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/* @flow */
import { _Set as Set, isObject } from '../util/index'
import type { SimpleSet } from '../util/index'
import VNode from '../vdom/vnode'
const seenObjects = new Set()
/**
* Recursively traverse an object to evoke all converted
* getters, so that every nested property inside the object
* is collected as a "deep" dependency.
*/
export function traverse (val: any) {
_traverse(val, seenObjects)
seenObjects.clear()
}
function _traverse (val: any, seen: SimpleSet) {
let i, keys
const isA = Array.isArray(val)
if ((!isA && !isObject(val)) || Object.isFrozen(val) || val instanceof VNode) {
return
}
if (val.__ob__) {
const depId = val.__ob__.dep.id
if (seen.has(depId)) {
return
}
seen.add(depId)
}
if (isA) {
i = val.length
while (i--) _traverse(val[i], seen)
} else {
keys = Object.keys(val)
i = keys.length
while (i--) _traverse(val[keys[i]], seen)
}
}