TypeScript: Documentation - TypeScript 3.9

TypeScript Extend Type How does TypeScript Extend Type work?

Cannot extend class using Typescript - Stack Overflow

The Mixin Pattern In TypeScript – All You Need To Know Part 2

Getting started with TypeScript classes

Type System Features - CodeProject

TypeScript's Powerful Type Inference with Conditional Types and

How to extend types in Typescript

Typescript - vscode-docs1

TypeScript: What is the difference between type and interface?, by Andrew Courter

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