avoid traversing frozen objects in deep watch (close vuejs#3147)

yyx990803 · yyx990803 · commit f3e2a12e5f38 · 2016-06-26T14:50:21.000-04:00
diff --git a/src/watcher.js b/src/watcher.js
@@ -343,7 +343,7 @@ function traverse (val, seen) {
   }
   const isA = isArray(val)
   const isO = isObject(val)
-  if (isA || isO) {
+  if ((isA || isO) && Object.isExtensible(val)) {
     if (val.__ob__) {
       var depId = val.__ob__.dep.id
       if (seen.has(depId)) {

Original file line number	Diff line number	Diff line change
`@@ -343,7 +343,7 @@ function traverse (val, seen) {`
`343`	`343`	`}`
`344`	`344`	`const isA = isArray(val)`
`345`	`345`	`const isO = isObject(val)`
`346`		`- if (isA \|\| isO) {`
	`346`	`+ if ((isA \|\| isO) && Object.isExtensible(val)) {`
`347`	`347`	`if (val.__ob__) {`
`348`	`348`	`var depId = val.__ob__.dep.id`
`349`	`349`	`if (seen.has(depId)) {`