@wordpress/api-fetch/build-module/utils/response.js

Utility to make WordPress REST API requests.

/**
 * WordPress dependencies
 */
import { __ } from '@wordpress/i18n';

/**
 * Parses the apiFetch response.
 *
 * @param {Response} response
 * @param {boolean}  shouldParseResponse
 *
 * @return {Promise<any> | null | Response} Parsed response.
 */
const parseResponse = (response, shouldParseResponse = true) => {
  if (shouldParseResponse) {
    if (response.status === 204) {
      return null;
    }
    return response.json ? response.json() : Promise.reject(response);
  }
  return response;
};

/**
 * Calls the `json` function on the Response, throwing an error if the response
 * doesn't have a json function or if parsing the json itself fails.
 *
 * @param {Response} response
 * @return {Promise<any>} Parsed response.
 */
const parseJsonAndNormalizeError = response => {
  const invalidJsonError = {
    code: 'invalid_json',
    message: __('The response is not a valid JSON response.')
  };
  if (!response || !response.json) {
    throw invalidJsonError;
  }
  return response.json().catch(() => {
    throw invalidJsonError;
  });
};

/**
 * Parses the apiFetch response properly and normalize response errors.
 *
 * @param {Response} response
 * @param {boolean}  shouldParseResponse
 *
 * @return {Promise<any>} Parsed response.
 */
export const parseResponseAndNormalizeError = (response, shouldParseResponse = true) => {
  return Promise.resolve(parseResponse(response, shouldParseResponse)).catch(res => parseAndThrowError(res, shouldParseResponse));
};

/**
 * Parses a response, throwing an error if parsing the response fails.
 *
 * @param {Response} response
 * @param {boolean}  shouldParseResponse
 * @return {Promise<any>} Parsed response.
 */
export function parseAndThrowError(response, shouldParseResponse = true) {
  if (!shouldParseResponse) {
    throw response;
  }
  return parseJsonAndNormalizeError(response).then(error => {
    const unknownError = {
      code: 'unknown_error',
      message: __('An unknown error occurred.')
    };
    throw error || unknownError;
  });
}
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