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import Maybe from '../tsutils/Maybe.d.ts';import { GraphQLError } from '../error/GraphQLError.d.ts';import { ASTVisitor } from '../language/visitor.d.ts';import {  DocumentNode,  OperationDefinitionNode,  VariableNode,  SelectionSetNode,  FragmentSpreadNode,  FragmentDefinitionNode,} from '../language/ast.d.ts';import { GraphQLSchema } from '../type/schema.d.ts';import { GraphQLDirective } from '../type/directives.d.ts';import {  GraphQLInputType,  GraphQLOutputType,  GraphQLCompositeType,  GraphQLField,  GraphQLArgument,} from '../type/definition.d.ts';import { TypeInfo } from '../utilities/TypeInfo.d.ts';
type NodeWithSelectionSet = OperationDefinitionNode | FragmentDefinitionNode;type VariableUsage = {  readonly node: VariableNode;  readonly type: Maybe<GraphQLInputType>;  readonly defaultValue: Maybe<any>;};
/** * An instance of this class is passed as the "this" context to all validators, * allowing access to commonly useful contextual information from within a * validation rule. */export class ASTValidationContext {  constructor(ast: DocumentNode, onError: (err: GraphQLError) => void);
  reportError(error: GraphQLError): undefined;
  getDocument(): DocumentNode;
  getFragment(name: string): Maybe<FragmentDefinitionNode>;
  getFragmentSpreads(node: SelectionSetNode): ReadonlyArray<FragmentSpreadNode>;
  getRecursivelyReferencedFragments(    operation: OperationDefinitionNode,  ): ReadonlyArray<FragmentDefinitionNode>;}
export class SDLValidationContext extends ASTValidationContext {  constructor(    ast: DocumentNode,    schema: Maybe<GraphQLSchema>,    onError: (err: GraphQLError) => void,  );
  getSchema(): Maybe<GraphQLSchema>;}
export type SDLValidationRule = (context: SDLValidationContext) => ASTVisitor;
export class ValidationContext extends ASTValidationContext {  constructor(    schema: GraphQLSchema,    ast: DocumentNode,    typeInfo: TypeInfo,    onError: (err: GraphQLError) => void,  );
  getSchema(): GraphQLSchema;
  getVariableUsages(node: NodeWithSelectionSet): ReadonlyArray<VariableUsage>;
  getRecursivelyReferencedFragments(    operation: OperationDefinitionNode,  ): ReadonlyArray<FragmentDefinitionNode>;
  getType(): Maybe<GraphQLOutputType>;
  getParentType(): Maybe<GraphQLCompositeType>;
  getInputType(): Maybe<GraphQLInputType>;
  getParentInputType(): Maybe<GraphQLInputType>;
  getFieldDef(): Maybe<GraphQLField<any, any>>;
  getDirective(): Maybe<GraphQLDirective>;
  getArgument(): Maybe<GraphQLArgument>;}
export type ValidationRule = (context: ValidationContext) => ASTVisitor;