| 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))); |
| } |
| } |
| } |
| }; |
| } |