types(DirectoryChannel): Ensure directory channels cannot contain user mentions when stringified (#10043)

* types(DirectoryChannel): `ChannelMention` `toString()`

* refactor: dynamic test

Author: Jiralite

packages/discord.js/typings/index.d.ts

@@ -2888,6 +2888,7 @@ export class DirectoryChannel extends BaseChannel {
   public guild: InviteGuild;
   public guildId: Snowflake;
   public name: string;
+  public toString(): ChannelMention;
 }
 
 export class StageInstance extends Base {

packages/discord.js/typings/index.test-d.ts

@@ -186,6 +186,8 @@ import {
   Emoji,
   PartialEmoji,
   Awaitable,
+  Channel,
+  DirectoryChannel,
 } from '.';
 import { expectAssignable, expectNotAssignable, expectNotType, expectType } from 'tsd';
 import type { ContextMenuCommandBuilder, SlashCommandBuilder } from '@discordjs/builders';
@@ -2282,16 +2284,12 @@ declare const anyComponentsActionRowComp: ActionRow<ActionRowComponent>;
 expectType<ActionRowBuilder>(ActionRowBuilder.from(anyComponentsActionRowData));
 expectType<ActionRowBuilder>(ActionRowBuilder.from(anyComponentsActionRowComp));
 
-declare const stageChannel: StageChannel;
-declare const partialGroupDMChannel: PartialGroupDMChannel;
+type UserMentionChannels = DMChannel | PartialDMChannel;
+declare const channelMentionChannels: Exclude<Channel | DirectoryChannel, UserMentionChannels>;
+declare const userMentionChannels: UserMentionChannels;
 
-expectType<ChannelMention>(textChannel.toString());
-expectType<ChannelMention>(voiceChannel.toString());
-expectType<ChannelMention>(newsChannel.toString());
-expectType<ChannelMention>(threadChannel.toString());
-expectType<ChannelMention>(stageChannel.toString());
-expectType<ChannelMention>(partialGroupDMChannel.toString());
-expectType<UserMention>(dmChannel.toString());
+expectType<ChannelMention>(channelMentionChannels.toString());
+expectType<UserMention>(userMentionChannels.toString());
 expectType<UserMention>(user.toString());
 expectType<UserMention>(guildMember.toString());
 
@@ -2313,7 +2311,9 @@ expectType<Promise<Message>>(interactionWebhook.send('content'));
 expectType<Promise<Message>>(interactionWebhook.editMessage(snowflake, 'content'));
 expectType<Promise<Message>>(interactionWebhook.fetchMessage(snowflake));
 
+declare const partialGroupDMChannel: PartialGroupDMChannel;
 declare const categoryChannel: CategoryChannel;
+declare const stageChannel: StageChannel;
 declare const forumChannel: ForumChannel;
 
 await forumChannel.edit({