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"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.UniqueFragmentNamesRule = UniqueFragmentNamesRule;

var _GraphQLError = require("../../error/GraphQLError.js");

/**
 * Unique fragment names
 *
 * A GraphQL document is only valid if all defined fragments have unique names.
 */
function UniqueFragmentNamesRule(context) {
  var knownFragmentNames = Object.create(null);
  return {
    OperationDefinition: function OperationDefinition() {
      return false;
    },
    FragmentDefinition: function FragmentDefinition(node) {
      var fragmentName = node.name.value;

      if (knownFragmentNames[fragmentName]) {
        context.reportError(new _GraphQLError.GraphQLError("There can be only one fragment named \"".concat(fragmentName, "\"."), [knownFragmentNames[fragmentName], node.name]));
      } else {
        knownFragmentNames[fragmentName] = node.name;
      }

      return false;
    }
  };
}