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

The code below compiles with the `strict` flag set to `false`. Adjust it so that it compiles when `strict` is set to `true` as well.

After you have resolved all compiler errors, can you spot some other issues with the code? Can it still throw runtime errors?

_Note that the system can only verify that your code compiles without errors. To check your solution, click on **Show solution** and compare the code._

Strict types

Generics

Composing types

Advanced types

TypeScript in practice

Conclusion

Exercise in Strictness