graphql/validation/rules/UniqueOperationTypesRule.mjs

A Query Language and Runtime which can target any service.

import { GraphQLError } from "../../error/GraphQLError.mjs";
export function UniqueOperationTypesRule(context) {
    const schema = context.getSchema();
    const definedOperationTypes = new Map();
    const existingOperationTypes = schema
        ? {
            query: schema.getQueryType(),
            mutation: schema.getMutationType(),
            subscription: schema.getSubscriptionType(),
        }
        : {};
    return {
        SchemaDefinition: checkOperationTypes,
        SchemaExtension: checkOperationTypes,
    };
    function checkOperationTypes(node) {
        const operationTypesNodes = node.operationTypes ?? [];
        for (const operationType of operationTypesNodes) {
            const operation = operationType.operation;
            const alreadyDefinedOperationType = definedOperationTypes.get(operation);
            if (existingOperationTypes[operation]) {
                context.reportError(new GraphQLError(`Type for ${operation} already defined in the schema. It cannot be redefined.`, { nodes: operationType }));
            }
            else if (alreadyDefinedOperationType) {
                context.reportError(new GraphQLError(`There can be only one ${operation} type in schema.`, { nodes: [alreadyDefinedOperationType, operationType] }));
            }
            else {
                definedOperationTypes.set(operation, operationType);
            }
        }
        return false;
    }
}
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