chore: migrate findable-ui eslint to flat config (#926)

.storybook/main.ts

@@ -1,10 +1,10 @@
 import { defineMain } from "@storybook/nextjs-vite/node";
 
 export default defineMain({
-  framework: "@storybook/nextjs-vite",
-  stories: ["../src/**/*.mdx", "../src/**/*.stories.@(js|jsx|mjs|ts|tsx)"],
   core: {
     builder: "@storybook/builder-vite",
     disableTelemetry: true,
   },
+  framework: "@storybook/nextjs-vite",
+  stories: ["../src/**/*.mdx", "../src/**/*.stories.@(js|jsx|mjs|ts|tsx)"],
 });

eslint.config.mjs

@@ -0,0 +1,87 @@
+import { FlatCompat } from "@eslint/eslintrc";
+import js from "@eslint/js";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
+
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+  recommendedConfig: js.configs.recommended,
+});
+
+const config = [
+  {
+    ignores: ["**/node_modules/**", "**/out/**", "**/.next/**", "lib/**"],
+  },
+  ...compat.config({
+    extends: [
+      "eslint:recommended",
+      "plugin:@typescript-eslint/recommended",
+      "prettier",
+      "plugin:prettier/recommended",
+      "plugin:storybook/recommended",
+      "next",
+      "plugin:sonarjs/recommended",
+      "plugin:eslint-comments/recommended",
+    ],
+    parser: "@typescript-eslint/parser",
+    plugins: [
+      "@typescript-eslint",
+      "sonarjs",
+      "jsdoc",
+      "sort-destructure-keys",
+      "typescript-sort-keys",
+      "react-hooks",
+    ],
+    rules: {
+      "eslint-comments/require-description": "error",
+      "jsdoc/check-alignment": "error",
+      "jsdoc/check-param-names": "error",
+      "jsdoc/require-description": "error",
+      "jsdoc/require-hyphen-before-param-description": "error",
+      "jsdoc/require-param": "error",
+      "jsdoc/require-param-description": "error",
+      "jsdoc/require-param-name": "error",
+      "jsdoc/require-returns": "error",
+      "jsdoc/require-returns-description": "error",
+      "react-hooks/exhaustive-deps": "error",
+      "sort-destructure-keys/sort-destructure-keys": [
+        "error",
+        { caseSensitive: false },
+      ],
+      "sort-keys": [
+        "error",
+        "asc",
+        { caseSensitive: true, minKeys: 2, natural: false },
+      ],
+      "typescript-sort-keys/interface": [
+        "error",
+        "asc",
+        { caseSensitive: false },
+      ],
+      "typescript-sort-keys/string-enum": [
+        "error",
+        "asc",
+        { caseSensitive: false },
+      ],
+    },
+  }),
+  {
+    files: ["**/*.{ts,tsx,js,jsx,mjs,cjs}"],
+    ignores: ["**/*.styles.ts", "**/*.styles.tsx"],
+    rules: {
+      "@typescript-eslint/explicit-function-return-type": "error",
+    },
+  },
+  {
+    files: ["**/*.test.{ts,tsx}"],
+    rules: {
+      "@typescript-eslint/no-explicit-any": "off",
+      "sonarjs/no-duplicate-string": "off",
+    },
+  },
+];
+
+export default config;

package.json

@@ -4,7 +4,7 @@
   "description": "",
   "scripts": {
     "test": "node --experimental-vm-modules node_modules/jest/bin/jest.js",
-    "lint": "eslint .",
+    "lint": "ESLINT_USE_FLAT_CONFIG=true eslint .",
     "check-format": "prettier --check .",
     "storybook": "storybook dev -p 6006",
     "test-compile": "tsc --noEmit",
@@ -38,6 +38,8 @@
     "@commitlint/cli": "^20.2.0",
     "@commitlint/config-conventional": "^20.2.0",
     "@emotion/jest": "^11.14.2",
+    "@eslint/eslintrc": "^3.3.5",
+    "@eslint/js": "^8.57.1",
     "@next/eslint-plugin-next": "^15.5.13",
     "@storybook/nextjs-vite": "^10.3.3",
     "@testing-library/react": "^16.3.1",