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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)
- }
- }
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