fix: use package.cjs import instead of requiring package.json (#506)

src/core/request.js

@@ -10,7 +10,6 @@
  * governing permissions and limitations under the License.
  */
 
-import { createRequire } from 'module';
 import { types } from 'util';
 import { Readable } from 'stream';
 import tls from 'tls';
@@ -25,8 +24,7 @@ import lock from './lock.js';
 import { isFormData, FormDataSerializer } from '../common/formData.js';
 import { isPlainObject } from '../common/utils.js';
 
-const require = createRequire(import.meta.url);
-const pkg = require('../../package.json');
+import pkg from '../package.cjs';
 
 const { version } = pkg;
 

src/package.cjs

@@ -0,0 +1,12 @@
+/*
+ * Copyright 2021 Adobe. All rights reserved.
+ * This file is licensed to you 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 http://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 REPRESENTATIONS
+ * OF ANY KIND, either express or implied. See the License for the specific language
+ * governing permissions and limitations under the License.
+ */
+module.exports = require('../package.json');

test/core/index.test.js

@@ -26,6 +26,7 @@ import { isReadableStream, parseMultiPartFormData } from '../utils.js';
 import { AbortController } from '../../src/fetch/abort.js';
 import { RequestAbortedError } from '../../src/core/errors.js';
 import core from '../../src/core/index.js';
+import pkg from '../../src/package.cjs';
 import Server from '../server.js';
 
 const HELLO_WORLD = 'Hello, World!';
@@ -242,6 +243,23 @@ describe('Core Tests', () => {
     assert((ts1 - ts0) < 1000 * 1.1);
   });
 
+  it('standard user agent contains package version', async () => {
+    const customCtx = context({
+      rejectUnauthorized: false,
+    });
+    try {
+      const resp = await customCtx.request(`${server.origin}/inspect`);
+      assert.strictEqual(resp.statusCode, 200);
+      assert.strictEqual(resp.headers['content-type'], 'application/json');
+
+      const buf = await readStream(resp.readable);
+      const json = JSON.parse(buf);
+      assert.strictEqual(json.headers['user-agent'], `adobe-fetch/${pkg.version}`);
+    } finally {
+      await customCtx.reset();
+    }
+  });
+
   it('overriding user-agent works (context)', async () => {
     const customUserAgent = 'custom-agent';
     const customCtx = context({