LEVEL 6 · TYPESCRIPT

Course Advanced

Advanced TypeScript

The type system in depth: type operators, utility, mapped, conditional and template literal types, inference, variance and branded types, then type-safe events, CQRS and dependency injection, decorators, declaration files, packages, monorepos, type-level tests and compiler performance.

  • 1 lessons
  • 45 min to read and try
  • Before this: TypeScript

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When you finish, you can

  • Derive types from values and other types with keyof, typeof and indexed access
  • Write mapped, conditional and template literal types, using infer
  • Choose between as, satisfies and as const
  • Model a domain with branded types and discriminated unions
  • Build type-safe event, command and dependency injection infrastructure
  • Write declaration files and publish a typed package
  • Test types, and keep a large project fast to compile

You build: A typed event bus, a typed dependency injection container and a typed command bus

MODULE 1

Type operators

  1. 1Advanced and utility typesBuild new types from existing ones with keyof, typeof, indexed access, mapped, conditional and template literal types, and use the built-in utility types (Partial, Pick, Omit, Record, ReturnType, Awaited and more) to keep one source of truth.45 min

Course checkpoint

Prove you can move on. The checkpoint picks 5 questions at random from every lesson in this course. Get 4 right to pass. Your result is saved in this browser only.