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

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+import { ASTVisitor } from '../../language/visitor';
+import { SDLValidationContext } from '../ValidationContext';
+
+export function schemaDefinitionNotAloneMessage(): string;
+
+export function canNotDefineSchemaWithinExtensionMessage(): string;
+
+/**
+ * Lone Schema definition
+ *
+ * A GraphQL document is only valid if it contains only one schema definition.
+ */
+export function LoneSchemaDefinition(context: SDLValidationContext): ASTVisitor;