BewareMyPower commented on code in PR #301:
URL: 
https://github.com/apache/pulsar-client-node/pull/301#discussion_r1116787312


##########
src/Client.js:
##########
@@ -0,0 +1,65 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * 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 CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+const tls = require('tls');
+const fs = require('fs');
+const os = require('os');
+const PulsarBinding = require('./pulsar-binding');
+
+const tmpCertsFilePath = `${__dirname}/cert.pem`;
+
+class Client {
+  constructor(params) {
+    if (typeof params.tlsTrustCertsFilePath === 'undefined') {
+      fs.rmSync(tmpCertsFilePath, { force: true });
+      const fd = fs.openSync(tmpCertsFilePath, 'a');
+      try {
+        tls.rootCertificates.forEach((cert) => {
+          fs.appendFileSync(fd, cert + os.EOL);
+        });
+      } finally {
+        fs.closeSync(fd);
+      }

Review Comment:
   Here is an example: 
https://www.npmjs.com/package/node_extra_ca_certs_mozilla_bundle?activeTab=explore
   
   It writes the pem files during `npm install`. You can see the effect that:
   
   ```bash
   $ npm install node_extra_ca_certs_mozilla_bundle
   
   added 8 packages in 18s
   
   63 packages are looking for funding
     run `npm fund` for details
   $ ls node_modules/node_extra_ca_certs_mozilla_bundle/ca_bundle
   ca_intermediate_bundle.pem  ca_intermediate_root_bundle.pem  
ca_root_bundle.pem
   ```



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