graphql-yoga/esm/validations/defer-stream-directive-on-root-field.js

import { GraphQLError } from 'graphql';
import { GraphQLDeferDirective } from '../directives/defer.js';
import { GraphQLStreamDirective } from '../directives/stream.js';
/**
 * Stream directive on list field
 *
 * A GraphQL document is only valid if defer directives are not used on root mutation or subscription types.
 */
export function DeferStreamDirectiveOnRootFieldRule(context) {
    return {
        Directive(node) {
            const mutationType = context.getSchema().getMutationType();
            const subscriptionType = context.getSchema().getSubscriptionType();
            const parentType = context.getParentType();
            if (parentType && node.name.value === GraphQLDeferDirective.name) {
                if (mutationType && parentType === mutationType) {
                    context.reportError(new GraphQLError(`Defer directive cannot be used on root mutation type "${parentType.name}".`, { nodes: node }));
                }
                if (subscriptionType && parentType === subscriptionType) {
                    context.reportError(new GraphQLError(`Defer directive cannot be used on root subscription type "${parentType.name}".`, { nodes: node }));
                }
            }
            if (parentType && node.name.value === GraphQLStreamDirective.name) {
                if (mutationType && parentType === mutationType) {
                    context.reportError(new GraphQLError(`Stream directive cannot be used on root mutation type "${parentType.name}".`, { nodes: node }));
                }
                if (subscriptionType && parentType === subscriptionType) {
                    context.reportError(new GraphQLError(`Stream directive cannot be used on root subscription type "${parentType.name}".`, { nodes: node }));
                }
            }
        },
    };
}