feat: add Client#getApplication() (#90)

For the time being, we're preserving both methods – the /applications/@me route still doesn't have information about the team associated with the application unlike the /oauth2/applications/@me route.

index.d.ts

@@ -1726,13 +1726,19 @@ declare namespace Dysnomia {
     [key: string]: unknown;
   }
   interface OAuthApplicationInfo {
+    approximate_guild_count?: number;
     bot_public: boolean;
     bot_require_code_grant: boolean;
     cover_image?: string;
     custom_install_url?: string;
     description: string;
     flags?: number;
     guild_id?: string;
+    // The docs say that there can be a partial guild object attached,
+    // but as of 2023-07-25, there is no guild object attached in either
+    // endpoints, so we cannot determine how partial the guild object really is.
+    // Proceed with caution.
+    guild?: unknown;
     icon: string | null;
     id: string;
     install_params?: OAuthInstallParams;
@@ -2658,6 +2664,7 @@ declare namespace Dysnomia {
     executeWebhook(webhookID: string, token: string, options: WebhookPayload): Promise<void>;
     followChannel(channelID: string, webhookChannelID: string): Promise<ChannelFollow>;
     getActiveGuildThreads(guildID: string): Promise<ListedGuildThreads>;
+    getApplication(): Promise<OAuthApplicationInfo>;
     getArchivedThreads(channelID: string, type: "private", options?: GetArchivedThreadsOptions): Promise<ListedChannelThreads<PrivateThreadChannel>>;
     getArchivedThreads(channelID: string, type: "public", options?: GetArchivedThreadsOptions): Promise<ListedChannelThreads<PublicThreadChannel>>;
     getAutoModerationRule(guildID: string, ruleID: string): Promise<AutoModerationRule>;

lib/Client.js

@@ -1960,6 +1960,15 @@ class Client extends EventEmitter {
         });
     }
 
+    /**
+     * Get data on the application associated with this bot account.
+     * The returned data is similar to the `getOAuthApplication()` method with additional information.
+     * @returns {Promise<Object>} The bot's application data. Refer to [Discord's Documentation](https://discord.com/developers/docs/resources/application#application-object) for object structure
+     */
+    getApplication() {
+        return this.requestHandler.request("GET", Endpoints.APPLICATION, true);
+    }
+
     /**
     * Get all archived threads in a channel
     * @arg {String} channelID The ID of the channel
@@ -2485,8 +2494,8 @@ class Client extends EventEmitter {
     }
 
     /**
-    * Get data on the bot's OAuth2 application
-    * @returns {Promise<Object>} The bot's application data. Refer to [Discord's Documentation](https://discord.com/developers/docs/topics/oauth2#get-current-application-information) for object structure
+    * Get data on the bot's OAuth2 application. See also `getApplication()` for more info.
+    * @returns {Promise<Object>} The bot's application data. Refer to [Discord's Documentation](https://discord.com/developers/docs/resources/application#application-object) for object structure
     */
     getOAuthApplication() {
         return this.requestHandler.request("GET", Endpoints.OAUTH2_APPLICATION, true);

lib/rest/Endpoints.js

@@ -6,6 +6,7 @@ module.exports.BASE_URL = "/api/v" + REST_VERSION;
 module.exports.CDN_URL = "https://cdn.discordapp.com";
 module.exports.CLIENT_URL = "https://discord.com";
 
+module.exports.APPLICATION =                                                        "/applications/@me";
 module.exports.AUTO_MODERATION_RULES =                                 (guildID) => `/guilds/${guildID}/auto-moderation/rules`;
 module.exports.AUTO_MODERATION_RULE =                          (guildID, ruleID) => `/guilds/${guildID}/auto-moderation/rules/${ruleID}`;
 module.exports.ORIGINAL_INTERACTION_RESPONSE =            (appID, interactToken) => `/webhooks/${appID}/${interactToken}`;