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/* @flow */

import { extend, warn, isObject } from 'core/util/index'

/**
 * Runtime helper for rendering <slot>
 */
export function renderSlot (
  name: string,
  fallbackRender: ?((() => Array<VNode>) | Array<VNode>),
  props: ?Object,
  bindObject: ?Object
): ?Array<VNode> {
  const scopedSlotFn = this.$scopedSlots[name]
  let nodes
  if (scopedSlotFn) {
    // scoped slot
    props = props || {}
    if (bindObject) {
      if (process.env.NODE_ENV !== 'production' && !isObject(bindObject)) {
        warn('slot v-bind without argument expects an Object', this)
      }
      props = extend(extend({}, bindObject), props)
    }
    nodes =
      scopedSlotFn(props) ||
      (typeof fallbackRender === 'function' ? fallbackRender() : fallbackRender)
  } else {
    nodes =
      this.$slots[name] ||
      (typeof fallbackRender === 'function' ? fallbackRender() : fallbackRender)
  }

  const target = props && props.slot
  if (target) {
    return this.$createElement('template', { slot: target }, nodes)
  } else {
    return nodes
  }
}