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

Type 'K' is not assignable to type 'V (extends K)' · Issue #29397 · microsoft/TypeScript · GitHub

true extends false · Issue #28654 · microsoft/TypeScript · GitHub

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

Getting recursive type errors with TS 4.3.2 when they don't happen with TS 4.2.4 · Issue #44281 · microsoft/TypeScript · GitHub

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

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

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

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

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

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

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