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39 lines
1.2 KiB
TypeScript
39 lines
1.2 KiB
TypeScript
// Loaded from https://deno.land/x/graphql_deno@v15.0.0/lib/validation/rules/UniqueTypeNamesRule.js
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import { GraphQLError } from '../../error/GraphQLError.js';
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/**
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* Unique type names
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*
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* A GraphQL document is only valid if all defined types have unique names.
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*/
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export function UniqueTypeNamesRule(context) {
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const knownTypeNames = Object.create(null);
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const schema = context.getSchema();
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return {
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ScalarTypeDefinition: checkTypeName,
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ObjectTypeDefinition: checkTypeName,
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InterfaceTypeDefinition: checkTypeName,
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UnionTypeDefinition: checkTypeName,
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EnumTypeDefinition: checkTypeName,
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InputObjectTypeDefinition: checkTypeName
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};
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function checkTypeName(node) {
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const typeName = node.name.value;
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if (schema?.getType(typeName)) {
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context.reportError(new GraphQLError(`Type "${typeName}" already exists in the schema. It cannot also be defined in this type definition.`, node.name));
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return;
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}
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if (knownTypeNames[typeName]) {
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context.reportError(new GraphQLError(`There can be only one type named "${typeName}".`, [knownTypeNames[typeName], node.name]));
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} else {
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knownTypeNames[typeName] = node.name;
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}
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return false;
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}
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} |