hunk.code_window: import { _finally, FinallySignature } from '../../operator/finally';
   Observable.prototype.finally = _finally;
   declare module '../../Observable' {
     interface Observable<T> {
       finally: FinallySignature<T>;
  
hunk.labels: keep keep add keep keep keep keep
hunk.after_edit: Observable.prototype._finally = _finally;
  
hunk.file_path: src/add/operator/finally.ts
hunk.type: add
file: 
  import { Observable } from '../../Observable';
  import { concat, ConcatSignature } from '../../operator/concat';
  
  Observable.prototype.concat = concat;
  
  declare module '../../Observable' {
    interface Observable<T> {
      concat: ConcatSignature<T>;
    }
  }