Update .eslintrc.js

Author: mtoensing

.eslintrc.js

@@ -1,11 +1,20 @@
 module.exports = {
-	extends: [ 'plugin:@wordpress/eslint-plugin/recommended' ],
-	rules: {
-		'import/no-unresolved': [
-			'error',
-			{
-				ignore: [ '^@wordpress/' ],
-			},
-		],
-	},
-};
+  extends: [ 'plugin:@wordpress/eslint-plugin/recommended' ],
+  rules: {
+    // WordPress provides these as externals
+    'import/no-unresolved': [
+      'error',
+      {
+        ignore: [ '^@wordpress/' ],
+      },
+    ],
+
+    // Do NOT require @wordpress/* to be installed
+    'import/no-extraneous-dependencies': [
+      'error',
+      {
+        optionalDependencies: [ '@wordpress/*' ],
+      },
+    ],
+  },
+};