/** @category Introspection */
import type { GraphQLNamedType } from "./definition.js";
import { GraphQLEnumType, GraphQLField, GraphQLObjectType } from "./definition.js";
/** The introspection type describing a GraphQL schema. */
export declare const __Schema: GraphQLObjectType;
/** The introspection type describing a GraphQL directive. */
export declare const __Directive: GraphQLObjectType;
/** The introspection enum describing directive locations. */
export declare const __DirectiveLocation: GraphQLEnumType;
/** The introspection type describing GraphQL types. */
export declare const __Type: GraphQLObjectType;
/** The introspection type describing object and interface fields. */
export declare const __Field: GraphQLObjectType;
/** The introspection type describing arguments and input fields. */
export declare const __InputValue: GraphQLObjectType;
/** The introspection type describing enum values. */
export declare const __EnumValue: GraphQLObjectType;
/**
 * The introspection enum describing the different kinds of GraphQL types.
 * @category Introspection
 */
export declare const TypeKind: {
    readonly SCALAR: "SCALAR";
    readonly OBJECT: "OBJECT";
    readonly INTERFACE: "INTERFACE";
    readonly UNION: "UNION";
    readonly ENUM: "ENUM";
    readonly INPUT_OBJECT: "INPUT_OBJECT";
    readonly LIST: "LIST";
    readonly NON_NULL: "NON_NULL";
};
/**
 * The introspection enum describing the different kinds of GraphQL types.
 * @category Introspection
 */
export type TypeKind = (typeof TypeKind)[keyof typeof TypeKind];
/** The introspection enum describing GraphQL type kinds. */
export declare const __TypeKind: GraphQLEnumType;
/**
 * Note that these are GraphQLField and not GraphQLFieldConfig,
 * so the format for args is different.
 */
export declare const SchemaMetaFieldDef: GraphQLField<unknown, unknown>;
/** The `__type` meta field definition used by introspection. */
export declare const TypeMetaFieldDef: GraphQLField<unknown, unknown>;
/** The `__typename` meta field definition used by execution and introspection. */
export declare const TypeNameMetaFieldDef: GraphQLField<unknown, unknown>;
/** All introspection types defined by the GraphQL specification. */
export declare const introspectionTypes: ReadonlyArray<GraphQLNamedType>;
/**
 * Returns true when the type is one of the built-in introspection types.
 * @param type - The GraphQL type to inspect.
 * @returns True when the type is one of the built-in introspection types.
 * @example
 * ```ts
 * import { GraphQLString, isIntrospectionType, __Type } from 'graphql/type';
 *
 * isIntrospectionType(__Type); // => true
 * isIntrospectionType(GraphQLString); // => false
 * ```
 */
export declare function isIntrospectionType(type: GraphQLNamedType): boolean;