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

Using method type of derived class in base class · Issue #55827 · microsoft/ TypeScript · GitHub

Broken inferred recursive types · Issue #43817 · 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

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

Inherited typing for class property initializers · Issue #10570 · microsoft/ TypeScript · GitHub

Support override keyword on class methods · Issue #2000 · microsoft/ TypeScript · GitHub

Support final classes (non-subclassable) · Issue #8306 · microsoft/ TypeScript · GitHub

Support override keyword on class methods · Issue #2000 · microsoft/ TypeScript · GitHub

Module not found when extending a class otherwise same code without extending no error · Issue #51260 · microsoft/TypeScript · GitHub

Support override keyword on class methods · Issue #2000 · microsoft/ TypeScript · GitHub

Broken inferred recursive types · Issue #43817 · microsoft/TypeScript · GitHub

type inferrence with override methods in child class · Issue #31470 · microsoft/TypeScript · GitHub

Support override keyword on class methods · Issue #2000 · microsoft/ TypeScript · GitHub

Support final classes (non-subclassable) · Issue #8306 · microsoft/ TypeScript · GitHub