feat: add support for application command events (#5596)

src/client/websocket/handlers/APPLICATION_COMMAND_CREATE.js

@@ -0,0 +1,22 @@
+'use strict';
+
+const { Events } = require('../../../util/Constants');
+
+module.exports = (client, { d: data }) => {
+  let command;
+
+  if (data.guild_id) {
+    const guild = client.guilds.cache.get(data.guild_id);
+    if (!guild) return;
+    command = guild.commands.add(data);
+  } else {
+    command = client.application.commands.add(data);
+  }
+
+  /**
+   * Emitted when an application command is created.
+   * @event Client#applicationCommandCreate
+   * @param {ApplicationCommand} command The command which was created
+   */
+  client.emit(Events.APPLICATION_COMMAND_CREATE, command);
+};

src/client/websocket/handlers/APPLICATION_COMMAND_DELETE.js

@@ -0,0 +1,24 @@
+'use strict';
+
+const { Events } = require('../../../util/Constants');
+
+module.exports = (client, { d: data }) => {
+  let command;
+
+  if (data.guild_id) {
+    const guild = client.guilds.cache.get(data.guild_id);
+    if (!guild) return;
+    command = guild.commands.add(data);
+    guild.commands.cache.delete(data.id);
+  } else {
+    command = client.application.commands.add(data);
+    client.application.commands.cache.delete(data.id);
+  }
+
+  /**
+   * Emitted when an application command is deleted.
+   * @event Client#applicationCommandDelete
+   * @param {ApplicationCommand} command The command which was deleted
+   */
+  client.emit(Events.APPLICATION_COMMAND_DELETE, command);
+};

src/client/websocket/handlers/APPLICATION_COMMAND_UPDATE.js

@@ -0,0 +1,26 @@
+'use strict';
+
+const { Events } = require('../../../util/Constants');
+
+module.exports = (client, { d: data }) => {
+  let oldCommand;
+  let newCommand;
+
+  if (data.guild_id) {
+    const guild = client.guilds.cache.get(data.guild_id);
+    if (!guild) return;
+    oldCommand = guild.commands.cache.get(data.id)?._clone() ?? null;
+    newCommand = guild.commands.add(data);
+  } else {
+    oldCommand = client.application.commands.cache.get(data.id)?._clone() ?? null;
+    newCommand = client.application.commands.add(data);
+  }
+
+  /**
+   * Emitted when an application command is updated.
+   * @event Client#applicationCommandUpdate
+   * @param {?ApplicationCommand} oldCommand The command before the update
+   * @param {ApplicationCommand} newCommand The command after the update
+   */
+  client.emit(Events.APPLICATION_COMMAND_UPDATE, oldCommand, newCommand);
+};