-object
externalmentions : APIUserWithMember[]
Users specifically mentioned in the message
See also: https://discord.com/developers/docs/resources/user#user-object