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34 lines
883 B
34 lines
883 B
import { GraphQLError } from '../../error/GraphQLError.mjs'; |
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/** |
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* Unique fragment names |
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* |
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* A GraphQL document is only valid if all defined fragments have unique names. |
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* |
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* See https://spec.graphql.org/draft/#sec-Fragment-Name-Uniqueness |
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*/ |
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export function UniqueFragmentNamesRule(context) { |
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const knownFragmentNames = Object.create(null); |
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return { |
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OperationDefinition: () => false, |
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FragmentDefinition(node) { |
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const fragmentName = node.name.value; |
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if (knownFragmentNames[fragmentName]) { |
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context.reportError( |
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new GraphQLError( |
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`There can be only one fragment named "${fragmentName}".`, |
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{ |
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nodes: [knownFragmentNames[fragmentName], node.name], |
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}, |
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), |
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); |
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} else { |
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knownFragmentNames[fragmentName] = node.name; |
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} |
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return false; |
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}, |
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}; |
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}
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