discordeno/helpers/messages/removeReaction.ts

import type { Bot } from "../../bot.ts";

/** Removes a reaction from the given user on this message, defaults to bot. Reaction takes the form of **name:id** for custom guild emoji, or Unicode characters. */
export async function removeReaction(
  bot: Bot,
  channelId: bigint,
  messageId: bigint,
  reaction: string,
  options?: { userId?: bigint },
) {
  if (reaction.startsWith("<:")) {
    reaction = reaction.substring(2, reaction.length - 1);
  } else if (reaction.startsWith("<a:")) {
    reaction = reaction.substring(3, reaction.length - 1);
  }

  await bot.rest.runMethod<undefined>(
    bot.rest,
    "delete",
    options?.userId
      ? bot.constants.endpoints.CHANNEL_MESSAGE_REACTION_USER(
        channelId,
        messageId,
        encodeURIComponent(reaction),
        options.userId,
      )
      : bot.constants.endpoints.CHANNEL_MESSAGE_REACTION_ME(channelId, messageId, encodeURIComponent(reaction)),
  );
}