refactor: Add type annotations for response objects in API request handling

src/app/api/cron/cleanup/route.ts

@@ -50,7 +50,7 @@ export async function POST(request: Request) {
             for (const part of parts[0] as FilePart[]) {
               if (!part.discord_message_id) continue;
               try {
-                const res = await rateLimiter.request(
+                const res: Response = await rateLimiter.request(
                   `/channels/${process.env.DISCORD_CHANNEL_ID}/messages/${part.discord_message_id}`,
                   {
                     method: 'DELETE',
@@ -89,7 +89,7 @@ export async function POST(request: Request) {
             for (const part of partsRows[0] as FilePart[]) {
               if (!part.discord_message_id) continue;
               try {
-                const res = await rateLimiter.request(
+                const res: Response = await rateLimiter.request(
                   `/channels/${process.env.DISCORD_CHANNEL_ID}/messages/${part.discord_message_id}`,
                   {
                     method: 'DELETE',

src/app/api/delete/route.ts

@@ -54,7 +54,7 @@ export async function POST(request: Request) {
         if (!part.discord_message_id) continue;
 
         try {
-          const res = await rateLimiter.request(
+          const res: Response = await rateLimiter.request(
             `/channels/${process.env.DISCORD_CHANNEL_ID}/messages/${part.discord_message_id}`,
             {
               method: 'DELETE',

src/app/api/download-part/[file_id]/[part_index]/route.ts

@@ -16,6 +16,16 @@ interface RouteContext {
   }>;
 }
 
+interface DiscordAttachment {
+  url: string;
+  filename: string;
+  size: number;
+}
+
+interface DiscordMessageData {
+  attachments: DiscordAttachment[];
+}
+
 if (!process.env.DISCORD_BOT_TOKEN || !process.env.DISCORD_CHANNEL_ID) {
   throw new Error('Discord bot token or channel ID is not configured');
 }
@@ -48,7 +58,7 @@ export async function GET(request: NextRequest, context: RouteContext) {
     }
 
     // 1. Get fresh message data from Discord
-    const messageData = await rateLimiter.request(
+    const messageData: DiscordMessageData = await rateLimiter.request<DiscordMessageData>(
       `/channels/${process.env.DISCORD_CHANNEL_ID}/messages/${part.discord_message_id}`
     );
 

src/app/api/upload-part/route.ts

@@ -8,8 +8,6 @@ if (!process.env.DISCORD_BOT_TOKEN || !process.env.DISCORD_CHANNEL_ID) {
   throw new Error('Please define DISCORD_BOT_TOKEN and DISCORD_CHANNEL_ID in .env.local');
 }
 
-const DISCORD_API_URL = `https://discord.com/api/v10/channels/${process.env.DISCORD_CHANNEL_ID}/messages`;
-
 const rateLimiter = new DiscordRateLimiter(DISCORD_API_BASE_URL, process.env.DISCORD_BOT_TOKEN);
 
 export async function POST(request: Request) {
@@ -27,7 +25,7 @@ export async function POST(request: Request) {
     const discordFormData = new FormData();
     discordFormData.append('file', chunk, `chunk-${partIndex}.bin`);
 
-    const discordRes = await rateLimiter.request(
+    const discordRes: Response = await rateLimiter.request(
       `/channels/${process.env.DISCORD_CHANNEL_ID}/messages`,
       {
         method: 'POST',

src/lib/discordRateLimiter.ts

@@ -19,12 +19,16 @@ export class DiscordRateLimiter {
   public async request<T>(path: string, options: RequestInit = {}): Promise<T> {
     const url = `${this.baseUrl}${path}`;
 
-    const headers = {
+    const headers: Record<string, string> = {
       'Authorization': `Bot ${this.botToken}`,
-      'Content-Type': 'application/json',
-      ...options.headers,
+      ...(options.headers as Record<string, string>),
     };
 
+    // Only set Content-Type to application/json if body is a string and not explicitly set
+    if (typeof options.body === 'string' && !('Content-Type' in headers)) {
+      headers['Content-Type'] = 'application/json';
+    }
+
     const response = await fetch(url, { ...options, headers });
 
     if (response.status === 429) {