Function resolveMergedOptions

packages/runtime-core/src/componentOptions.ts:927–967

(
  instance: ComponentInternalInstance,
)

 * instances.
 */
export function resolveMergedOptions(
  instance: ComponentInternalInstance,
): MergedComponentOptions {
  const base = instance.type as ComponentOptions
  const { mixins, extends: extendsOptions } = base
  const {
    mixins: globalMixins,
    optionsCache: cache,
    config: { optionMergeStrategies },
  } = instance.appContext
  const cached = cache.get(base)

  let resolved: MergedComponentOptions

  if (cached) {
    resolved = cached
  } else if (!globalMixins.length && !mixins && !extendsOptions) {
    if (
      __COMPAT__ &&
      isCompatEnabled(DeprecationTypes.PRIVATE_APIS, instance)
    ) {
      resolved = extend({}, base) as MergedComponentOptions
      resolved.parent = instance.parent && instance.parent.proxy
      resolved.propsData = instance.vnode.props
    } else {
      resolved = base as MergedComponentOptions
    }
  } else {
    resolved = {}
    if (globalMixins.length) {
      globalMixins.forEach(m =>
        mergeOptions(resolved, m, optionMergeStrategies, true),
      )
    }
    mergeOptions(resolved, base, optionMergeStrategies)
  }
  if (isObject(base)) {
    cache.set(base, resolved)
  }
  return resolved
}

export function mergeOptions(
  to: any,