'Interface for angular animations with parameters/variables

Everywhere I find articles with examples of how to use animations with parameters:

So far so good. But what I can't find is. What is the name of that interface?

e.g. [@leavingTowardsTop]="{value: ':leave', params : {topPixels: '-300px'}}" (link to the post)

Also I checked already the docs https://angular.io/api/animations. Can't find anything.



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