diff --git a/lib/routes/telegram/tglib/channel.ts b/lib/routes/telegram/tglib/channel.ts
index 7af7cc50c82b91..ef8f91fe5c379e 100644
--- a/lib/routes/telegram/tglib/channel.ts
+++ b/lib/routes/telegram/tglib/channel.ts
@@ -2,6 +2,8 @@ import InvalidParameterError from '@/errors/types/invalid-parameter';
 import { client, decodeMedia, getClient, getFilename, getMediaLink, streamDocument, streamThumbnail } from './client';
 import { returnBigInt as bigInt } from 'telegram/Helpers';
 import { HTMLParser } from 'telegram/extensions/html';
+import { DataItem } from '@/types';
+import type { Api } from 'telegram';
 
 function parseRange(range, length) {
     if (!range) {
@@ -111,24 +113,25 @@ async function getMedia(ctx) {
 }
 
 export default async function handler(ctx) {
+    const { username } = ctx.req.param();
     const client = await getClient();
 
-    const item = [];
-    const chat = await client.getInputEntity(ctx.req.param('username'));
+    const item: DataItem[] = [];
+    const chat = (await client.getInputEntity(username)) as Api.InputPeerChannel;
     const channelInfo = await client.getEntity(chat);
 
     if (channelInfo.className !== 'Channel') {
-        throw new Error(`${ctx.req.param('username')} is not a channel`);
+        throw new Error(`${username} is not a channel`);
     }
 
-    let attachments = [];
+    let attachments: string[] = [];
     const messages = await client.getMessages(chat, { limit: 50 });
 
     for (const message of messages) {
         if (message.media) {
             // messages that have no text are shown as if they're one post
             // because in TG only 1 attachment per message is possible
-            attachments.push(getMediaLink(ctx, chat, ctx.req.param('username'), message));
+            attachments.push(getMediaLink(ctx, chat, username, message));
         }
         if (message.text !== '') {
             let description = attachments.join('\n');
@@ -144,8 +147,8 @@ export default async function handler(ctx) {
                 title,
                 description,
                 pubDate: new Date(message.date * 1000).toUTCString(),
-                link: `https://t.me/s/${ctx.req.param('username')}/${message.id}`,
-                author: `${channelInfo.title} (@${ctx.req.param('username')})`,
+                link: `https://t.me/s/${username}/${message.id}`,
+                author: `${channelInfo.title} (@${username})`,
             });
         }
     }
@@ -153,10 +156,10 @@ export default async function handler(ctx) {
     return {
         title: channelInfo.title,
         language: null,
-        link: `https://t.me/${ctx.req.param('username')}`,
+        link: `https://t.me/${username}`,
         item,
         allowEmpty: ctx.req.param('id') === 'allow_empty',
-        description: `@${ctx.req.param('username')} on Telegram`,
+        description: `@${username} on Telegram`,
     };
 }
 
diff --git a/lib/routes/telegram/tglib/client.ts b/lib/routes/telegram/tglib/client.ts
index 06ed2538cae8b1..00afc8f539faf7 100644
--- a/lib/routes/telegram/tglib/client.ts
+++ b/lib/routes/telegram/tglib/client.ts
@@ -81,7 +81,7 @@ function ExpandInlineBytes(bytes) {
     return real;
 }
 
-function getMediaLink(ctx, channel, channelName, message) {
+function getMediaLink(ctx, channel: Api.InputPeerChannel, channelName: string, message: Api.Message) {
     const base = `${ctx.protocol}://${ctx.host}/telegram/channel/${channelName}`;
     const src = base + `${channel.channelId}_${message.id}`;
 
@@ -102,7 +102,7 @@ function getMediaLink(ctx, channel, channelName, message) {
         linkText += ` (${humanFileSize(x.document.size)})`;
         return `<a href="${src}" target="_blank"><img src="${src}?thumb" alt=""/><br/>${linkText}</a>`;
     }
-    return;
+    return '';
 }
 function getFilename(x) {
     if (x instanceof Api.MessageMediaDocument) {