import { TypeNode, NamedTypeNode, ListTypeNode, NonNullTypeNode } from "../language/ast";
import { GraphQLType, GraphQLNullableType, GraphQLNamedType, GraphQLList, GraphQLNonNull } from "../type/definition";
import { GraphQLSchema } from "../type/schema";

/**
 * Given a Schema and an AST node describing a type, return a GraphQLType
 * definition which applies to that type. For example, if provided the parsed
 * AST node for `[User]`, a GraphQLList instance will be returned, containing
 * the type called "User" found in the schema. If a type called "User" is not
 * found in the schema, then undefined will be returned.
 */
export function typeFromAST(schema: GraphQLSchema, typeNode: NamedTypeNode): GraphQLNamedType | undefined;

export function typeFromAST(schema: GraphQLSchema, typeNode: ListTypeNode): GraphQLList<any> | undefined;

export function typeFromAST(schema: GraphQLSchema, typeNode: NonNullTypeNode): GraphQLNonNull<any> | undefined;