RxJS TS readability example

Observable.ts

// HACK: Since TypeScript inherits static properties too, we have to
// fight against TypeScript here so Subject can have a different static create signature
/**
 * Creates a new cold Observable by calling the Observable constructor
 * @static true
 * @owner Observable
 * @method create
 * @param {Function} subscribe? the subscriber function to be passed to the Observable constructor
 * @return {Observable} a new cold observable
 * @nocollapse
 * @deprecated use new Observable() instead
 */
static create: Function = <T>(subscribe?: (subscriber: Subscriber<T>) => TeardownLogic) => {
  return new Observable<T>(subscribe);
}