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import { concat } from './array';
import { identity } from './identity';
import { isFunction } from './inspect'; // Note for functional components:
// In functional components, `slots` is a function so it must be called
// first before passing to the below methods. `scopedSlots` is always an
// object and may be undefined (for Vue < 2.6.x)

/**
 * Returns true if either scoped or unscoped named slot exists
 *
 * @param {String, Array} name or name[]
 * @param {Object} scopedSlots
 * @param {Object} slots
 * @returns {Array|undefined} VNodes
 */

export var hasNormalizedSlot = function hasNormalizedSlot(names) {
  var $scopedSlots = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
  var $slots = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
  // Ensure names is an array
  names = concat(names).filter(identity); // Returns true if the either a $scopedSlot or $slot exists with the specified name

  return names.some(function (name) {
    return $scopedSlots[name] || $slots[name];
  });
};
/**
 * Returns VNodes for named slot either scoped or unscoped
 *
 * @param {String, Array} name or name[]
 * @param {String} scope
 * @param {Object} scopedSlots
 * @param {Object} slots
 * @returns {Array|undefined} VNodes
 */

export var normalizeSlot = function normalizeSlot(names) {
  var scope = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
  var $scopedSlots = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};
  var $slots = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : {};
  // Ensure names is an array
  names = concat(names).filter(identity);
  var slot;

  for (var i = 0; i < names.length && !slot; i++) {
    var name = names[i];
    slot = $scopedSlots[name] || $slots[name];
  } // Note: in Vue 2.6.x, all named slots are also scoped slots


  return isFunction(slot) ? slot(scope) : slot;
};