TypeScript: Documentation - TypeScript 3.9

How To Use Generics in TypeScript

How to extend some class in ECMAScript 6 ? - GeeksforGeeks

TypeScript Extend Type How does TypeScript Extend Type work?

Getting started with TypeScript classes

Advanced TypeScript: How to Use Interface Inheritance With Discriminated Unions, by Jim Redfern

Flexiblly Extend Nested Structures - Trees that Grow in TypeScript - DEV Community

A Detailed Guide on TypeScript Pick Type

How to extend types in Typescript

TypeScript: Array generic, Custom generic type, Generic extends, Default values of Generics, Generic types with extends

Typescript - vscode-docs1