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TypeScript in Depth · Typing React · Lesson 11 of 16

Typing Props

Concept

Typing Props

Define an interface for a component's props so TypeScript checks every usage of that component.

By the end of this lesson
  • Explain the core idea behind Typing Props.
  • Predict output before running a change.
  • Test one realistic and one unusual input.
  • Use the result to make the next decision.
How to study this page
  1. 1. Read one concept.
  2. 2. Change the example.
  3. 3. Run, compare, and explain.
  4. 4. Complete the challenge below.
ExampleRunnable
interface ButtonProps {
  label: string;
  onClick: () => void;
}
function Button({ label, onClick }: ButtonProps) {}
Try it Yourself »
Self-check before continuing

Without looking at the example, describe what changes when you modify one input in Typing Props. Then reopen the editor and prove your explanation with a small test.

You are ready to continue when you can predict, test, and explain the result.

Your turn

Define props for a Card component with a title and an optional description.

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Console

Output will appear here...