Source: common-sk/modules/jsonOrThrow.js

// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/** @module common-sk/modules/jsonOrThrow */
// ** The type of Error thrown by jsonOrThrow. */
export class JsonOrThrowError extends Error {
    constructor(resp) {
        super();
        this.message = `Bad network response: ${resp.statusText}`;
        this.resp = resp;
        this.status = resp.status;
    }
}
/** Helper function when making fetch() requests.
 *
 * Checks if the response is ok and converts it to JSON, otherwise it throws.
 *
 * @example
 *
 *    fetch('/_/list').then(jsonOrThrow).then((json) => {
 *      // Do something with the parsed json here.
 *    }).catch((r) => {
 *      if (r.status === 403) {
 *        // Handle HTTP response 403 - not authorized here.
 *      } else {
 *        console.err(r.message);
 *      }
 *    });
 *
 * @throws A JsonOrThrowErrr. See the [Response docs]{@link https://developer.mozilla.org/en-US/docs/Web/API/Response }
 *         for more detail on reading resp (e.g. resp.text()).
 */
export function jsonOrThrow(resp) {
    if (resp.ok) {
        return resp.json();
    }
    throw new JsonOrThrowError(resp);
}
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