build: migrate eslint to v10 flat config and upgrade typescript

Replace .eslintrc.json with eslint.config.js using the new flat config
format required by ESLint 10. Swap @typescript-eslint/eslint-plugin and
@typescript-eslint/parser for the unified typescript-eslint package.
Upgrade TypeScript to 5.9 and @types/node to 25. Apply automatic code
fixes: remove unused catch bindings and preserve error cause in auth
header parsing.

lib/api-functions.ts

@@ -103,7 +103,7 @@ export async function connectionRequest(
   let remoteAddress;
   try {
     remoteAddress = new URL(connectionRequestUrl).hostname;
-  } catch (err) {
+  } catch {
     return "Invalid connection request URL";
   }
 
@@ -185,7 +185,7 @@ export async function connectionRequest(
         () => true,
         () => false,
       );
-    } catch (err) {
+    } catch {
       // Ignore invalid address
     }
   }

lib/auth.ts

@@ -25,7 +25,7 @@ function parseHeaderFeilds(str: string): Record<string, string> {
       try {
         value = JSON.parse(value);
       } catch (error) {
-        throw new Error("Unable to parse auth header");
+        throw new Error("Unable to parse auth header", { cause: error });
       }
     }
     res[name.trim()] = value;

lib/connection-request.ts

@@ -157,7 +157,7 @@ export async function httpConnectionRequest(
         authHeader = auth.parseWwwAuthenticateHeader(
           res.headers["www-authenticate"],
         );
-      } catch (err) {
+      } catch {
         return "Connection request error: Error parsing www-authenticate header";
       }
       [username, password, authExp] = await extractAuth(authExp, false);

lib/cwmp.ts

@@ -89,7 +89,7 @@ async function authenticate(
       authentication = auth.parseAuthorizationHeader(
         sessionContext.httpRequest.headers["authorization"],
       );
-    } catch (err) {
+    } catch {
       return false;
     }
   }
@@ -1274,7 +1274,7 @@ async function clientError(
   body: string,
   msg: string,
 ): Promise<void> {
-  let debugEnabled = false;
+  let debugEnabled: boolean;
   let deviceId: string = null;
 
   if (sessionContext) {
@@ -1312,7 +1312,7 @@ async function clientError(
 function decodeString(buffer: Buffer, charset: string): string {
   try {
     return buffer.toString(charset as BufferEncoding);
-  } catch (err) {
+  } catch {
     if (encodingExists(charset)) return decode(buffer, charset);
   }
   return null;
@@ -1383,7 +1383,7 @@ async function listenerAsync(
     // connection is closed before the stream is finished.
     // For Node 12.9+ we can just use stream.readableEnded
     if (!readableEnded) throw new Error("Connection closed");
-  } catch (err) {
+  } catch {
     return;
   }
 

lib/cwmp/db.ts

@@ -78,7 +78,7 @@ export async function fetchDevice(
 
     try {
       res.push([Path.parse(path), t, attrs]);
-    } catch (err) {
+    } catch {
       // The path parser is now more strict so we might be in a situation where
       // the database contains invalid paths from before this change So here we
       // encode the invalid characters.

lib/cwmp/local-cache.ts

@@ -82,7 +82,7 @@ async function fetchPresets(): Promise<[string, Preset[]]> {
       try {
         schedule.duration = +parts.shift() * 1000;
         schedule.schedule = scheduling.parseCron(parts.join(" "));
-      } catch (err) {
+      } catch {
         logger.warn({
           message: "Invalid preset schedule",
           preset: preset["_id"],
@@ -97,7 +97,7 @@ async function fetchPresets(): Promise<[string, Preset[]]> {
     if (preset["precondition"]) {
       try {
         precondition = parse(preset["precondition"]);
-      } catch (error) {
+      } catch {
         precondition = convertOldPrecondition(
           JSON.parse(preset["precondition"]),
         );

lib/forwarded.ts

@@ -20,12 +20,12 @@ const cidrs: [IPv4 | IPv6, number][] = [];
 for (const str of FORWARDED_HEADER.split(",").map((s) => s.trim())) {
   try {
     cidrs.push(parseCIDR(str));
-  } catch (err) {
+  } catch {
     // Not a valid CIDR format, try parsing as IP
     try {
       const ip = parse(str);
       cidrs.push([ip, ip.toByteArray().length * 8]);
-    } catch (err) {
+    } catch {
       // Not a valid IP either, ignore
     }
   }

lib/fs.ts

@@ -70,7 +70,7 @@ function matchEtag(etag: string, header: string): boolean {
     if (t.startsWith("W/")) t = t.substring(2);
     try {
       t = JSON.parse(t);
-    } catch (e) {
+    } catch {
       // Ignore
     }
     if (t === "*") return true;

lib/nbi.ts

@@ -501,7 +501,7 @@ async function handler(
       };
       try {
         await filesBucket.delete(filename as unknown as ObjectId);
-      } catch (err) {
+      } catch {
         // Ignore error if file doesn't exist
       }
 

lib/server.ts

@@ -93,7 +93,7 @@ export function start(
           res.writeHead(500, { Connection: "close" });
           res.end(`${err.name}: ${err.message}`);
         }
-      } catch (err) {
+      } catch {
         // Ignore
       }
       throw err;

lib/soap.ts

@@ -119,7 +119,7 @@ function parameterInfoList(xml: Element): [Path, boolean, boolean][] {
         if (param && !param.endsWith("."))
           return [Path.parse(param), false, parsed];
         else return [Path.parse(param.slice(0, -1)), true, parsed];
-      } catch (err) {
+      } catch {
         warnings.push({
           message: "Missing or invalid XML node",
           element: "Name",
@@ -201,7 +201,7 @@ function parameterValueList(
       }
       try {
         return [Path.parse(param), parsed, valueType];
-      } catch (err) {
+      } catch {
         warnings.push({
           message: "Missing or invalid XML node",
           element: "Name",
@@ -250,7 +250,7 @@ function parameterAttributeList(xml: Element): [Path, number, string[]][] {
 
       try {
         return [Path.parse(param), notification, accessList];
-      } catch (err) {
+      } catch {
         warnings.push({
           message: "Missing or invalid XML node",
           element: "Name",

lib/ui/api.ts

@@ -519,7 +519,7 @@ router.put("/files/:id", async (ctx) => {
 
   try {
     await db.deleteFile(id);
-  } catch (err) {
+  } catch {
     // File doesn't exist, ignore
   }
 

lib/ui/db.ts

@@ -260,7 +260,7 @@ function flattenPreset(
     try {
       // Try parse to check expression validity
       parse(p.precondition as string);
-    } catch (error) {
+    } catch {
       p.precondition = convertOldPrecondition(
         JSON.parse(p.precondition as string),
       );

lib/xml-parser.ts

@@ -41,7 +41,7 @@ export function parseXmlDeclaration(buffer: Buffer): Attribute[] {
       str = str.slice(0, str.indexOf("?>"));
       try {
         return parseAttrs(str.slice(5));
-      } catch (err) {
+      } catch {
         // Ignore
       }
     }