split impressionsDisabled from properties

Author: ZamoraEmmanuel

src/utils/inputValidation/eventProperties.ts

@@ -70,7 +70,12 @@ export function validateEventProperties(log: ILogger, maybeProperties: any, meth
 export function validateEvaluationOptions(log: ILogger, maybeOptions: any, method: string): SplitIO.EvaluationOptions | undefined {
   if (isObject(maybeOptions)) {
     const properties = validateEventProperties(log, maybeOptions.properties, method).properties;
-    return properties && Object.keys(properties).length > 0 ? { properties } : undefined;
+    let options =  properties && Object.keys(properties).length > 0 ? { properties } : undefined;
+
+    const impressionsDisabled = maybeOptions.impressionsDisabled;
+    if (!impressionsDisabled) return options;
+
+    return options ? { ...options, impressionsDisabled } : { impressionsDisabled };
   } else if (maybeOptions) {
     log.error(ERROR_NOT_PLAIN_OBJECT, [method, 'evaluation options']);
   }