discordeno/src/helpers/channels/threads/start_thread.ts

import type { Channel } from "../../../types/channels/channel.ts";
import type { StartThread } from "../../../types/channels/threads/start_thread.ts";
import type { Bot } from "../../../bot.ts";
import { channelToThread } from "../../../util/transformers/channel_to_thread.ts";

/** Creates a new public thread from an existing message. Returns a thread channel. */
export async function startThread(bot: Bot, channelId: bigint, messageId: bigint, options: StartThread) {
  const channel = await bot.cache.channels.get(channelId);
  if (channel) {
    if (!channel.isGuildTextBasedChannel) {
      throw new Error(bot.constants.Errors.INVALID_THREAD_PARENT_CHANNEL_TYPE);
    }

    await bot.utils.requireBotChannelPermissions(bot, channel, ["SEND_MESSAGES", "USE_PUBLIC_THREADS"]);
  }

  return channelToThread(
    await bot.rest.runMethod<Channel>(
      bot.rest,
      "post",
      bot.constants.endpoints.THREAD_START_PUBLIC(channelId, messageId),
      {
        name: options.name,
        auto_archive_duration: options.autoArchiveDuration,
      }
    )
  );
}