diff --git a/src/constants.js b/src/constants.js
index fb81dee..31612cc 100644
--- a/src/constants.js
+++ b/src/constants.js
@@ -78,6 +78,26 @@ function getType(v) {
         ? { type: Array, default: v }
         : { type: Object, default: v }
 
+    case 'string':
+      let type = String
+      let attribute = true
+      if (v.includes('!')) {
+        v = v.split('!')
+        let _t = v.shift()
+        if (_t === 'str') {
+          v = v.join('!')
+        } else if (_t === 'num') {
+          type = Number
+          v = +v.shift() || 0
+        } else if (_t === 'bool') {
+          type = Boolean
+          v = v.shift()
+          v = v !== 'false' && v !== ''
+        }
+        attribute = false
+      }
+      return { type, default: v, attribute }
+
     default:
       return { type: String, default: v + '' }
   }