I'm running under the following configurations
Angular CLI: 6.2.9
Node: 8.9.4
ng-busy: 6.2.0

In following your example with the following code
`@NgModule({

imports: [
 ...
 NgBusyModule.forRoot(new BusyConfig({...`

Running the build ng build --prod results in a build fail stating

Function calls are not supported in decorators but BusyConfig was called.

Is there something I'm missing that ought to be done?