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