Add XQuery Execution

src/services/ChildProcess.ts

@@ -0,0 +1,23 @@
+'use strict';
+
+let child_process = require('child_process');
+
+export class ChildProcess {
+    static async spawnAsync(executable: string, args: string[]): Promise<void> {
+        return new Promise<void>((resolve, reject) => {
+           
+           let handle = child_process.spawn(executable, args);
+           
+           handle.on('close', (code: string) => {
+               if (code == '0') {
+                   resolve();
+               }
+               
+               else {
+                   reject(code);
+               }
+           });
+            
+        });
+    }
+}