Parameter initializers (default values) should be const

[mhevery]

  constructor(public path: string, public child: Url = null,
              public auxiliary: Url[] =[],
              public params: {[key: string]: any} =  {}) {}

was:

  Url(this.path, [this.child = null, this.auxiliary = [], this.params = {}]) {}

should be:

  RootUrl(String path,
  Url(this.path, [this.child = null, this.auxiliary = const [], this.params = const {}]) {}

• const [] instead of []
• const {} instead of {}

[mhevery]

Also:

export const ROUTER_DIRECTIVES: any[] = /*@ts2dart_const*/[RouterOutlet, RouterLink];

creates

final List<dynamic> ROUTER_DIRECTIVES = [RouterOutlet, RouterLink];

missing const

[mprobst]

This was caused by a confusing versioning issue in npm, but the issue still holds - parameter initializers should always implictly be const.