VueUtils.ts

export function def(obj: Object, key: string, val: any, enumerable ? : boolean) {
    Object.defineProperty(obj, key, {
        value: val,
        enumerable: !!enumerable,
        writable: true,
        configurable: true
    })
}

// can we use __proto__?
export const hasProto = '__proto__' in {};

export function isObject(obj): boolean {
    return obj !== null && typeof obj === 'object'
}

const hasOwnProperty = Object.prototype.hasOwnProperty
export function hasOwn(obj: Object | Array < any > , key: string): boolean {
    return hasOwnProperty.call(obj, key)
}

const _toString = Object.prototype.toString
export function isPlainObject (obj: any): boolean {
    return _toString.call(obj) === '[object Object]'
}

export function remove (arr: Array<any>, item: any): Array<any> | void {
    if (arr.length) {
      const index = arr.indexOf(item)
      if (index > -1) {
        return arr.splice(index, 1)
      }
    }
}

export const unicodeRegExp = /a-zA-Z\u00B7\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u037D\u037F-\u1FFF\u200C-\u200D\u203F-\u2040\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD/

const bailRE = new RegExp(`[^${unicodeRegExp.source}.$_\\d]`)
export function parsePath (path: string): any {
  if (bailRE.test(path)) {
    return
  }
  const segments = path.split('.')
  return function (obj) {
    for (let i = 0; i < segments.length; i++) {
      if (!obj) return
      obj = obj[segments[i]]
    }
    return obj
  }
}

export function parsePathFromArray(segments: Array <any>) {
  return function (obj) {
    for (let i = 0; i < segments.length; i++) {
      if (!obj) return
      obj = obj[segments[i]]
    }
    return obj
  }
}

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: Set<any>) {
  let i, keys
  const isA = Array.isArray(val)
  if ((!isA && !isObject(val)) || Object.isFrozen(val)) {
    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)
  }
}