feat: auto JS fallback

packages/vue/index.js

@@ -1,3 +1,10 @@
+const { isPackageExists } = require('local-pkg')
+
+const TS = isPackageExists('typescript')
+
+if (!TS)
+  console.warn('[@antfu/eslint-config] TypeScript is not installed, fallback to JS only.')
+
 module.exports = {
   overrides: [
     {
@@ -9,13 +16,17 @@ module.exports = {
       rules: {
         'no-unused-vars': 'off',
         'no-undef': 'off',
-        '@typescript-eslint/no-unused-vars': 'off',
+        ...(TS
+          ? { '@typescript-eslint/no-unused-vars': 'off' }
+          : null),
       },
     },
   ],
   extends: [
     'plugin:vue/vue3-recommended',
-    '@antfu/eslint-config-ts',
+    TS
+      ? '@antfu/eslint-config-ts'
+      : '@antfu/eslint-config-basic',
   ],
   rules: {
     'vue/max-attributes-per-line': 'off',

packages/vue/package.json

@@ -16,9 +16,11 @@
   },
   "dependencies": {
     "@antfu/eslint-config-ts": "workspace:*",
+    "@antfu/eslint-config-basic": "workspace:*",
     "eslint-plugin-vue": "^9.4.0"
   },
   "devDependencies": {
-    "eslint": "^8.23.0"
+    "eslint": "^8.23.0",
+    "local-pkg": "^0.4.2"
   }
 }

pnpm-lock.yaml

@@ -131,14 +131,18 @@ importers:
 
   packages/vue:
     specifiers:
+      '@antfu/eslint-config-basic': workspace:*
       '@antfu/eslint-config-ts': workspace:*
       eslint: ^8.23.0
       eslint-plugin-vue: ^9.4.0
+      local-pkg: ^0.4.2
     dependencies:
+      '@antfu/eslint-config-basic': link:../basic
       '@antfu/eslint-config-ts': link:../typescript
       eslint-plugin-vue: 9.4.0_eslint@8.23.0
     devDependencies:
       eslint: 8.23.0
+      local-pkg: 0.4.2
 
 packages: