RXJS imports performance

Is there any best practice when importing?

Is one way better than the other?


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';

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