chore: change eslint config to Flat Config

eslint.config.mjs

@@ -0,0 +1,57 @@
+import presetsNodeTypescriptPrettier from "@cybozu/eslint-config/flat/presets/node-typescript-prettier.js";
+import websiteConfig from "./website/eslint.config.mjs";
+import featuresConfig from "./features/eslint.config.mjs";
+
+export default [
+  {
+    ignores: [
+      "**/lib",
+      "**/dist",
+      "**/coverage",
+      "**/allure-report",
+      "**/allure-results",
+      // website package
+      "website/.docusaurus",
+      "website/build",
+      // Auto generated file
+      "website/contributors.json",
+    ],
+  },
+  ...presetsNodeTypescriptPrettier,
+  {
+    rules: {
+      curly: ["error", "all"],
+      "func-style": ["error"],
+
+      "@typescript-eslint/no-empty-object-type": "off",
+
+      "@typescript-eslint/no-wrapper-object-types": "off",
+
+      "@typescript-eslint/consistent-type-imports": [
+        "error",
+        {
+          prefer: "type-imports",
+        },
+      ],
+
+      "@typescript-eslint/no-unused-vars": [
+        "warn",
+        {
+          argsIgnorePattern: "^_",
+          varsIgnorePattern: "^_",
+          caughtErrorsIgnorePattern: "^_",
+          destructuredArrayIgnorePattern: "^_",
+        },
+      ],
+      "n/no-missing-import": "off",
+    },
+  },
+  ...websiteConfig.map((configObject) => ({
+    files: ["website/**/*.{js,cjs,mjs,ts,cts,mts,jsx,tsx}"],
+    ...configObject,
+  })),
+  ...featuresConfig.map((configObject) => ({
+    files: ["features/**/*.{js,cjs,mjs,ts,cts,mts,jsx,tsx}"],
+    ...configObject,
+  })),
+];

features/eslint.config.mjs

@@ -0,0 +1,21 @@
+export default [
+  {
+    rules: {
+      "new-cap": [
+        "warn",
+        {
+          capIsNewExceptions: [
+            "Given",
+            "When",
+            "Then",
+            "BeforeAll",
+            "Before",
+            "AfterAll",
+            "After",
+          ],
+        },
+      ],
+      "no-invalid-this": "off",
+    },
+  },
+];

package.json

@@ -30,7 +30,7 @@
     "test:e2e:dev": "pnpm test:e2e --fail-fast",
     "test:e2e:ci": "pnpm clean:test && node ./scripts/run-e2e-in-parallel.mjs",
     "lint": "run-p -l lint:*",
-    "lint:eslint": "eslint --ext .js,.mjs,.cjs,.jsx,.ts,.mts,.cts,.tsx ./ --max-warnings 0 --cache --cache-location ./node_modules/.cache/eslint/",
+    "lint:eslint": "eslint ./ --max-warnings 0 --cache --cache-location ./node_modules/.cache/eslint/",
     "lint:prettier": "prettier --check '**/*.{json,md,yml,yaml}' --cache",
     "fix": "run-p fix:*",
     "fix:lint": "run-s 'lint:eslint --fix'",
@@ -69,7 +69,7 @@
     "@babel/preset-env": "^7.25.7",
     "@babel/preset-typescript": "^7.25.7",
     "@cucumber/cucumber": "^10.9.0",
-    "@cybozu/eslint-config": "^23.0.0",
+    "@cybozu/eslint-config": "^24.0.0-beta.0",
     "@cybozu/license-manager": "^1.2.1",
     "@octokit/rest": "^20.1.1",
     "@types/jest": "^29.5.13",