How to split a large angular file into many files while still staying in the same class?

Question

Angular

There are partial classes in c# and you can keep a lot of data in one class, which will be in different files.
Why don't I want to create subclasses and nest them? - then it will be difficult to interact in a top-down hierarchy. And in Typescript and Angular, I did not find such a way to split a huge file into parts as if all the methods were in one place.
Please tell me how to implement this?

Answer 1

For something like this, you can use mixins, with the help of some thread or directly .
It's not exactly crutches, but there is nothing better.