import { BehaviorSubject } from "rxjs/BehaviorSubject";

const subject = new BehaviorSubject<number>(1);
console.log(subject.value);
                    ~~~~~                               [no-subject-value]
console.log(subject.getValue());
                    ~~~~~~~~                            [no-subject-value]

[no-subject-value]: Accessing the value property of a BehaviorSubject is forbidden