message: Added declarationMap to list of ignored tsconfig options.
  Otherwise, setting declarationMap causes an error "declarationMap requires declaration to be set".
  Fixes
diff: @@ -14,7 +14,7 @@ export class TypeScriptSource extends OptionsComponent {
  */
  static IGNORED: string[] = [
  'out', 'version', 'help',
  - 'watch', 'declaration', 'declarationDir', 'mapRoot',
  + 'watch', 'declaration', 'declarationDir', 'declarationMap', 'mapRoot',
  'sourceMap', 'inlineSources', 'removeComments'
  ];
  