import { AnimationTriggerMetadata, trigger, state, style, animate, transition } from '@angular/animations'; export const dropAnimation: AnimationTriggerMetadata = trigger( 'dropAnimation', [ state('active', style({ 'height': '*', })), state('inactive', style({ 'height': '0', 'overflow': 'hidden' })), transition('active<=>inactive', animate(`.35s ease`)), ]);