swc/crates/swc_bundler/tests/.cache/deno/15ff69e5ba79d52cb453376285fe4fd42ba6f193.ts

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// Loaded from https://deno.land/x/graphql_deno@v15.0.0/lib/validation/rules/SingleFieldSubscriptionsRule.js
import { GraphQLError } from '../../error/GraphQLError.js';
/**
* 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(node) {
if (node.operation === 'subscription') {
if (node.selectionSet.selections.length !== 1) {
context.reportError(new GraphQLError(node.name ? `Subscription "${node.name.value}" must select only one top level field.` : 'Anonymous Subscription must select only one top level field.', node.selectionSet.selections.slice(1)));
}
}
}
};
}