Nostrum.Api.delete_reaction

You're seeing just the function delete_reaction, go back to Nostrum.Api module for more information.
Link to this function

delete_reaction(channel_id, message_id, emoji)

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Specs

delete_reaction(
  Nostrum.Struct.Channel.id(),
  Nostrum.Struct.Message.id(),
  emoji()
) :: error() | {:ok}

Deletes all reactions of a given emoji from a message.

This endpoint requires the MANAGE_MESSAGES permissions. It fires a Nostrum.Consumer.message_reaction_remove_emoji/0 event.

If successful, returns {:ok}. Otherwise, returns Nostrum.Api.error/0.

See create_reaction/3 for similar examples.