Discover advanced TypeScript concepts: Gain insights into compiler flags, generic types, and discriminated unions. Delve into writing error-free code and mastering complex error messages with confidence.

typescript-3.7.5.tar.gz

TypeScript 3.7.5 Strict

TypeScript 3.7.5

Are you using TypeScript, but feel like you’re not making the most out of it? Do you find some advanced TypeScript concepts confusing? Do you get lost looking at complex type errors?

If you answered “yes” to any of these questions, then this course is for you! It introduces you to the world of advanced TypeScript concepts including: compiler flags for catching more errors, generic types, and how to compose types with discriminated unions. 

After finishing this course, you’ll feel more confident in your TypeScript skills. You will be able to write types that detect whole classes of possible runtime errors at compile time. Typing even the most untypeable JavaScript code will be a no brainer for you, and you’ll be fluent in TypeScript error messages.

Advanced TypeScript Masterclass

This is the most important chapter of this course. It will teach you how to create new types from existing types. 

First, we look at the most basic way of composing types with _union and intersection_ operations. Union types are ubiquitous in TypeScript so it's important to thoroughly understand them.

Second, we introduce the topic of _discriminated unions_. It's a powerful mechanism that can be used to express business rules in the type system. Next, we'll talk about _state machines_, a very useful state management technique that can be implemented using discriminated unions. Finally, we'll compare discriminated unions and _subtyping_ to see when to use which technique.

Strict types

Generics

Composing types

Advanced types

TypeScript in practice

Conclusion

Introduction