animations: [ trigger('triggerName'), [ state('states Name', style()) transition('state Change Expression', [Animation Steps]) ] ] code example

Example: angular transition animation

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      animations: [
  trigger('openClose', [
    state('true', style({ height: '*' })),
    state('false', style({ height: '0px' })),
    transition('false <=> true', animate(500))
  ])
],