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

# `Partial`

`Partial<T>` returns a type that has the same properties as `T` but all of them are optional. This is most useful when the `strictNullChecks` flag is enabled. `Partial` works on a single level, meaning it doesn't affect nested objects. A good use case for `Partial` is when you need to type a function that lets you override default values of properties of some object.

As you can see, `Partial` is defined in a similar way to `Readonly`. Instead of the `readonly` modifier, the optionality modifier `?` is appended to each property of `T`.

This lesson walks through some of the built-in mapped types and explains them in detail.

Strict types

Generics

Composing types

Advanced types

TypeScript in practice

Conclusion

Built-in Mapped Types

`Partial`