message: test(dtslint): add dtslint test for from static function
diff: -import { from, of, asyncScheduler } from 'rxjs';
  +import { from, of, animationFrameScheduler } from 'rxjs';
  it('should accept an array', () => {
  const o = from([1, 2, 3, 4]); // $ExpectType Observable<number>
  @@ -43,3 +43,7 @@ it('should accept an array of Inputs', () => {
  const o = from([of(1), ['test'], iterable]); // $ExpectType Observable<IterableIterator<number> | Observable<number> | string[]>
  });
  +
  +it('should support scheduler', () => {
  + const a = from([1, 2, 3], animationFrameScheduler); // $ExpectType Observable<number>
  +});
  