What does it do?

It serves the purpose of adding Animation Events to runtime animations in Unity.

Example usage:

private Animator _animator;
    private void Awake()
    {
        _animator = GetComponent<Animator>();
    }

    private IEnumerator Start()
    {
        _animator.AddAnimationEvent("Move",0.15f,Test);
        _animator.AddAnimationEventByStateName("MoveTest",1f,TestTwo);
        _animator.AddAnimationEventNormalizedTime("Move",0.5f,TestThree);
        
        _animator.AddAnimationEventNormalizedTimeByStateName("MoveTest",0.5f,()=>
        {
            Debug.Log("Test NormalizedTime ClipSearchType.ByStateName");
        });
        
        _animator.AddAnimationEvent("Move",0.3f,TestStatic);
        yield return new WaitForSeconds(3f);
        _animator.RemoveAnimationEvent(Test,0.15f);
    }
    
    private void Test()
    {
        Debug.Log("Test");
    }
    
    private void TestTwo()
    {
        Debug.Log("Test ClipSearchType.ByStateName");
    }
    
    private void TestThree()
    {
        Debug.Log("Test NormalizedTime");
    }

    private static void TestStatic()
    {
        Debug.Log("Test Static Event");
    }

You can use NormalizedTime when setting the animation time. (AddAnimationEventNormalizedTime)

You can use Clip name or state name if you want. For this, you can set ClipSearchType according to yourself.

public static void AddAnimationEvent(this Animator animator, string clipName, float time, Action action,ClipSearchType clipSearchType = ClipSearchType.ByClipName)

You can also see the active events on the inspector.

if you want a remove event you can use the method

 _animator.RemoveAnimationEvent(Test,0.15f);