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function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

import { invariant } from '@react-dnd/invariant';
import { isPlainObject } from '../utils/js_utils';
import { getDecoratedComponent } from './utils';
var ALLOWED_SPEC_METHODS = ['canDrop', 'hover', 'drop'];

var TargetImpl = /*#__PURE__*/function () {
  function TargetImpl(spec, monitor, ref) {
    _classCallCheck(this, TargetImpl);

    this.props = null;
    this.spec = spec;
    this.monitor = monitor;
    this.ref = ref;
  }

  _createClass(TargetImpl, [{
    key: "receiveProps",
    value: function receiveProps(props) {
      this.props = props;
    }
  }, {
    key: "receiveMonitor",
    value: function receiveMonitor(monitor) {
      this.monitor = monitor;
    }
  }, {
    key: "canDrop",
    value: function canDrop() {
      if (!this.spec.canDrop) {
        return true;
      }

      return this.spec.canDrop(this.props, this.monitor);
    }
  }, {
    key: "hover",
    value: function hover() {
      if (!this.spec.hover || !this.props) {
        return;
      }

      this.spec.hover(this.props, this.monitor, getDecoratedComponent(this.ref));
    }
  }, {
    key: "drop",
    value: function drop() {
      if (!this.spec.drop) {
        return undefined;
      }

      var dropResult = this.spec.drop(this.props, this.monitor, this.ref.current);

      if (process.env.NODE_ENV !== 'production') {
        invariant(typeof dropResult === 'undefined' || isPlainObject(dropResult), 'drop() must either return undefined, or an object that represents the drop result. ' + 'Instead received %s. ' + 'Read more: http://react-dnd.github.io/react-dnd/docs/api/drop-target', dropResult);
      }

      return dropResult;
    }
  }]);

  return TargetImpl;
}();

export function createTargetFactory(spec) {
  Object.keys(spec).forEach(function (key) {
    invariant(ALLOWED_SPEC_METHODS.indexOf(key) > -1, 'Expected the drop target specification to only have ' + 'some of the following keys: %s. ' + 'Instead received a specification with an unexpected "%s" key. ' + 'Read more: http://react-dnd.github.io/react-dnd/docs/api/drop-target', ALLOWED_SPEC_METHODS.join(', '), key);
    invariant(typeof spec[key] === 'function', 'Expected %s in the drop target specification to be a function. ' + 'Instead received a specification with %s: %s. ' + 'Read more: http://react-dnd.github.io/react-dnd/docs/api/drop-target', key, key, spec[key]);
  });
  return function createTarget(monitor, ref) {
    return new TargetImpl(spec, monitor, ref);
  };
}