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19 lines
711 B
19 lines
711 B
import { GraphQLError } from "../../error/GraphQLError.mjs";
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/**
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* Subscriptions must only include one field.
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*
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* A GraphQL subscription is valid only if it contains a single root field.
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*/
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export function SingleFieldSubscriptionsRule(context) {
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return {
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OperationDefinition: function OperationDefinition(node) {
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if (node.operation === 'subscription') {
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if (node.selectionSet.selections.length !== 1) {
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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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}
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}
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}
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};
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}
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