Typescript: The extends keyword

Typescript is a complete language (a Turing complete language ); thus, it has a few keywords to work with. One of that keywords is `extends`. It can be very confusing since it encompasses a couple of concepts or meanings that depend on the context where it is used.

Advanced TypeScript: The Power and Limitations of Conditional Types and the “infer” Keyword, by Kevin B. Greene

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Feature Request: extends oneof generic constraint; allows for narrowing type parameters · Issue #27808 · microsoft/TypeScript · GitHub

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10 Things You Need To Know About TypeScript Classes, by Bytefer

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Use 'extends' keyword to narrow the value of a generic

Building Complex Types in TypeScript, by Chris Barbour