30 lines
898 B
JavaScript
30 lines
898 B
JavaScript
import { GraphQLError } from '../../error/GraphQLError';
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export function duplicateFragmentNameMessage(fragName) {
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return "There can be only one fragment named \"".concat(fragName, "\".");
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}
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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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export function UniqueFragmentNames(context) {
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var knownFragmentNames = Object.create(null);
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return {
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OperationDefinition: function OperationDefinition() {
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return false;
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},
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FragmentDefinition: function FragmentDefinition(node) {
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var fragmentName = node.name.value;
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if (knownFragmentNames[fragmentName]) {
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context.reportError(new GraphQLError(duplicateFragmentNameMessage(fragmentName), [knownFragmentNames[fragmentName], node.name]));
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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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