chore(lint): reduce warning debt across core adapters and model clients

src/channels/whatsapp/adapter.ts

@@ -57,6 +57,10 @@ interface WhatsAppMessage {
   type?: string;
   /** Download the media attached to this message. */
   downloadMedia?: () => Promise<{ mimetype: string; data: string; filename?: string } | null>;
+  /** Chat handle for typing indicator. */
+  getChat?: () => Promise<{ sendStateTyping: () => Promise<void> }>;
+  /** Mentioned user IDs in message metadata. */
+  mentionedIds?: string[];
 }
 
 /**
@@ -110,34 +114,41 @@ export class WhatsAppAdapter implements ChannelAdapter {
           args: puppeteerArgs,
         },
       });
+      const client = this.client;
+      if (!client) {
+        throw new Error('WhatsApp client initialization failed');
+      }
 
       // Promise that resolves on 'ready' or rejects on 'auth_failure'
       const readyPromise = new Promise<void>((resolve, reject) => {
-        this.client!.on('ready', () => {
+        client.on('ready', () => {
           console.log('WhatsApp bot connected');
           this._status = 'connected';
           // Capture bot's own JID for mention detection
-          this.botId = (this.client as any)?.info?.wid?._serialized;
+          const clientInfo = client as InstanceType<typeof Client> & {
+            info?: { wid?: { _serialized?: string } };
+          };
+          this.botId = clientInfo.info?.wid?._serialized;
           resolve();
         });
 
-        this.client!.on('auth_failure', (msg: string) => {
+        client.on('auth_failure', (msg: string) => {
           this._status = 'error';
           reject(new Error(`WhatsApp auth failure: ${msg}`));
         });
 
-        this.client!.on('qr', (qr: string) => {
+        client.on('qr', (qr: string) => {
           console.log('WhatsApp QR code received. Scan with your phone:');
           console.log(qr);
         });
       });
 
       // Register message event handler
-      this.client.on('message', (message: unknown) => {
+      client.on('message', (message: unknown) => {
         this.handleMessage(message as WhatsAppMessage);
       });
 
-      await this.client.initialize();
+      await client.initialize();
       await readyPromise;
     } catch (error) {
       this._status = 'error';
@@ -234,7 +245,7 @@ export class WhatsAppAdapter implements ChannelAdapter {
         requireMention: this.config.requireMention,
         defaultRequireMention: true,
         mentionsBot: message.body?.includes(`@${this.botId.replace(/@c\.us$/, '')}`) ||
-          (message as unknown as { mentionedIds?: string[] }).mentionedIds?.some((id) => id === this.botId) === true,
+          message.mentionedIds?.some((id) => id === this.botId) === true,
       })) {
         // WhatsApp mentions use @phone_number format in body
         // Also check for mentions in the message mentionedIds
@@ -269,8 +280,8 @@ export class WhatsAppAdapter implements ChannelAdapter {
 
     // Send typing indicator
     try {
-      const chat = await (message as any).getChat();
-      await chat.sendStateTyping();
+      const chat = await message.getChat?.();
+      await chat?.sendStateTyping();
     } catch { /* ignore typing errors */ }
 
     // Strip bot mention from message body for group messages
@@ -286,7 +297,7 @@ export class WhatsAppAdapter implements ChannelAdapter {
     const attachments: Attachment[] = [];
     if (message.hasMedia) {
       try {
-        const media = await (message as any).downloadMedia();
+        const media = await message.downloadMedia?.();
         if (media && typeof media.mimetype === 'string') {
           const mimeType = media.mimetype;
           const isAudio = mimeType.startsWith('audio/');