[BUG] Routes with data enum throw error

Overview of the issue

Having a route with a data element that contains an enum throws an error:

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { ErrorComponent } from './error.component';
import { ErrorPage } from './error.interfaces';

const routes: Routes = [
  {
    path:        '404',
    component:   ErrorComponent,
    data: {
      errorType: ErrorPage.PageNotFound, // <--- This throws the error
    }
  },
];

@NgModule({
  imports: [
    RouterModule.forChild(routes)
  ],
  exports: [
    RouterModule
  ]
})
export class ErrorRoutingModule {
}

Error:

[14:29:43] Analysing routes definitions and clean them if necessary Unhandled Rejection at: Promise { <rejected> InvalidOperationError: Expected to find an initializer.

Operating System, Node.js, npm, compodoc version(s)

OS: macOS 11.1 Node: v15.6.0 NPM: 7.4.0 compodoc: 1.1.11

[csutorasr]

The issue also happening, if you use enum as a string for the path.

[MickL]

I am on 1.1.14 now, shows error in console:

[11:18:37] Error during generation of routes JSON file, maybe a trailing comma or an external variable inside one route.

Storybook is working anyway. Before the build stopped.