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.

.eslintrc.json

@@ -1,36 +0,0 @@
-{
-  "env": {
-    "es2022": true,
-    "node": true
-  },
-  "parser": "@typescript-eslint/parser",
-  "parserOptions": {
-    "project": "./tsconfig.json"
-  },
-  "plugins": ["@typescript-eslint"],
-  "extends": [
-    "eslint:recommended",
-    "plugin:@typescript-eslint/recommended",
-    "prettier"
-  ],
-  "rules": {
-    "no-shadow": ["error", { "allow": ["err"] }],
-    "handle-callback-err": "error",
-    "prefer-arrow-callback": "error",
-    "no-buffer-constructor": "error",
-    "prefer-const": ["error", { "destructuring": "all" }],
-    "eqeqeq": ["error", "always", { "null": "ignore" }],
-    "@typescript-eslint/no-explicit-any": 0,
-    "@typescript-eslint/no-use-before-define": [
-      "error",
-      { "functions": false }
-    ],
-    "@typescript-eslint/explicit-function-return-type": [
-      "error",
-      { "allowExpressions": true }
-    ],
-    "@typescript-eslint/no-floating-promises": "error",
-    "@typescript-eslint/no-misused-promises": "error",
-    "no-prototype-builtins": 0
-  }
-}

bin/genieacs-ext.ts

@@ -55,6 +55,7 @@ process.on("message", (message) => {
   if (!script) {
     const cwd = process.env["GENIEACS_EXT_DIR"];
     process.chdir(cwd);
+    // eslint-disable-next-line @typescript-eslint/no-require-imports
     script = require(`${cwd}/${fileName}`);
   }
 

eslint.config.mjs

@@ -0,0 +1,54 @@
+import { defineConfig } from "@eslint/config-helpers";
+import eslint from "@eslint/js";
+import tseslint from "typescript-eslint";
+import eslintConfigPrettier from "eslint-config-prettier";
+import globals from "globals";
+
+export default defineConfig(
+  {
+    ignores: ["dist/", "test/*.js"],
+  },
+  eslint.configs.recommended,
+  ...tseslint.configs.recommended,
+  eslintConfigPrettier,
+  {
+    languageOptions: {
+      globals: {
+        ...globals.es2022,
+        ...globals.node,
+      },
+      parserOptions: {
+        projectService: true,
+        tsconfigRootDir: import.meta.dirname,
+      },
+    },
+    rules: {
+      "no-shadow": ["error", { allow: ["err"] }],
+      "handle-callback-err": "error",
+      "prefer-arrow-callback": "error",
+      "no-buffer-constructor": "error",
+      "prefer-const": ["error", { destructuring: "all" }],
+      eqeqeq: ["error", "always", { null: "ignore" }],
+      "@typescript-eslint/no-explicit-any": "off",
+      "@typescript-eslint/no-use-before-define": [
+        "error",
+        { functions: false },
+      ],
+      "@typescript-eslint/explicit-function-return-type": [
+        "error",
+        { allowExpressions: true },
+      ],
+      "@typescript-eslint/no-floating-promises": "error",
+      "@typescript-eslint/no-misused-promises": "error",
+      "no-prototype-builtins": "off",
+    },
+  },
+  {
+    files: ["ui/**/*.ts", "ui/**/*.tsx"],
+    languageOptions: {
+      globals: {
+        ...globals.browser,
+      },
+    },
+  },
+);

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
       }
     }

package.json

@@ -48,26 +48,27 @@
     "@codemirror/language": "^6.12.2",
     "@codemirror/state": "^6.5.4",
     "@codemirror/view": "^6.39.16",
+    "@eslint/js": "^10.0.1",
     "@tailwindcss/cli": "^4.2.1",
     "@tailwindcss/forms": "^0.5.11",
     "@types/jsonwebtoken": "^9.0.10",
     "@types/koa": "^2.15.0",
     "@types/koa-compress": "^4.0.7",
     "@types/mithril": "^2.2.7",
-    "@types/node": "^20.19.37",
+    "@types/node": "^25.3.5",
     "@types/parsimmon": "^1.10.9",
     "@types/seedrandom": "^3.0.8",
-    "@typescript-eslint/eslint-plugin": "^7.18.0",
-    "@typescript-eslint/parser": "^7.18.0",
     "esbuild": "^0.27.4",
-    "eslint": "^8.57.1",
+    "eslint": "^10.0.3",
-    "eslint-config-prettier": "^9.1.2",
+    "eslint-config-prettier": "^10.1.8",
+    "globals": "^17.4.0",
     "mithril": "^2.3.8",
     "prettier": "^3.8.1",
     "sql.js": "^1.14.1",
     "svgo": "^3.3.3",
     "tailwindcss": "^4.2.1",
     "typescript": "^5.9.3",
+    "typescript-eslint": "^8.56.1",
     "yaml": "^1.10.2"
   },
   "engines": {

ui/.eslintrc.json

@@ -1,6 +0,0 @@
-{
-  "env": {
-    "browser": true,
-    "node": false
-  }
-}

ui/autocomplete-compnent.ts

@@ -119,7 +119,9 @@ export default class Autocomplete {
       if (!this.visible) {
         if (!this.hideTimeout) {
           document.body.appendChild(this.container);
-          window.getComputedStyle(this.container).opacity;
+          // Force style recalc so the initial opacity is resolved before
+          // setting it to "1", allowing the CSS transition to play.
+          void window.getComputedStyle(this.container).opacity;
         } else {
           clearTimeout(this.hideTimeout);
           this.hideTimeout = null;

ui/components/ping.ts

@@ -47,7 +47,7 @@ const component: ClosureComponent = (vn): Component => {
       try {
         const url = new URL(param.value[0]);
         h = url.hostname;
-      } catch (err) {
+      } catch {
         // Ignore
       }
 

ui/config-page.ts

@@ -31,7 +31,7 @@ function putActionHandler(action, _object, isNew?): Promise<ValidationErrors> {
 
       try {
         object.value = stringify(parse(object.value || ""));
-      } catch (err) {
+      } catch {
         return void resolve({
           value: "Config value must be valid expression",
         });

ui/filter-component.ts

@@ -83,7 +83,7 @@ const component: ClosureComponent<Attrs> = (initialVnode) => {
     const list = filterList.map((f, idx) => {
       try {
         return parseFilter(attrs.resource, f);
-      } catch (err) {
+      } catch {
         filterInvalid |= 1 << idx;
       }
       return null;

ui/permissions-page.ts

@@ -90,7 +90,7 @@ function putActionHandler(action, _object, isNew): Promise<ValidationErrors> {
       if (object.filter) {
         try {
           object.filter = stringify(memoizedParse(object.filter));
-        } catch (err) {
+        } catch {
           return void resolve({
             filter: "Filter must be valid expression",
           });
@@ -100,7 +100,7 @@ function putActionHandler(action, _object, isNew): Promise<ValidationErrors> {
       if (object.validate) {
         try {
           object.validate = stringify(memoizedParse(object.validate));
-        } catch (err) {
+        } catch {
           return void resolve({
             validate: "Validate must be valid expression",
           });

ui/presets-page.ts

@@ -72,7 +72,7 @@ function putActionHandler(action, _object, isNew): Promise<ValidationErrors> {
       if (object.precondition) {
         try {
           object.precondition = stringify(memoizedParse(object.precondition));
-        } catch (err) {
+        } catch {
           return void resolve({
             precondition: "Precondition must be valid expression",
           });

ui/store.ts

@@ -113,7 +113,7 @@ function checkConnection(): void {
             setTimestamp(now2);
             m.redraw();
           }
-        } catch (err) {
+        } catch {
           // Ignore in case of missing or invalid Date header
         }
 
@@ -200,7 +200,9 @@ export async function xhrRequest(
       try {
         response = xhr.responseText ? JSON.parse(xhr.responseText) : null;
       } catch (err) {
-        throw new Error("Invalid JSON: " + xhr.responseText.slice(0, 80));
+        throw new Error("Invalid JSON: " + xhr.responseText.slice(0, 80), {
+          cause: err,
+        });
       }
     } else {
       response = xhr.responseText;