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import { GraphQLError } from "../../error/GraphQLError.mjs";
/**
* Unique fragment names
*
* A GraphQL document is only valid if all defined fragments have unique names.
*/
export function UniqueFragmentNamesRule(context) {
var knownFragmentNames = Object.create(null);
return {
OperationDefinition: function OperationDefinition() {
return false;
},
FragmentDefinition: function FragmentDefinition(node) {
var fragmentName = node.name.value;
if (knownFragmentNames[fragmentName]) {
context.reportError(new GraphQLError("There can be only one fragment named \"".concat(fragmentName, "\"."), [knownFragmentNames[fragmentName], node.name]));
} else {
knownFragmentNames[fragmentName] = node.name;
}
return false;
}
};
}
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