Angular: create is deprecated: use new Observable() instead

Pretty simple

this.data$ = new Observable((observer: Observer) => {
  observer.next();
  observer.complete();
});

Or you can use just

this.data$ = of(this.model);

In 2021 it is changed.

new Observable((observer: Observer<object>) => {
    observer.next(data);
});

instead of

new Observable((observer: Observer) => {
    observer.next();
    observer.complete();
});

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