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- import { GraphQLError } from "../../error/GraphQLError.mjs";
- /**
- * Subscriptions must only include one field.
- *
- * A GraphQL subscription is valid only if it contains a single root field.
- */
- export function SingleFieldSubscriptionsRule(context) {
- return {
- OperationDefinition: function OperationDefinition(node) {
- if (node.operation === 'subscription') {
- if (node.selectionSet.selections.length !== 1) {
- context.reportError(new GraphQLError(node.name ? "Subscription \"".concat(node.name.value, "\" must select only one top level field.") : 'Anonymous Subscription must select only one top level field.', node.selectionSet.selections.slice(1)));
- }
- }
- }
- };
- }
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