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node_modules/graphql/validation/rules/SingleFieldSubscriptions.d.ts

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+import Maybe from '../../tsutils/Maybe';
+import { ASTVisitor } from '../../language/visitor';
+import { ASTValidationContext } from '../ValidationContext';
+
+export function singleFieldOnlyMessage(name: Maybe<string>): string;
+
+/**
+ * Subscriptions must only include one field.
+ *
+ * A GraphQL subscription is valid only if it contains a single root field.
+ */
+export function SingleFieldSubscriptions(
+  context: ASTValidationContext,
+): ASTVisitor;