Update to eslint v9

eslint.config.mjs

@@ -0,0 +1,47 @@
+import js from '@eslint/js';
+import prettierEslint from 'eslint-config-prettier';
+import tseslint from 'typescript-eslint';
+
+export default tseslint.config({
+    extends: [js.configs.recommended, prettierEslint, ...tseslint.configs.strictTypeChecked],
+    ignores: ['**/app/', '**/dist/'],
+    rules: {
+        'arrow-parens': 'error',
+        eqeqeq: 'error',
+        'grouped-accessor-pairs': 'error',
+        'no-console': 'error',
+        'no-extra-parens': 'off',
+        'no-loss-of-precision': 'error',
+        'no-sequences': 'error',
+        'no-template-curly-in-string': 'error',
+        'no-throw-literal': 'error',
+        'no-unused-expressions': 'error',
+        'no-useless-concat': 'error',
+        'no-var': 'error',
+        radix: 'error',
+        semi: 'error',
+        'sort-imports': [
+            'error',
+            {
+                // only sort inside groups, not between separate import lines
+                ignoreDeclarationSort: true,
+            },
+        ],
+        // disabled rules
+        'sort-keys': 'off',
+        '@typescript-eslint/no-inferrable-types': 'off',
+        '@typescript-eslint/no-empty-function': 'off',
+        '@typescript-eslint/no-deprecated': 'off',
+        '@typescript-eslint/restrict-template-expressions': 'off',
+        '@typescript-eslint/no-confusing-void-expression': 'off',
+        '@typescript-eslint/no-unnecessary-condition': 'off',
+    },
+    languageOptions: {
+        parserOptions: {
+            projectService: {
+                allowDefaultProject: ['eslint.config.mjs', 'src/map/plotly/plotly-scatter.js'],
+            },
+            tsconfigRootDir: import.meta.dirname,
+        },
+    },
+});