| import { GraphQLError } from '../../error/GraphQLError.mjs'; |
| |
| /** |
| * Unique type names |
| * |
| * A GraphQL document is only valid if all defined types have unique names. |
| */ |
| export function UniqueTypeNamesRule(context) { |
| const knownTypeNames = Object.create(null); |
| const schema = context.getSchema(); |
| return { |
| ScalarTypeDefinition: checkTypeName, |
| ObjectTypeDefinition: checkTypeName, |
| InterfaceTypeDefinition: checkTypeName, |
| UnionTypeDefinition: checkTypeName, |
| EnumTypeDefinition: checkTypeName, |
| InputObjectTypeDefinition: checkTypeName, |
| }; |
| |
| function checkTypeName(node) { |
| const typeName = node.name.value; |
| |
| if (schema !== null && schema !== void 0 && schema.getType(typeName)) { |
| context.reportError( |
| new GraphQLError( |
| `Type "${typeName}" already exists in the schema. It cannot also be defined in this type definition.`, |
| { |
| nodes: node.name, |
| }, |
| ), |
| ); |
| return; |
| } |
| |
| if (knownTypeNames[typeName]) { |
| context.reportError( |
| new GraphQLError(`There can be only one type named "${typeName}".`, { |
| nodes: [knownTypeNames[typeName], node.name], |
| }), |
| ); |
| } else { |
| knownTypeNames[typeName] = node.name; |
| } |
| |
| return false; |
| } |
| } |