diff --git a/index.ts b/index.ts
index 02c9e49b..f56e8705 100755
--- a/index.ts
+++ b/index.ts
@@ -78,6 +78,7 @@ async function init() {
       'with-tests': ['tests'],
       router: ['vue-router']
     },
+    string: ['_'],
     // all arguments are treated as booleans
     boolean: true
   })