template-no-negated-async.md

Pattern: Use of negated async

Issue: -

Description

Angular’s async pipes emit null initially, prior to the observable emitting any values, or the promise resolving. This can cause negations, like *ngIf="!(myConditional | async)" to thrash the layout and cause expensive side-effects like firing off XHR requests for a component which should not be shown.

Further Reading

• TSLint - template-no-negated-async