RXJS进口表现

Question

导入时有最佳做法吗？

一种方式比另一方好吗？

import { mergeMap, merge, withLatestFrom, map } from 'rxjs/operators';

//or

import { mergeMap } from 'rxjs/operators/mergeMap';
import { merge } from 'rxjs/operators/merge';
import { withLatestFrom } from 'rxjs/operators/withLatestFrom';
import { map } from 'rxjs/operators/map';