share() All Returned Observables?

We recently switched from restangular to nswag in an Angular 5/Typescript project. One thing that restangular did nicely was that the results of each http request were shared, so multiple subscriptions would not trigger multiple HTTP requests.

For example:

const service = this.nSwagService.getDataFromApi();
service.subscribe(() => {
   // Do something with the results
});
service.subscribe(() => {
   // Do something different with the results later
});

The way nswag outputs the Angular Typescript clients, the observables they return are not shared:

return Observable.fromPromise(this.transformOptions(options_)).flatMap(transformedOptions_ => {
	return this.http.request("post", url_, transformedOptions_);
}).flatMap((response_: any) => {
	return this.transformResult(url_, response_, (r) => this.process(<any>r));
}).catch((response_: any) => {
	if (response_ instanceof HttpResponseBase) {
		try {
			return this.transformResult(url_, response_, (r) => this.process(<any>r));
		} catch (e) {
			return <Observable<any | null>><any>Observable.throw(e);
		}
	} else
		return <Observable<any | null>><any>Observable.throw(response_);
});

By simply adding .share() to the end of the previous block, the results of the HTTP request can be easily shared. This could make nswag behave a little more like some other RESTful client libraries (and a little more like promises, for better or for worse). Is there already a way to do this in the Typescript client generator? If not, would you be interested in adding this as an option?

[RicoSuter]

Quick answer: undefined is controlled by required in the spec, null is controlled by isNullable or x-isNullable

[eluchsinger]

What happened with this? @RicoSuter