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39 lines
1.0 KiB
39 lines
1.0 KiB
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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