default eslint to v9

Author: devjiwonchoi

.eslintrc.cli.json

@@ -21,5 +21,20 @@
         "@typescript-eslint/no-floating-promises": "off"
       }
     }
-  ]
+  ],
+  "rules": {
+    // TODO(jiwon): handle them correctly when fully migrating to ESLint v9
+    // below errored when upgraded to ESLint v9
+    "no-unused-vars": "off",
+    "@typescript-eslint/no-unused-vars": "off",
+    "@typescript-eslint/no-unsafe-function-type": "off",
+    "@typescript-eslint/no-require-imports": "off",
+    "@typescript-eslint/no-empty-object-type": "off",
+    "@typescript-eslint/no-wrapper-object-types": "off",
+    "react-hooks/rules-of-hooks": "off",
+    "@typescript-eslint/no-unsafe-assignment": "off",
+    "@typescript-eslint/no-unsafe-member-access": "off",
+    "@typescript-eslint/no-unsafe-call": "off",
+    "@typescript-eslint/no-unsafe-return": "off"
+  }
 }

package.json

@@ -34,7 +34,7 @@
     "git-clean": "git clean -d -x -e node_modules -e packages -f",
     "typescript": "tsc --noEmit",
     "lint-typescript": "turbo run typescript",
-    "lint-eslint": "eslint . --ext js,jsx,ts,tsx --config .eslintrc.cli.json --no-eslintrc",
+    "lint-eslint": "cross-env ESLINT_USE_FLAT_CONFIG=false eslint . --ext js,jsx,ts,tsx --config .eslintrc.cli.json --no-eslintrc",
     "lint-ast-grep": "ast-grep scan",
     "lint-no-typescript": "run-p prettier-check lint-eslint lint-language",
     "types-and-precompiled": "run-p lint-typescript check-precompiled validate-externals-doc",
@@ -121,8 +121,8 @@
     "@types/relay-runtime": "14.1.13",
     "@types/string-hash": "1.1.1",
     "@types/trusted-types": "2.0.3",
-    "@typescript-eslint/eslint-plugin": "7.16.0",
-    "@typescript-eslint/parser": "7.16.0",
+    "@typescript-eslint/eslint-plugin": "8.0.0",
+    "@typescript-eslint/parser": "8.0.0",
     "@vercel/devlow-bench": "workspace:*",
     "@vercel/fetch": "6.1.1",
     "@vercel/og": "0.6.3",
@@ -144,16 +144,16 @@
     "dd-trace": "4.12.0",
     "es5-ext": "0.10.53",
     "escape-string-regexp": "2.0.0",
-    "eslint": "8.56.0",
+    "eslint": "9.12.0",
     "eslint-config-next": "workspace:*",
     "eslint-formatter-codeframe": "7.32.1",
     "eslint-plugin-eslint-plugin": "5.2.1",
-    "eslint-plugin-import": "2.29.1",
+    "eslint-plugin-import": "2.31.0",
     "eslint-plugin-jest": "27.6.3",
     "eslint-plugin-jsdoc": "48.0.4",
-    "eslint-plugin-react": "7.33.2",
-    "eslint-plugin-react-hooks": "4.6.0",
-    "eslint-v9": "npm:eslint@^9.0.0",
+    "eslint-plugin-react": "7.35.0",
+    "eslint-plugin-react-hooks": "5.0.0",
+    "eslint-v8": "npm:eslint@^8.56.0",
     "event-stream": "4.0.1",
     "execa": "2.0.3",
     "expect-type": "0.14.2",
@@ -275,8 +275,7 @@
       "react": "19.0.0-rc-70fb1363-20241010",
       "react-dom": "19.0.0-rc-70fb1363-20241010",
       "react-is": "19.0.0-rc-70fb1363-20241010",
-      "scheduler": "0.25.0-rc-70fb1363-20241010",
-      "eslint": "8.56.0"
+      "scheduler": "0.25.0-rc-70fb1363-20241010"
     },
     "patchedDependencies": {
       "[email protected]": "patches/[email protected]"