On my site, I am giving an option to set the unique user name
it's unique so no same user name can be placed
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The document ID is the primary key. Once set it cannot be changed and a collection can have only 1 doc with same ID. Or you could reserve a field in the document itself to be used as one. – Dharmaraj Sep 13 '22 at 13:50
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If you [search for `[google-cloud-firestore] unique username`](https://stackoverflow.com/search?q=%5Bgoogle-cloud-firestore%5D+unique+username), you'll find this topic has been covered before. I recommend checking out those questions and answers, and trying to implement your use-case based on that. --- If you have more concrete problems after that, post a question with a [minimal repro](http://stackoverflow.com/help/mcve) of where you got stuck and it is more likely that someone can help. – Frank van Puffelen Sep 13 '22 at 13:51
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FILE 1 :--- let a ='No Data'; Function changeA(){ a='Value Of A Is Changed'; } chnageA(); alert(a); export{a}; FILE 2 :-- import {a} from 'File1 Path'; alert(a); – Raju Sep 23 '22 at 07:54