message: refactor(router): add type annotation for UrlSegment.parameterMap
  Having the type specified explicitly makes the API reference more readable.
  PR Close
diff: @@ -293,7 +293,7 @@ export class UrlSegment {
  /** The matrix parameters associated with a segment */
  public parameters: {[name: string]: string}) {}
  - get parameterMap() {
  + get parameterMap(): ParamMap {
  if (!this._parameterMap) {
  this._parameterMap = convertToParamMap(this.parameters);
  }
  