To stay or to leave?

So the situation is the following. Took a job as a web developer for react. Of course I love react, redux, love the flow, jest and use other libraries from facebook.
It would seem everything is fine.
But! Come in today to get a job, and most importantly after registration of all papers, I claim that the project will be of angular 5, and I have to start to learn angular. To put it mildly I was taken aback. No, something new to teach I am always happy, but after investing so much effort in the ecosystem of facebook-and I would not like to drastically switch to google, but at least to perform a couple of any complete projects.
Question. What to do at all?
1. to stay and learn angular, the advantage is acquiring new knowledge
2. to take the docks and find another job, as even such an attitude that very important detail just hid already raises doubts
June 7th 19 at 14:57
4 answers
June 7th 19 at 14:59
To learn a new technology at the expense of others is pretty tempting, in my opinion.
June 7th 19 at 15:01
Better to stay at least for a trial period.

Perhaps you have dreamed about Angular, just do not understand.
Perhaps the company will be so good that you will not care — in which the ecosystem to work.

If after a couple weeks you will continue to doubt — parallel search for a new job. Just one Friday, gone with the old, and on Monday will reach a new.

Well, Yes — new knowledge will not hurt. At least as memories. And insignias Angular in summary — this is a definite plus.
June 7th 19 at 15:03
1 - change the tags of the question)

I would have stayed, would have looked like in General to work in the company. Because I live in this terrible situation there, you primarily as a frontend take.
If well-built workflows that a normal atmosphere, ... I would teach Angular . Well it's not jquery )
If you work in this company do not like - calmly change
June 7th 19 at 15:05
Having sufficient experience in the ecosystem and generally React in frontend, I don't think it will be extremely difficult to learn something new. I had a similar case, only about angular found out a couple months later, just after receiving the project. Suggest to learn angular for others, insignias will only be a plus, at the same time will be able to further employment request lots of gold. To change the galley will always have time, while at the same time learn angular, let's see how the situation on the deck.

PS 5 is not Angular Angularjs, so that everything is very good)

Find more questions by tags ReactRedux