Extends a Class will make losing and corrupted types in a child class. · Issue #42541 · microsoft/TypeScript · GitHub

When we add types on properties base class, if a child class extends this base class, we will lost types and get corrupted behavior. Actually is seem affected by keyof T, i not tested all others types, but this one make coruptions. From

class MyArray extends Array broken in Typescript 2.1.5 · Issue #13720 · microsoft/TypeScript · GitHub

5.1 regression from 5.0: JavaScript heap out of memory (Type instantiation is excessively deep and possibly infinit) · Issue #54542 · microsoft/ TypeScript · GitHub

TSC2417 - Incorrectly extending other class (which is not the case) · Issue #18643 · microsoft/TypeScript · GitHub