Upgrade ESLint to 9.39.1 and add disableProblemticEslintJsRules

- Add disableProblemticEslintJsRules export and include in config - Bump
eslint to 9.39.1 across packages and update lockfiles

Author: Rel1cx

.pkgs/configs/eslint.d.ts

@@ -8,3 +8,7 @@ export declare const GLOB_SCRIPTS: string[];
 export declare const GLOB_IGNORES: readonly ["**/node_modules", "**/dist", "**/package-lock.json", "**/yarn.lock", "**/pnpm-lock.yaml", "**/bun.lockb", "**/output", "**/coverage", "**/temp", "**/.temp", "**/tmp", "**/.tmp", "**/.history", "**/.vitepress/cache", "**/.nuxt", "**/.next", "**/.vercel", "**/.changeset", "**/.idea", "**/.cache", "**/.output", "**/.vite-inspect", "**/.yarn", "**/storybook-static", "**/.eslint-config-inspector", "**/playwright-report", "**/.astro", "**/.vinxi", "**/app.config.timestamp_*.js", "**/.tanstack", "**/.nitro", "**/CHANGELOG*.md", "**/*.min.*", "**/LICENSE*", "**/__snapshots__", "**/auto-import?(s).d.ts", "**/components.d.ts", "**/vite.config.ts.*.mjs", "**/*.gen.*", "!.storybook"];
 export declare const strictTypeChecked: Linter.Config[];
 export declare const disableTypeChecked: Linter.Config[];
+/**
+ * Common ESLint JS rules to disable that are problematic when using TypeScript.
+ */
+export declare const disableProblemticEslintJsRules: Linter.Config;

.pkgs/configs/eslint.js

@@ -104,8 +104,6 @@ export const strictTypeChecked = defineConfig([
             "no-else-return": "error",
             "no-fallthrough": ["error", { commentPattern: ".*intentional fallthrough.*" }],
             "no-implicit-coercion": ["error", { allow: ["!!"] }],
-            "no-mixed-operators": "warn",
-            "no-undef": "off",
             "prefer-object-has-own": "error",
             "no-restricted-syntax": [
                 "error",
@@ -214,3 +212,13 @@ export const disableTypeChecked = defineConfig([
         },
     },
 ]);
+/**
+ * Common ESLint JS rules to disable that are problematic when using TypeScript.
+ */
+export const disableProblemticEslintJsRules = {
+    rules: {
+        // handled by TypeScript
+        "no-dupe-args": "off",
+        "no-unused-vars": "off",
+    },
+};

.pkgs/configs/eslint.ts

@@ -114,8 +114,6 @@ export const strictTypeChecked: Linter.Config[] = defineConfig([
       "no-else-return": "error",
       "no-fallthrough": ["error", { commentPattern: ".*intentional fallthrough.*" }],
       "no-implicit-coercion": ["error", { allow: ["!!"] }],
-      "no-mixed-operators": "warn",
-      "no-undef": "off",
       "prefer-object-has-own": "error",
 
       "no-restricted-syntax": [
@@ -231,3 +229,13 @@ export const disableTypeChecked: Linter.Config[] = defineConfig([
     },
   },
 ]);
+
+/**
+ * Common ESLint JS rules to disable that are problematic when using TypeScript.
+ */
+export const disableProblemticEslintJsRules: Linter.Config = {
+  rules: {
+    "no-dupe-args": "off",
+    "no-unused-vars": "off",
+  },
+};

apps/website/package.json

@@ -46,7 +46,7 @@
     "@types/react": "^19.2.2",
     "@types/react-dom": "^19.2.2",
     "dedent": "^1.7.0",
-    "eslint": "^9.38.0",
+    "eslint": "^9.39.1",
     "eslint-plugin-fast-import": "^1.5.3",
     "eslint-plugin-react-hooks": "^7.0.1",
     "eslint-plugin-react-refresh": "^0.4.24",

eslint.config.ts

@@ -7,6 +7,7 @@ import {
   GLOB_SCRIPTS,
   GLOB_TESTS,
   GLOB_TS,
+  disableProblemticEslintJsRules,
   disableTypeChecked,
   strictTypeChecked,
 } from "@local/configs/eslint";
@@ -99,4 +100,5 @@ export default defineConfig([
       "local/avoid-multiline-template-expression": "off",
     },
   },
+  disableProblemticEslintJsRules,
 ]);

examples/next/package.json

@@ -26,7 +26,7 @@
     "@types/node": "^24.10.0",
     "@types/react": "^19.2.2",
     "@types/react-dom": "^19.2.2",
-    "eslint": "^9.38.0",
+    "eslint": "^9.39.1",
     "eslint-plugin-react-hooks": "^7.0.1",
     "eslint-plugin-react-refresh": "^0.4.24",
     "typescript": "^5.9.3",

examples/react-dom-js/package.json

@@ -21,7 +21,7 @@
     "@types/react": "^19.2.2",
     "@types/react-dom": "^19.2.2",
     "@vitejs/plugin-react": "^5.1.0",
-    "eslint": "^9.38.0",
+    "eslint": "^9.39.1",
     "eslint-plugin-react-hooks": "^7.0.1",
     "eslint-plugin-react-refresh": "^0.4.24",
     "globals": "^16.5.0",

examples/react-dom/package.json

@@ -24,7 +24,7 @@
     "@types/react": "^19.2.2",
     "@types/react-dom": "^19.2.2",
     "@vitejs/plugin-react": "^5.1.0",
-    "eslint": "^9.38.0",
+    "eslint": "^9.39.1",
     "eslint-plugin-react-hooks": "^7.0.1",
     "eslint-plugin-react-refresh": "^0.4.24",
     "typescript": "^5.9.3",

examples/with-babel-eslint-parser/eslint.config.js

@@ -13,6 +13,14 @@ import globals from "globals";
 import JSCONFIG_APP from "./jsconfig.app.json" with { type: "json" };
 import JSCONFIG_NODE from "./jsconfig.node.json" with { type: "json" };
 
+const disableProblemticEslintJsRules = {
+  rules: {
+    // handled by TypeScript
+    "no-dupe-args": "off",
+    "no-unused-vars": "off",
+  },
+};
+
 export default defineConfig([
   // base configuration for browser environment source files
   {
@@ -71,4 +79,5 @@ export default defineConfig([
       eslintPluginReactHooks.configs.flat["recommended-latest"] ?? [],
     ],
   },
+  disableProblemticEslintJsRules,
 ]);

examples/with-babel-eslint-parser/package.json

@@ -26,7 +26,7 @@
     "@types/react": "^19.2.2",
     "@types/react-dom": "^19.2.2",
     "@vitejs/plugin-react": "^5.1.0",
-    "eslint": "^9.38.0",
+    "eslint": "^9.39.1",
     "eslint-plugin-react-debug": "workspace:*",
     "eslint-plugin-react-dom": "workspace:*",
     "eslint-plugin-react-hooks": "^7.0.1",