import type { Path } from '../jsutils/Path';
import type { ObjMap } from '../jsutils/ObjMap';
import type { PromiseOrValue } from '../jsutils/PromiseOrValue';
import type { Maybe } from '../jsutils/Maybe';
import type { GraphQLFormattedError } from '../error/GraphQLError';
import { GraphQLError } from '../error/GraphQLError';
import type {
  DocumentNode,
  OperationDefinitionNode,
  FieldNode,
  FragmentDefinitionNode,
} from '../language/ast';
import type { GraphQLSchema } from '../type/schema';
import type {
  GraphQLObjectType,
  GraphQLField,
  GraphQLFieldResolver,
  GraphQLResolveInfo,
  GraphQLTypeResolver,
} from '../type/definition';
/**
 * Terminology
 *
 * "Definitions" are the generic name for top-level statements in the document.
 * Examples of this include:
 * 1) Operations (such as a query)
 * 2) Fragments
 *
 * "Operations" are a generic name for requests in the document.
 * Examples of this include:
 * 1) query,
 * 2) mutation
 *
 * "Selections" are the definitions that can appear legally and at
 * single level of the query. These include:
 * 1) field references e.g `a`
 * 2) fragment "spreads" e.g. `...c`
 * 3) inline fragment "spreads" e.g. `...on Type { a }`
 */
/**
 * Data that must be available at all points during query execution.
 *
 * Namely, schema of the type system that is currently executing,
 * and the fragments defined in the query document
 */
export interface ExecutionContext {
  schema: GraphQLSchema;
  fragments: ObjMap<FragmentDefinitionNode>;
  rootValue: unknown;
  contextValue: unknown;
  operation: OperationDefinitionNode;
  variableValues: {
    [variable: string]: unknown;
  };
  fieldResolver: GraphQLFieldResolver<any, any>;
  typeResolver: GraphQLTypeResolver<any, any>;
  subscribeFieldResolver: GraphQLFieldResolver<any, any>;
  errors: Array<GraphQLError>;
}
/**
 * The result of GraphQL execution.
 *
 *   - `errors` is included when any errors occurred as a non-empty array.
 *   - `data` is the result of a successful execution of the query.
 *   - `extensions` is reserved for adding non-standard properties.
 */
export interface ExecutionResult<
  TData = ObjMap<unknown>,
  TExtensions = ObjMap<unknown>,
> {
  errors?: ReadonlyArray<GraphQLError>;
  data?: TData | null;
  extensions?: TExtensions;
}
export interface FormattedExecutionResult<
  TData = ObjMap<unknown>,
  TExtensions = ObjMap<unknown>,
> {
  errors?: ReadonlyArray<GraphQLFormattedError>;
  data?: TData | null;
  extensions?: TExtensions;
}
export interface ExecutionArgs {
  schema: GraphQLSchema;
  document: DocumentNode;
  rootValue?: unknown;
  contextValue?: unknown;
  variableValues?: Maybe<{
    readonly [variable: string]: unknown;
  }>;
  operationName?: Maybe<string>;
  fieldResolver?: Maybe<GraphQLFieldResolver<any, any>>;
  typeResolver?: Maybe<GraphQLTypeResolver<any, any>>;
  subscribeFieldResolver?: Maybe<GraphQLFieldResolver<any, any>>;
}
/**
 * Implements the "Executing requests" section of the GraphQL specification.
 *
 * Returns either a synchronous ExecutionResult (if all encountered resolvers
 * are synchronous), or a Promise of an ExecutionResult that will eventually be
 * resolved and never rejected.
 *
 * If the arguments to this function do not result in a legal execution context,
 * a GraphQLError will be thrown immediately explaining the invalid input.
 */
export declare function execute(
  args: ExecutionArgs,
): PromiseOrValue<ExecutionResult>;
/**
 * Also implements the "Executing requests" section of the GraphQL specification.
 * However, it guarantees to complete synchronously (or throw an error) assuming
 * that all field resolvers are also synchronous.
 */
export declare function executeSync(args: ExecutionArgs): ExecutionResult;
/**
 * Essential assertions before executing to provide developer feedback for
 * improper use of the GraphQL library.
 *
 * @internal
 */
export declare function assertValidExecutionArguments(
  schema: GraphQLSchema,
  document: DocumentNode,
  rawVariableValues: Maybe<{
    readonly [variable: string]: unknown;
  }>,
): void;
/**
 * Constructs a ExecutionContext object from the arguments passed to
 * execute, which we will pass throughout the other execution methods.
 *
 * Throws a GraphQLError if a valid execution context cannot be created.
 *
 * @internal
 */
export declare function buildExecutionContext(
  args: ExecutionArgs,
): ReadonlyArray<GraphQLError> | ExecutionContext;
/**
 * @internal
 */
export declare function buildResolveInfo(
  exeContext: ExecutionContext,
  fieldDef: GraphQLField<unknown, unknown>,
  fieldNodes: ReadonlyArray<FieldNode>,
  parentType: GraphQLObjectType,
  path: Path,
): GraphQLResolveInfo;
/**
 * If a resolveType function is not given, then a default resolve behavior is
 * used which attempts two strategies:
 *
 * First, See if the provided value has a `__typename` field defined, if so, use
 * that value as name of the resolved type.
 *
 * Otherwise, test each possible type for the abstract type by calling
 * isTypeOf for the object being coerced, returning the first type that matches.
 */
export declare const defaultTypeResolver: GraphQLTypeResolver<unknown, unknown>;
/**
 * If a resolve function is not given, then a default resolve behavior is used
 * which takes the property of the source object of the same name as the field
 * and returns it as the result, or if it's a function, returns the result
 * of calling that function while passing along args and context value.
 */
export declare const defaultFieldResolver: GraphQLFieldResolver<
  unknown,
  unknown
>;
/**
 * This method looks up the field on the given type definition.
 * It has special casing for the three introspection fields,
 * __schema, __type and __typename. __typename is special because
 * it can always be queried as a field, even in situations where no
 * other fields are allowed, like on a Union. __schema and __type
 * could get automatically added to the query type, but that would
 * require mutating type definitions, which would cause issues.
 *
 * @internal
 */
export declare function getFieldDef(
  schema: GraphQLSchema,
  parentType: GraphQLObjectType,
  fieldNode: FieldNode,
): Maybe<GraphQLField<unknown, unknown>>;