avoid traversing frozen objects in deep watch

9 years ago · 1d02463ced
1 changed files with 1 additions and 1 deletions
--- a/src/core/observer/watcher.js
+++ b/src/core/observer/watcher.js
@ -264,7 +264,7 @@ function traverse (val: any, seen?: Set) {
  }
  const isA = Array.isArray(val)
  const isO = isObject(val)
-  if (isA || isO) {
+  if ((isA || isO) && Object.isExtensible(val)) {
    if (val.__ob__) {
      const depId = val.__ob__.dep.id
      if (seen.has(depId)) {