TypeScript for Application Developers

What you’ll learn

• Make invalid states unrepresentable

  Model your domain so the compiler rejects the combinations that should never happen.

• Write real generics

  Build reusable functions and components that keep type information instead of erasing it.

• Use the type-level toolkit

  Apply conditional, mapped, and template literal types where they earn their complexity.

• Type the boundaries

  Validate and type the data crossing into your app, so external data stops being an any.

1. 1How the Type System ThinksThe mental model underneath everything else: structural compatibility, unions, and narrowing.27m 47s

   1. Lesson 1.11.1Structural typing and assignabilityFree preview
      11m 49s
   2. Lesson 1.21.2Unions and narrowing
      10m 20s
   3. Lesson 1.31.3Literal types and const assertions
      5m 38s
2. 2GenericsWriting code that keeps type information flowing through it instead of collapsing to any.23m 52s

   1. Lesson 2.12.1Generic functions and inference
      12m 52s
   2. Lesson 2.22.2Constraints and default type parameters
      4m 13s
   3. Lesson 2.32.3Generic components in React
      6m 47s
3. 3Advanced TypesThe type-level features that let a type be computed from another type, and the judgement to use them sparingly.40m 23s

   1. Lesson 3.13.1Conditional types and infer
      14m 23s
   2. Lesson 3.23.2Mapped types and key remapping
      6m 49s
   3. Lesson 3.33.3Template literal types
      19m 11s
4. 4TypeScript in PracticeConfiguration, external data, and the places typed code meets the untyped world.22m 56s

   1. Lesson 4.14.1tsconfig and strictness settings
      9m 53s
   2. Lesson 4.24.2Typing external data at the boundary
      7m 14s
   3. Lesson 4.34.3Declaration files and untyped packages
      5m 49s