ERROR Error: Uncaught (in promise): TypeError: i.BehaviorSubject is not a constructor in Angular 10 SSR

I just updated my project to Angular 10 and started facing this issue. What i did was , wherever I had BehaviorSubject imports , i changed them from import { BehaviorSubject } from "rxjs/Rx"; to import { BehaviorSubject } from "rxjs";

This makes production build work without any error.

I got solution, use rxjs-tslint and migrate all rxjs syntax : https://www.npmjs.com/package/rxjs-tslint