Fix JS and TS clients compatibility with older Nodejs versions (#60)

.gitignore

@@ -5,3 +5,4 @@
 config-test.json
 *.sw?
 .idea/
+.vscode

nodejs/client.js

@@ -158,12 +158,15 @@ async function main() {
   await new Promise((resolve, reject) => {
     stream.write(request, (err) => {
       stream.end();
-      if (err === null) {
+      if (err === null || err === undefined) {
         resolve();
       } else {
         reject(err);
       }
     });
+  }).catch((reason) => {
+    console.error(reason);
+    throw reason;
   });
 
   await stream_closed;

typescript/src/client.ts

@@ -155,12 +155,15 @@ async function main() {
   await new Promise<void>((resolve, reject) => {
     stream.write(request, (err) => {
       stream.end();
-      if (err === null) {
+      if (err === null || err === undefined) {
         resolve();
       } else {
         reject(err);
       }
     });
+  }).catch((reason) => {
+    console.error(reason);
+    throw reason;
   });
 
   await stream_closed;