chore(frontend): scaffold Vite React TypeScript application

frontend-s2s/eslint.config.ts

@@ -0,0 +1,36 @@
+import js from "@eslint/js";
+import { defineConfig, globalIgnores } from "eslint/config";
+import prettier from "eslint-config-prettier/flat";
+import reactHooks from "eslint-plugin-react-hooks";
+import reactRefresh from "eslint-plugin-react-refresh";
+import tseslint from "typescript-eslint";
+
+export default defineConfig([
+  globalIgnores(["dist/**", "coverage/**", "node_modules/**"]),
+  {
+    files: ["**/*.{ts,tsx}"],
+    extends: [js.configs.recommended, tseslint.configs.strictTypeChecked, tseslint.configs.stylisticTypeChecked],
+    languageOptions: { parserOptions: { projectService: true, tsconfigRootDir: import.meta.dirname } },
+    rules: {
+      "@typescript-eslint/consistent-type-imports": ["error", { fixStyle: "inline-type-imports" }],
+      "@typescript-eslint/no-import-type-side-effects": "error",
+      "@typescript-eslint/no-unnecessary-condition": "off",
+      "@typescript-eslint/restrict-template-expressions": ["error", { allowNumber: true }],
+      "@typescript-eslint/prefer-nullish-coalescing": ["error", { ignorePrimitives: { string: true } }],
+      "no-console": ["error", { allow: ["warn", "error"] }],
+      "no-debugger": "error",
+      curly: ["error", "all"],
+      eqeqeq: ["error", "always", { null: "ignore" }],
+    },
+  },
+  {
+    files: ["src/**/*.{ts,tsx}"],
+    plugins: { "react-hooks": { rules: reactHooks.rules }, "react-refresh": reactRefresh },
+    rules: {
+      ...reactHooks.configs.recommended.rules,
+      "react-hooks/exhaustive-deps": "error",
+      "react-refresh/only-export-components": ["error", { allowConstantExport: true }],
+    },
+  },
+  prettier,
+]);