Ensure property values are always overridden by extendors/behaviors

Polymer · Nov 14, 2018 · 2b35a74 · 2b35a74
1 parent 50ad018
commit 2b35a74
Showing 1 changed file with 6 additions and 3 deletions.
diff --git a/lib/legacy/class.js b/lib/legacy/class.js
@@ -153,16 +153,19 @@ function flattenBehaviors(behaviors, list, exclude) {
 }
 
 function mergePropertyInfo(a, b) {
+  if ('value' in b) {
+    a.value = b.value;
+  // ensure property value is always overridden.
+  } else if ('value' in a) {
+    delete a.value;
+  }
   if (typeof b === 'function') {
     a.type = b;
     return;
   }
   if ('type' in b) {
     a.type = b.type;
   }
-  if ('value' in b) {
-    a.value = b.value;
-  }
   // readOnly: cannot become false and takes on `computed` value
   a.readOnly = a.readOnly || Boolean(a.computed) || b.readOnly || Boolean(b.computed);
   // computed: first in wins