fix: migrate ESLint config to v9 flat config format

update lint script to use --config flag.
move ignore patterns from .eslintignore to eslint.config.mjs.
remove deprecated CLI options.

Author: 0xgouda

.config/eslint.config.mjs

@@ -9,6 +9,24 @@ import { defineConfig } from 'eslint/config';
 import grafanaConfig from '@grafana/eslint-config/flat.js';
 
 export default defineConfig([
+  {
+    ignores: [
+      'node_modules/**',
+      'dist/**',
+      'build/**',
+      '*.tsbuildinfo',
+      'coverage/**',
+      '.nyc_output/**',
+      '**/*.min.js',
+      '**/*.min.css',
+      '*.zip',
+      '*.tar.gz',
+      '*.log',
+      'logs/**',
+      '.cache/**',
+      '.eslintcache',
+    ],
+  },
   ...grafanaConfig,
   {
     rules: {

.eslintignore

@@ -9,7 +9,7 @@
     "test:ci": "jest --passWithNoTests --maxWorkers 4",
     "typecheck": "tsc --noEmit",
     "scope-bootstrap": "node scripts/scope-bootstrap.js",
-    "lint": "eslint --cache --ignore-path ./.gitignore --ext .js,.jsx,.ts,.tsx .",
+    "lint": "eslint --config .config/eslint.config.mjs --cache .",
     "lint:fix": "npm run lint -- --fix",
     "e2e": "npm exec cypress install && npm exec grafana-e2e run",
     "e2e:update": "npm exec cypress install && npm exec grafana-e2e run --update-screenshots",