Edit File: traverse.js
/* @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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