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export class Observable {
  constructor(private promise: Promise) {}

  toPromise() {
    return this.promise;
  }

  pipe(callback: (value: T) => S | Promise): Observable {
    return new Observable(this.promise.then(callback));
  }
}

export function from(promise: Promise) {
  return new Observable(promise);
}

export function of(value: T) {
  return new Observable(Promise.resolve(value));
}

export function mergeMap(callback: (value: T) => Observable) {
  return (value: T) => callback(value).toPromise();
}

export function map(callback: any) {
  return callback;
}