Hi,

Right now I considering *incremental *migration of large ng1 application to 
ng2.

Idially, I would like to convert selected parts of the application, so they 
could benefit of Angular2 performance improvements (which should come from 
more efficient change tracking).

However, after reading documentation 
<https://angular.io/docs/ts/latest/guide/upgrade.html> I get confused:

When we downgrade an Angular 2 component and then use it from Angular 1, 
> the component's inputs will be watched using Angular 1 change detection.



So... supposing that I going to convert only several ng1 components to ng2, 
which going to be used by legacy ng1 components --> do or do not these 
converted components will use ng2 change tracking / have any ng2 
performance benefits?

Or, in order to have performance benefits i will be forced to upgrade the 
whole application?


Can anyone please clarify for me this point?


BTW: what is better -> upgrading "bottom->up" or in reverse direction?


Thanks!

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