feat(CommandInteraction): add support for localized slash commands

packages/discord.js/src/managers/ApplicationCommandManager.js

@@ -74,6 +74,8 @@ class ApplicationCommandManager extends CachedManager {
    * Options used to fetch Application Commands from Discord
    * @typedef {BaseFetchOptions} FetchApplicationCommandOptions
    * @property {Snowflake} [guildId] The guild's id to fetch commands for, for when the guild is not cached
+   * @property {LocaleString} [locale] The locale to use when fetching this command
+   * @property {boolean} [withLocalizations] Whether to fetch all localization data
    */
 
   /**
@@ -92,9 +94,9 @@ class ApplicationCommandManager extends CachedManager {
    *   .then(commands => console.log(`Fetched ${commands.size} commands`))
    *   .catch(console.error);
    */
-  async fetch(id, { guildId, cache = true, force = false } = {}) {
+  async fetch(id, { guildId, cache = true, force = false, locale, withLocalizations } = {}) {
     if (typeof id === 'object') {
-      ({ guildId, cache = true } = id);
+      ({ guildId, cache = true, locale, withLocalizations } = id);
     } else if (id) {
       if (!force) {
         const existing = this.cache.get(id);
@@ -104,7 +106,15 @@ class ApplicationCommandManager extends CachedManager {
       return this._add(command, cache);
     }
 
-    const data = await this.client.rest.get(this.commandPath({ guildId }));
+    const data = await this.client.rest.get(this.commandPath({ guildId }), {
+      headers: {
+        'X-Discord-Locale': locale,
+      },
+      query:
+        typeof withLocalizations === 'boolean'
+          ? new URLSearchParams({ with_localizations: withLocalizations })
+          : undefined,
+    });
     return data.reduce((coll, command) => coll.set(command.id, this._add(command, cache, guildId)), new Collection());
   }
 
@@ -216,7 +226,9 @@ class ApplicationCommandManager extends CachedManager {
   static transformCommand(command) {
     return {
       name: command.name,
+      name_localizations: command.nameLocalizations ?? command.name_localizations,
       description: command.description,
+      description_localizations: command.descriptionLocalizations ?? command.description_localizations,
       type: command.type,
       options: command.options?.map(o => ApplicationCommand.transformOption(o)),
       default_permission: command.defaultPermission ?? command.default_permission,

packages/discord.js/src/structures/ApplicationCommand.js

@@ -62,6 +62,26 @@ class ApplicationCommand extends Base {
       this.name = data.name;
     }
 
+    if ('name_localizations' in data) {
+      /**
+       * The name localizations for this command
+       * @type {?Object<string, string>}
+       */
+      this.nameLocalizations = data.name_localizations;
+    } else {
+      this.nameLocalizations ??= null;
+    }
+
+    if ('name_localized' in data) {
+      /**
+       * The localized name for this command
+       * @type {?Object<string, string>}
+       */
+      this.nameLocalized = data.name_localized;
+    } else {
+      this.nameLocalized ??= null;
+    }
+
     if ('description' in data) {
       /**
        * The description of this command
@@ -70,6 +90,26 @@ class ApplicationCommand extends Base {
       this.description = data.description;
     }
 
+    if ('description_localizations' in data) {
+      /**
+       * The description localizations for this command
+       * @type {?string}
+       */
+      this.descriptionLocalizations = data.description_localizations;
+    } else {
+      this.descriptionLocalizations ??= null;
+    }
+
+    if ('description_localized' in data) {
+      /**
+       * The localized description for this command
+       * @type {?string}
+       */
+      this.descriptionLocalized = data.description_localized;
+    } else {
+      this.descriptionLocalized ??= null;
+    }
+
     if ('options' in data) {
       /**
        * The options of this command
@@ -129,7 +169,10 @@ class ApplicationCommand extends Base {
    * @typedef {Object} ApplicationCommandData
    * @property {string} name The name of the command, must be in all lowercase if type is
    * {@link ApplicationCommandType.ChatInput}
+   * @property {Object<string, string>} [nameLocalizations] The localizations for the command name
    * @property {string} description The description of the command, if type is {@link ApplicationCommandType.ChatInput}
+   * @property {Object<string, string>} [descriptionLocalizations] The localizations for the command description,
+   * if type is {@link ApplicationCommandType.ChatInput}
    * @property {ApplicationCommandType} [type=ApplicationCommandType.ChatInput] The type of the command
    * @property {ApplicationCommandOptionData[]} [options] Options for the command
    * @property {boolean} [defaultPermission=true] Whether the command is enabled by default when the app is added to a
@@ -145,12 +188,14 @@ class ApplicationCommand extends Base {
    * @typedef {Object} ApplicationCommandOptionData
    * @property {ApplicationCommandOptionType} type The type of the option
    * @property {string} name The name of the option
+   * @property {Object<string, string>} [nameLocalizations] The name localizations for the option
    * @property {string} description The description of the option
+   * @property {Object<string, string>} [descriptionLocalizations] The description localizations for the option
    * @property {boolean} [autocomplete] Whether the autocomplete interaction is enabled for a
    * {@link ApplicationCommandOptionType.String}, {@link ApplicationCommandOptionType.Integer} or
    * {@link ApplicationCommandOptionType.Number} option
    * @property {boolean} [required] Whether the option is required
-   * @property {ApplicationCommandOptionChoice[]} [choices] The choices of the option for the user to pick from
+   * @property {ApplicationCommandOptionChoiceData[]} [choices] The choices of the option for the user to pick from
    * @property {ApplicationCommandOptionData[]} [options] Additional options if this option is a subcommand (group)
    * @property {ChannelType[]} [channelTypes] When the option type is channel,
    * the allowed types of channels that can be selected
@@ -160,6 +205,18 @@ class ApplicationCommand extends Base {
    * {@link ApplicationCommandOptionType.Number} option
    */
 
+  /**
+   * @typedef {Object} ApplicationCommandOptionChoiceData
+   * @property {string} name The name of the choice
+   * @property {Object<string, string>} [nameLocalizations] The localized names for this choice
+   * @property {string|number} value The value of the choice
+   */
+
+  /**
+   * @param {ApplicationCommandOptionChoiceData} ApplicationCommandOptionChoice
+   * @property {string} [nameLocalized] The localized name for this choice
+   */
+
   /**
    * Edits this application command.
    * @param {ApplicationCommandData} data The data to update the command with
@@ -185,6 +242,23 @@ class ApplicationCommand extends Base {
     return this.edit({ name });
   }
 
+  /**
+   * Edits the localized names of this ApplicationCommand
+   * @param {Object<string, string>} nameLocalizations The new localized names for the command
+   * @returns {Promise<ApplicationCommand>}
+   * @example
+   * // Edit the name localizations of this command
+   * command.setLocalizedNames({
+   *   'en-GB': 'test',
+   *   'pt-BR': 'teste',
+   * })
+   *   .then(console.log)
+   *   .catch(console.error)
+   */
+  setNameLocalizations(nameLocalizations) {
+    return this.edit({ nameLocalizations });
+  }
+
   /**
    * Edits the description of this ApplicationCommand
    * @param {string} description The new description of the command
@@ -194,6 +268,23 @@ class ApplicationCommand extends Base {
     return this.edit({ description });
   }
 
+  /**
+   * Edits the localized descriptions of this ApplicationCommand
+   * @param {Object<string, string>} descriptionLocalizations The new localized descriptions for the command
+   * @returns {Promise<ApplicationCommand>}
+   * @example
+   * // Edit the description localizations of this command
+   * command.setLocalizedDescriptions({
+   *   'en-GB': 'A test command',
+   *   'pt-BR': 'Um comando de teste',
+   * })
+   *   .then(console.log)
+   *   .catch(console.error)
+   */
+  setDescriptionLocalizations(descriptionLocalizations) {
+    return this.edit({ descriptionLocalizations });
+  }
+
   /**
    * Edits the default permission of this ApplicationCommand
    * @param {boolean} [defaultPermission=true] The default permission for this command
@@ -348,7 +439,11 @@ class ApplicationCommand extends Base {
    * @typedef {Object} ApplicationCommandOption
    * @property {ApplicationCommandOptionType} type The type of the option
    * @property {string} name The name of the option
+   * @property {Object<string, string>} [nameLocalizations] The localizations for the option name
+   * @property {string} [nameLocalized] The localized name for this option
    * @property {string} description The description of the option
+   * @property {Object<string, string>} [descriptionLocalizations] The localizations for the option description
+   * @property {string} [descriptionLocalized] The localized description for this option
    * @property {boolean} [required] Whether the option is required
    * @property {boolean} [autocomplete] Whether the autocomplete interaction is enabled for a
    * {@link ApplicationCommandOptionType.String}, {@link ApplicationCommandOptionType.Integer} or
@@ -367,12 +462,14 @@ class ApplicationCommand extends Base {
    * A choice for an application command option.
    * @typedef {Object} ApplicationCommandOptionChoice
    * @property {string} name The name of the choice
+   * @property {string} [nameLocalized] The localized name for this choice
+   * @property {Object<string, string>} [nameLocalizations] The localized names for this choice
    * @property {string|number} value The value of the choice
    */
 
   /**
    * Transforms an {@link ApplicationCommandOptionData} object into something that can be used with the API.
-   * @param {ApplicationCommandOptionData} option The option to transform
+   * @param {ApplicationCommandOptionData|ApplicationCommandOption} option The option to transform
    * @param {boolean} [received] Whether this option has been received from Discord
    * @returns {APIApplicationCommandOption}
    * @private
@@ -381,18 +478,31 @@ class ApplicationCommand extends Base {
     const channelTypesKey = received ? 'channelTypes' : 'channel_types';
     const minValueKey = received ? 'minValue' : 'min_value';
     const maxValueKey = received ? 'maxValue' : 'max_value';
+    const nameLocalizationsKey = received ? 'nameLocalizations' : 'name_localizations';
+    const nameLocalizedKey = received ? 'nameLocalized' : 'name_localized';
+    const descriptionLocalizationsKey = received ? 'descriptionLocalizations' : 'description_localizations';
+    const descriptionLocalizedKey = received ? 'descriptionLocalized' : 'description_localized';
     return {
       type: option.type,
       name: option.name,
+      [nameLocalizationsKey]: option.nameLocalizations ?? option.name_localizations,
+      [nameLocalizedKey]: option.nameLocalized ?? option.name_localized,
       description: option.description,
+      [descriptionLocalizationsKey]: option.descriptionLocalizations ?? option.description_localizations,
+      [descriptionLocalizedKey]: option.descriptionLocalized ?? option.description_localized,
       required:
         option.required ??
         (option.type === ApplicationCommandOptionType.Subcommand ||
         option.type === ApplicationCommandOptionType.SubcommandGroup
           ? undefined
           : false),
       autocomplete: option.autocomplete,
-      choices: option.choices,
+      choices: option.choices?.map(choice => ({
+        name: choice.name,
+        [nameLocalizedKey]: choice.nameLocalized ?? choice.name_localized,
+        [nameLocalizationsKey]: choice.nameLocalizations ?? choice.name_localizations,
+        value: choice.value,
+      })),
       options: option.options?.map(o => this.transformOption(o, received)),
       [channelTypesKey]: option.channelTypes ?? option.channel_types,
       [minValueKey]: option.minValue ?? option.min_value,

packages/discord.js/src/structures/AutocompleteInteraction.js

@@ -60,7 +60,7 @@ class AutocompleteInteraction extends Interaction {
 
   /**
    * Sends results for the autocomplete of this interaction.
-   * @param {ApplicationCommandOptionChoice[]} options The options for the autocomplete
+   * @param {ApplicationCommandOptionChoiceData[]} options The options for the autocomplete
    * @returns {Promise<void>}
    * @example
    * // respond to autocomplete interaction