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

Fork of GraphQL.js

import { groupBy } from '../../jsutils/groupBy.js';
import { GraphQLError } from '../../error/GraphQLError.js';
/**
 * Unique argument names
 *
 * A GraphQL field or directive is only valid if all supplied arguments are
 * uniquely named.
 *
 * See https://spec.graphql.org/draft/#sec-Argument-Names
 */
export function UniqueArgumentNamesRule(context) {
    return {
        Field: checkArgUniqueness,
        Directive: checkArgUniqueness,
    };
    function checkArgUniqueness(parentNode) {
        var _a;
        // FIXME: https://github.com/graphql/graphql-js/issues/2203
        /* c8 ignore next */
        const argumentNodes = (_a = parentNode.arguments) !== null && _a !== void 0 ? _a : [];
        const seenArgs = groupBy(argumentNodes, arg => arg.name.value);
        for (const [argName, argNodes] of seenArgs) {
            if (argNodes.length > 1) {
                context.reportError(new GraphQLError(`There can be only one argument named "${argName}".`, {
                    nodes: argNodes.map(node => node.name),
                }));
            }
        }
    }
}