feat(builders): add attachment command option type (#7203)

packages/builders/src/interactions/slashCommands/mixins/SharedSlashCommandOptions.ts

@@ -6,6 +6,7 @@ import { SlashCommandIntegerOption } from '../options/integer';
 import { SlashCommandMentionableOption } from '../options/mentionable';
 import { SlashCommandNumberOption } from '../options/number';
 import { SlashCommandRoleOption } from '../options/role';
+import { SlashCommandAttachmentOption } from '../options/attachment';
 import { SlashCommandStringOption } from '../options/string';
 import { SlashCommandUserOption } from '../options/user';
 import type { ToAPIApplicationCommandOptions } from '../SlashCommandBuilder';
@@ -53,6 +54,17 @@ export class SharedSlashCommandOptions<ShouldOmitSubcommandFunctions = true> {
 		return this._sharedAddOptionMethod(input, SlashCommandRoleOption);
 	}
 
+	/**
+	 * Adds an attachment option
+	 *
+	 * @param input A function that returns an option builder, or an already built builder
+	 */
+	public addAttachmentOption(
+		input: SlashCommandAttachmentOption | ((builder: SlashCommandAttachmentOption) => SlashCommandAttachmentOption),
+	) {
+		return this._sharedAddOptionMethod(input, SlashCommandAttachmentOption);
+	}
+
 	/**
 	 * Adds a mentionable option
 	 *

packages/builders/src/interactions/slashCommands/options/attachment.ts

@@ -0,0 +1,12 @@
+import { APIApplicationCommandAttachmentOption, ApplicationCommandOptionType } from 'discord-api-types/v9';
+import { ApplicationCommandOptionBase } from '../mixins/ApplicationCommandOptionBase';
+
+export class SlashCommandAttachmentOption extends ApplicationCommandOptionBase {
+	public override readonly type = ApplicationCommandOptionType.Attachment as const;
+
+	public toJSON(): APIApplicationCommandAttachmentOption {
+		this.runRequiredValidations();
+
+		return { ...this };
+	}
+}