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import cloneDeep from './clone-deep'
import looseEqual from './loose-equal'
import { hasOwnProperty, keys } from './object'

const isEmpty = value => !value || keys(value).length === 0

export const makePropWatcher = propName => ({
  handler(newValue, oldValue) {
    if (looseEqual(newValue, oldValue)) {
      return
    }
    if (isEmpty(newValue) || isEmpty(oldValue)) {
      this[propName] = cloneDeep(newValue)
      return
    }
    for (const key in oldValue) {
      if (!hasOwnProperty(newValue, key)) {
        this.$delete(this.$data[propName], key)
      }
    }
    for (const key in newValue) {
      this.$set(this.$data[propName], key, newValue[key])
    }
  }
})

export const makePropCacheMixin = (propName, proxyPropName) => ({
  data() {
    return { [proxyPropName]: cloneDeep(this[propName]) }
  },
  watch: {
    // Work around unwanted re-renders: https://github.com/vuejs/vue/issues/10115
    [propName]: makePropWatcher(proxyPropName)
  }
})

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