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

# Overview

So far, we haven’t talked about how to fix the kind of errors that are triggered by strict null checks. The reason I haven't mentioned a non-null assertion operator is that you shouldn't be using it unless you have a very good reason to do so.

Non-null assertion operators are simply a way of telling the compiler, _trust me, I'm absolutely sure that this optional value is in fact never empty_. Syntactically, you can express this by postfixing the optional value with a `!` character.

This lesson introduces the non-null assertion operator and discuss when it is ok to use it.

Strict types

Generics

Composing types

Advanced types

TypeScript in practice

Conclusion

Non-Null Assertion Operator