feat(client): setChatUsername method

packages/client/src/client.ts

@@ -32,6 +32,7 @@ import { setChatDefaultPermissions } from './methods/chats/set-chat-default-perm
 import { setChatDescription } from './methods/chats/set-chat-description'
 import { setChatPhoto } from './methods/chats/set-chat-photo'
 import { setChatTitle } from './methods/chats/set-chat-title'
+import { setChatUsername } from './methods/chats/set-chat-username'
 import { setSlowMode } from './methods/chats/set-slow-mode'
 import { unarchiveChats } from './methods/chats/unarchive-chats'
 import { downloadAsBuffer } from './methods/files/download-buffer'
@@ -603,6 +604,20 @@ export class TelegramClient extends BaseTelegramClient {
     setChatTitle(chatId: InputPeerLike, title: string): Promise<void> {
         return setChatTitle.apply(this, arguments)
     }
+    /**
+     * Change supergroup/channel username
+     *
+     * You must be an administrator and have the appropriate permissions.
+     *
+     * @param chatId  Chat ID or current username
+     * @param username  New username, or `null` to remove
+     */
+    setChatUsername(
+        chatId: InputPeerLike,
+        username: string | null
+    ): Promise<void> {
+        return setChatUsername.apply(this, arguments)
+    }
     /**
      * Set supergroup's slow mode interval.
      *

packages/client/src/methods/chats/set-chat-username.ts

@@ -0,0 +1,31 @@
+import { TelegramClient } from '../../client'
+import {
+    InputPeerLike,
+    MtCuteInvalidPeerTypeError,
+} from '../../types'
+import { normalizeToInputChannel } from '../../utils/peer-utils'
+
+/**
+ * Change supergroup/channel username
+ *
+ * You must be an administrator and have the appropriate permissions.
+ *
+ * @param chatId  Chat ID or current username
+ * @param username  New username, or `null` to remove
+ * @internal
+ */
+export async function setChatUsername(
+    this: TelegramClient,
+    chatId: InputPeerLike,
+    username: string | null
+): Promise<void> {
+    const chat = normalizeToInputChannel(await this.resolvePeer(chatId))
+    if (!chat)
+        throw new MtCuteInvalidPeerTypeError(chatId, 'channel')
+
+    await this.call({
+        _: 'channels.updateUsername',
+        channel: chat,
+        username: username || ''
+    })
+}