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function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; }

function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }

function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

import { invariant } from '@react-dnd/invariant';
import { DROP } from './types';
import { isObject } from '../../utils/js_utils';
export function createDrop(manager) {
  return function drop() {
    var options = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
    var monitor = manager.getMonitor();
    var registry = manager.getRegistry();
    verifyInvariants(monitor);
    var targetIds = getDroppableTargets(monitor); // Multiple actions are dispatched here, which is why this doesn't return an action

    targetIds.forEach(function (targetId, index) {
      var dropResult = determineDropResult(targetId, index, registry, monitor);
      var action = {
        type: DROP,
        payload: {
          dropResult: _objectSpread(_objectSpread({}, options), dropResult)
        }
      };
      manager.dispatch(action);
    });
  };
}

function verifyInvariants(monitor) {
  invariant(monitor.isDragging(), 'Cannot call drop while not dragging.');
  invariant(!monitor.didDrop(), 'Cannot call drop twice during one drag operation.');
}

function determineDropResult(targetId, index, registry, monitor) {
  var target = registry.getTarget(targetId);
  var dropResult = target ? target.drop(monitor, targetId) : undefined;
  verifyDropResultType(dropResult);

  if (typeof dropResult === 'undefined') {
    dropResult = index === 0 ? {} : monitor.getDropResult();
  }

  return dropResult;
}

function verifyDropResultType(dropResult) {
  invariant(typeof dropResult === 'undefined' || isObject(dropResult), 'Drop result must either be an object or undefined.');
}

function getDroppableTargets(monitor) {
  var targetIds = monitor.getTargetIds().filter(monitor.canDropOnTarget, monitor);
  targetIds.reverse();
  return targetIds;
}