The article
Node.js, Dependency Injection, Layered Architecture, and TDD: A Practical Example, Part 1
by @Carlos González
gives a very good introduction of how to structure a (TypeScript/JavaScript) app. He links articles that allow one to dive deeper into underlying concepts and still explains the big picture very well. Great job Carlos!
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Looking around for resource for JavaScript developers that get into TypeScript I found this
TypeScript for JavaScript Programmers
in the TypeScript handbook.
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TypeScript 3.9 was released. Since I am basically a fan of making code safer and better to understand, that's what I use types for, I see nothing interesting to me in this release. But I also use TypeScript in a much simpler way than the cracks and fans.
https://devblogs.microsoft.com/typescript/announcing-typescript-3-9/
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You don't need to rename all your ".js" files to ".ts" to go all in on TypeScript, you can go gradually. Adopt TypeScript step by step, become familiar with it in your existing JavaScript project. No need to put development on hold for weeks, while you convert the code base to TypeScript and fix all type errors. Read on to see how I adopt TypeScript for JavaScript for the sourcecode of jskatas.org.