feat: add function to remove undefined properties

src/connector-client.ts

@@ -155,6 +155,38 @@ export class ConnectorClient extends Client {
     return thingWithoutReferences as SCAssociatedThingWithoutReferences<THING>;
   }
 
+  /**
+   * Recursively deletes all undefined properties from an object instance
+   *
+   * @param obj Object to delete undefined properties from
+   */
+  static removeUndefinedProperties(obj: object): void {
+    // return atomic data types and arrays (recursion anchor)
+    if (typeof obj !== 'object' || Array.isArray(obj)) {
+      return;
+    }
+
+    // check each key
+    for (const key in obj) {
+      /* istanbul ignore if */
+      if (!obj.hasOwnProperty(key)) {
+        continue;
+      }
+
+      const indexedObj = obj as { [k: string]: unknown; };
+
+      if (typeof indexedObj[key] === 'undefined') {
+        // delete undefined keyss
+        delete indexedObj[key];
+      } else {
+        // check recursive
+        ConnectorClient.removeUndefinedProperties(indexedObj[key] as object);
+      }
+    }
+
+    return;
+  }
+
   /**
    * Request a bulk transfer to the backend
    *