TypeScript handbook (opens in a new tab)
The official reference for the tools used in this lesson.
Link
Typing external data at the boundary
Data from the network is unknown until you prove otherwise. A runtime schema validates it once and gives you a static type for free.
Lesson 4.27m 14sIntermediate10.7k students
Chapters
7:14What this lesson covers
- Parse unknown input instead of casting it
- Derive a static type from a runtime schema
- Fail loudly at the boundary rather than deep inside
This lesson sits in TypeScript in Practice, part of TypeScript for Application Developers. It assumes what came before it and leads directly into the next lesson in the module.
In this lesson you will
- Parse unknown input instead of casting it
- Derive a static type from a runtime schema
- Fail loudly at the boundary rather than deep inside
Resources
Zod documentation (opens in a new tab)
Schema definition, parsing, and type inference.
Link
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