@graphql-tools/graphql/esm/validation/rules/UniqueOperationNamesRule.js

Fork of GraphQL.js

import { GraphQLError } from '../../error/GraphQLError.js';
/**
 * Unique operation names
 *
 * A GraphQL document is only valid if all defined operations have unique names.
 *
 * See https://spec.graphql.org/draft/#sec-Operation-Name-Uniqueness
 */
export function UniqueOperationNamesRule(context) {
    const knownOperationNames = Object.create(null);
    return {
        OperationDefinition(node) {
            const operationName = node.name;
            if (operationName) {
                if (knownOperationNames[operationName.value]) {
                    context.reportError(new GraphQLError(`There can be only one operation named "${operationName.value}".`, {
                        nodes: [knownOperationNames[operationName.value], operationName],
                    }));
                }
                else {
                    knownOperationNames[operationName.value] = operationName;
                }
            }
            return false;
        },
        FragmentDefinition: () => false,
    };
}