@dillonkearns/elm-graphql/examples/src/subscription/node_modules/@jumpn/utils-graphql/compat/cjs/errorsToString.js.flow

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// @flow

import type {GqlError} from "./types";

const locationsToString = locations =>
  locations.map(({column, line}) => `${line}:${column}`).join("; ");

const errorToString = ({message, locations}) =>
  message + (locations ? ` (${locationsToString(locations)})` : "");

/**
 * Transforms an array of GqlError into a string.
 *
 * @example
 *
 * const gqlRespose = {
 *   errors: [
 *     {message: "First Error", locations: [{column: 10, line: 2}]},
 *     {message: "Second Error", locations: [{column: 2, line: 4}]}
 *   ]
 * }
 *
 * const error = errorsToString(gqlRespose.errors);
 * // string with the following:
 * // First Error (2:10)
 * // Second Error (4:2)
 */
const errorsToString = (gqlErrors: Array<GqlError>): string =>
  gqlErrors.map(errorToString).join("\n");

export default errorsToString;