graphql/validation/rules/NoUnusedFragmentsRule.mjs

import { GraphQLError } from "../../error/GraphQLError.mjs";

/**
 * No unused fragments
 *
 * A GraphQL document is only valid if all fragment definitions are spread
 * within operations, or spread within other fragments spread within operations.
 */
export function NoUnusedFragmentsRule(context) {
  var operationDefs = [];
  var fragmentDefs = [];
  return {
    OperationDefinition: function OperationDefinition(node) {
      operationDefs.push(node);
      return false;
    },
    FragmentDefinition: function FragmentDefinition(node) {
      fragmentDefs.push(node);
      return false;
    },
    Document: {
      leave: function leave() {
        var fragmentNameUsed = Object.create(null);

        for (var _i2 = 0; _i2 < operationDefs.length; _i2++) {
          var operation = operationDefs[_i2];

          for (var _i4 = 0, _context$getRecursive2 = context.getRecursivelyReferencedFragments(operation); _i4 < _context$getRecursive2.length; _i4++) {
            var fragment = _context$getRecursive2[_i4];
            fragmentNameUsed[fragment.name.value] = true;
          }
        }

        for (var _i6 = 0; _i6 < fragmentDefs.length; _i6++) {
          var fragmentDef = fragmentDefs[_i6];
          var fragName = fragmentDef.name.value;

          if (fragmentNameUsed[fragName] !== true) {
            context.reportError(new GraphQLError("Fragment \"".concat(fragName, "\" is never used."), fragmentDef));
          }
        }
      }
    }
  };
}