Eslint upgrade to v9

eslint.config.mjs

@@ -0,0 +1,145 @@
+import eslint from "@eslint/js";
+import tseslint from "@typescript-eslint/eslint-plugin";
+import tsParser from "@typescript-eslint/parser";
+import prettierConfig from "eslint-config-prettier";
+import i18nextPlugin from "eslint-plugin-i18next";
+import mdxPlugin from "eslint-plugin-mdx";
+import prettierPlugin from "eslint-plugin-prettier";
+import reactPlugin from "eslint-plugin-react";
+import reactHooksPlugin from "eslint-plugin-react-hooks";
+import globals from "globals";
+
+export default [
+  // Base configuration
+  {
+    ignores: [
+      "**/dist",
+      "**/public",
+      "**/lib",
+      "**/build",
+      "**/*.bs.js",
+      "**/*.gen.tsx",
+      "**/*.res",
+      "**/*.css",
+      "**/*.csv",
+      "**/Dockerfile",
+    ],
+  },
+  eslint.configs.recommended,
+  prettierConfig,
+
+  // Global settings for all JavaScript/TypeScript files
+  {
+    files: ["**/*.{js,jsx,ts,tsx,mjs,mts}"],
+    languageOptions: {
+      ecmaVersion: 12,
+      sourceType: "module",
+      globals: {
+        ...globals.browser,
+        ...globals.node,
+      },
+      parserOptions: {
+        ecmaFeatures: {
+          jsx: true,
+        },
+      },
+    },
+    settings: {
+      react: {
+        version: "detect",
+      },
+    },
+    linterOptions: {
+      reportUnusedDisableDirectives: true,
+    },
+  },
+
+  // TypeScript-specific rules
+  {
+    files: ["**/*.{ts,tsx}"],
+    plugins: {
+      "@typescript-eslint": tseslint,
+    },
+    languageOptions: {
+      parser: tsParser,
+      parserOptions: {
+        project: "./tsconfig.json",
+      },
+    },
+    rules: {
+      ...tseslint.configs.recommended.rules,
+      "@typescript-eslint/no-unused-vars": [
+        "error",
+        {
+          argsIgnorePattern: "^_",
+          varsIgnorePattern: "^_",
+          caughtErrorsIgnorePattern: "^_",
+        },
+      ],
+      "@typescript-eslint/no-explicit-any": "warn",
+    },
+  },
+
+  // React-specific rules
+  {
+    files: ["**/*.{jsx,tsx}"],
+    plugins: {
+      react: reactPlugin,
+      "react-hooks": reactHooksPlugin,
+    },
+    rules: {
+      ...reactPlugin.configs.recommended.rules,
+      ...reactHooksPlugin.configs.recommended.rules,
+      "react/react-in-jsx-scope": "off", // Not needed in React 17+
+      "react/prop-types": "off",
+    },
+  },
+
+  // i18next plugin rules
+  {
+    files: ["**/*.{js,jsx,ts,tsx}"],
+    plugins: {
+      i18next: i18nextPlugin,
+    },
+    rules: {
+      ...i18nextPlugin.configs.recommended.rules,
+      "i18next/no-literal-string": [
+        "warn",
+        {
+          mode: "jsx-only",
+          "jsx-attributes": {
+            include: ["label", "placeholder", "error", "title"],
+            exclude: [".*"],
+          },
+          callees: {
+            exclude: [".*"],
+          },
+        },
+      ],
+    },
+  },
+
+  // Prettier rules
+  {
+    files: ["**/*.{js,jsx,ts,tsx}"],
+    plugins: {
+      prettier: prettierPlugin,
+    },
+    rules: {
+      "prettier/prettier": "error",
+    },
+  },
+
+  // MDX-specific rules
+  {
+    files: ["**/*.mdx"],
+    plugins: {
+      mdx: mdxPlugin,
+    },
+    ...mdxPlugin.configs.recommended,
+    rules: {
+      "react/jsx-no-target-blank": "off",
+      "i18next/no-literal-string": "off",
+    },
+  },
+];