fix: callback type checking fixes #304

src/SASjs.ts

@@ -550,7 +550,10 @@ export default class SASjs {
       ...this.sasjsConfig,
       ...config
     }
-
+    if (
+      typeof loginRequiredCallback === 'function' ||
+      typeof loginRequiredCallback === 'undefined'
+    ) {
       if (config.serverType === ServerType.SasViya && config.contextName) {
         if (config.useComputeApi) {
           return await this.computeJobExecutor!.execute(
@@ -577,6 +580,13 @@ export default class SASjs {
           loginRequiredCallback
         )
       }
+    } else {
+      return Promise.reject(
+        new ErrorResponse(
+          `Invalid loginRequiredCallback parameter was provided. Expected Callback function but found ${typeof loginRequiredCallback}`
+        )
+      )
+    }
   }
 
   /**