graphql/validation/rules/UniqueOperationNamesRule.mjs

A Query Language and Runtime which can target any service.

import { GraphQLError } from "../../error/GraphQLError.mjs";
export function UniqueOperationNamesRule(context) {
    const knownOperationNames = new Map();
    return {
        OperationDefinition(node) {
            const operationName = node.name;
            if (operationName != null) {
                const knownOperationName = knownOperationNames.get(operationName.value);
                if (knownOperationName != null) {
                    context.reportError(new GraphQLError(`There can be only one operation named "${operationName.value}".`, { nodes: [knownOperationName, operationName] }));
                }
                else {
                    knownOperationNames.set(operationName.value, operationName);
                }
            }
            return false;
        },
        FragmentDefinition: () => false,
    };
}
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