graphql/validation/rules/UniqueTypeNamesRule.mjs

A Query Language and Runtime which can target any service.

import { GraphQLError } from "../../error/GraphQLError.mjs";
export function UniqueTypeNamesRule(context) {
    const knownTypeNames = new Map();
    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?.getType(typeName)) {
            context.reportError(new GraphQLError(`Type "${typeName}" already exists in the schema. It cannot also be defined in this type definition.`, { nodes: node.name }));
            return;
        }
        const knownNameNode = knownTypeNames.get(typeName);
        if (knownNameNode != null) {
            context.reportError(new GraphQLError(`There can be only one type named "${typeName}".`, {
                nodes: [knownNameNode, node.name],
            }));
        }
        else {
            knownTypeNames.set(typeName, node.name);
        }
        return false;
    }
}
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