/** @category Validation */
import type { Maybe } from '../jsutils/Maybe';
import { GraphQLError } from '../error/GraphQLError';
import type { DocumentNode } from '../language/ast';
import type { GraphQLSchema } from '../type/schema';
import { TypeInfo } from '../utilities/TypeInfo';
import type { SDLValidationRule, ValidationRule } from './ValidationContext';
/**
 * Options used when validating a GraphQL document.
 * @internal
 */
export interface ValidationOptions {
  /**
   * Maximum number of validation errors before validation stops.
   * @internal
   */
  maxErrors?: number;
}
/**
 * Implements the "Validation" section of the spec.
 *
 * Validation runs synchronously, returning an array of encountered errors, or
 * an empty array if no errors were encountered and the document is valid.
 *
 * A list of specific validation rules may be provided. If not provided, the
 * default list of rules defined by the GraphQL specification will be used.
 *
 * Each validation rule is a function that returns a visitor
 * (see the language/visitor API). Visitor methods are expected to return
 * GraphQLErrors, or Arrays of GraphQLErrors when invalid.
 *
 * Validate will stop validation after a `maxErrors` limit has been reached.
 * Attackers can send pathologically invalid queries to induce a DoS attack,
 * so `maxErrors` defaults to 100 errors.
 *
 * Optionally a custom TypeInfo instance may be provided. If not provided, one
 * will be created from the provided schema.
 * @param schema - Schema to validate against.
 * @param documentAST - Document AST to validate.
 * @param rules - Validation rules to apply.
 * @param options - Validation options, including error limits.
 * @param typeInfo - TypeInfo instance to update during traversal.
 * @returns Validation errors, or an empty array when the document is valid.
 * @example
 * ```ts
 * // Validate with the default specified rules.
 * import { parse } from 'graphql/language';
 * import { buildSchema } from 'graphql/utilities';
 * import { validate } from 'graphql/validation';
 *
 * const schema = buildSchema(`
 *   type Query {
 *     greeting: String
 *   }
 * `);
 *
 * validate(schema, parse('{ greeting }')); // => []
 *
 * const errors = validate(schema, parse('{ missing }'));
 * errors[0].message; // => 'Cannot query field "missing" on type "Query".'
 * ```
 * @example
 * ```ts
 * // This variant uses a custom rule list, TypeInfo, and validation options.
 * import { parse } from 'graphql/language';
 * import { buildSchema, TypeInfo } from 'graphql/utilities';
 * import { FieldsOnCorrectTypeRule, validate } from 'graphql/validation';
 *
 * const schema = buildSchema(`
 *   type Query {
 *     greeting: String
 *   }
 * `);
 * const document = parse('{ missingOne missingTwo }');
 *
 * const errors = validate(
 *   schema,
 *   document,
 *   [FieldsOnCorrectTypeRule],
 *   { maxErrors: 1 },
 *   new TypeInfo(schema),
 * );
 *
 * errors.length; // => 2
 * errors[1].message; // => 'Too many validation errors, error limit reached. Validation aborted.'
 * ```
 */
export declare function validate(
  schema: GraphQLSchema,
  documentAST: DocumentNode,
  rules?: ReadonlyArray<ValidationRule>,
  options?: ValidationOptions,
  /**
   * Deprecated TypeInfo instance used to track traversal state during
   * validation. Omit this argument so validate creates the TypeInfo instance.
   * @deprecated will be removed in 17.0.0
   */
  typeInfo?: TypeInfo,
): ReadonlyArray<GraphQLError>;
/** @internal */
export declare function validateSDL(
  documentAST: DocumentNode,
  schemaToExtend?: Maybe<GraphQLSchema>,
  rules?: ReadonlyArray<SDLValidationRule>,
): ReadonlyArray<GraphQLError>;
/**
 * Utility function which asserts a SDL document is valid by throwing an error
 * if it is invalid.
 *
 * @internal
 */
export declare function assertValidSDL(documentAST: DocumentNode): void;
/**
 * Utility function which asserts a SDL document is valid by throwing an error
 * if it is invalid.
 *
 * @internal
 */
export declare function assertValidSDLExtension(
  documentAST: DocumentNode,
  schema: GraphQLSchema,
): void;