Fixing undefined type on default export

src/index.ts

@@ -292,7 +292,7 @@ export class LoggingBase {
    }
 }
 
-export let Logging = undefined;
+export let Logging: LoggingBase = undefined;
 if (process.env.LOGGING_NO_DEFAULT !== "true") {
    Logging = new LoggingBase();
 }