refactor: use async API

Author: snitin315

lib/Server.js

@@ -332,7 +332,7 @@ class Server {
               "SSL Certificate is more than 30 days old. Removing..."
             );
 
-            del.sync([certificatePath], { force: true });
+            await del([certificatePath], { force: true });
 
             certificateExists = false;
           }
@@ -405,13 +405,35 @@ class Server {
             ],
           });
 
-          fs.mkdirSync(certificateDir, { recursive: true });
-          fs.writeFileSync(certificatePath, pems.private + pems.cert, {
-            encoding: "utf8",
+          await fs.mkdir(certificateDir, { recursive: true }, (error) => {
+            if (error) {
+              this.logger.error(error);
+              process.exit(2);
+            }
           });
+
+          await fs.writeFile(
+            certificatePath,
+            pems.private + pems.cert,
+            {
+              encoding: "utf8",
+            },
+            (error) => {
+              if (error) {
+                this.logger.error(error);
+                process.exit(2);
+              }
+            }
+          );
         }
 
-        fakeCert = fs.readFileSync(certificatePath);
+        fakeCert = await fs.readFile(certificatePath, (error, data) => {
+          if (error) {
+            this.logger.error(error);
+            process.exit(2);
+          }
+          return data;
+        });
 
         this.logger.info(`SSL certificate: ${certificatePath}`);
       }
@@ -1763,7 +1785,12 @@ class Server {
       // chmod 666 (rw rw rw)
       const READ_WRITE = 438;
 
-      fs.chmodSync(this.options.ipc, READ_WRITE);
+      await fs.chmod(this.options.ipc, READ_WRITE, (error) => {
+        if (error) {
+          this.logger.error(error);
+          process.exit(2);
+        }
+      });
     }
 
     if (this.options.webSocketServer) {