avoid traversing frozen objects in deep watch

yyx990803 · yyx990803 · commit 1d02463ced3e · 2016-06-26T14:49:33.000-04:00
diff --git 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)) {

Original file line number	Diff line number	Diff line change
`@@ -264,7 +264,7 @@ function traverse (val: any, seen?: Set) {`
`264`	`264`	`}`
`265`	`265`	`const isA = Array.isArray(val)`
`266`	`266`	`const isO = isObject(val)`
`267`		`- if (isA \|\| isO) {`
	`267`	`+ if ((isA \|\| isO) && Object.isExtensible(val)) {`
`268`	`268`	`if (val.__ob__) {`
`269`	`269`	`const depId = val.__ob__.dep.id`
`270`	`270`	`if (seen.has(depId)) {`