fix(vuex): "_isBuffer" is not defined on the instance warning from Vue,

closes #955

src/backend/clone.js

@@ -24,14 +24,21 @@ try {
  NativePromise = function () {}
 }
 
-export default function clone (parent, { circular = true, depth = Infinity, prototype, includeNonEnumerable } = {}) {
+export default function clone (parent, {
+ circular = true,
+ depth = Infinity,
+ prototype,
+ includeNonEnumerable
+} = {}) {
  // maintain two arrays for circular references, where corresponding parents
  // and children have the same index
  var allParents = []
  var allChildren = []
 
  var useBuffer = typeof Buffer !== 'undefined' && typeof Buffer.isBuffer === 'function'
 
+ const isBuffer = typeof window !== 'undefined' ? browserIsBuffer : Buffer.isBuffer
+
  // recurse this function so we don't reset allParents and allChildren
  function _clone (parent, depth) {
  // cloning null always returns null
@@ -64,7 +71,7 @@ export default function clone (parent, { circular = true, depth = Infinity, prot
  if (parent.lastIndex) child.lastIndex = parent.lastIndex
  } else if (clone.__isDate(parent)) {
  child = new Date(parent.getTime())
- } else if (useBuffer && Buffer.isBuffer(parent)) {
+ } else if (useBuffer && isBuffer(parent)) {
  if (Buffer.from) {
  // Node.js >= 5.10.0
  child = Buffer.from(parent)
@@ -191,3 +198,7 @@ clone.__getRegExpFlags = __getRegExpFlags
 function _instanceof (obj, type) {
  return type != null && obj instanceof type
 }
+
+function browserIsBuffer (b) {
+ return !!(b != null && '_isBuffer' in b && b._isBuffer)
+}