import { SourceLocation } from '../language/location';

import { GraphQLError } from './GraphQLError';

/**
 * Given a GraphQLError, format it according to the rules described by the
 * Response Format, Errors section of the GraphQL Specification.
 */
export function formatError(error: GraphQLError): GraphQLFormattedError;

/**
 * @see https://github.com/graphql/graphql-spec/blob/master/spec/Section%207%20--%20Response.md#errors
 */
export interface GraphQLFormattedError<
  TExtensions extends Record<string, any> = Record<string, any>
> {
  /**
   * A short, human-readable summary of the problem that **SHOULD NOT** change
   * from occurrence to occurrence of the problem, except for purposes of
   * localization.
   */
  readonly message: string;
  /**
   * If an error can be associated to a particular point in the requested
   * GraphQL document, it should contain a list of locations.
   */
  readonly locations?: ReadonlyArray<SourceLocation>;
  /**
   * If an error can be associated to a particular field in the GraphQL result,
   * it _must_ contain an entry with the key `path` that details the path of
   * the response field which experienced the error. This allows clients to
   * identify whether a null result is intentional or caused by a runtime error.
   */
  readonly path?: ReadonlyArray<string | number>;
  /**
   * Reserved for implementors to extend the protocol however they see fit,
   * and hence there are no additional restrictions on its contents.
   */
  readonly extensions?: TExtensions;
}