React: Write Awesome Component API with Conditional Props and TypeScript

React: Write Awesome Component API with Conditional Props and TypeScript

React: Smart component API with conditional props and TypeScript. Using TypeScript and conditional props, you can build an API for your React components that is clear and explicit about prop requirements. This tutorial assumes you have a basic knowledge of TypeScript and types.

Using TypeScript and conditional props, you can build an API for your React components that is clear and explicit about its prop requirements. Doing so will help your team and will set you apart as a rock-star developer.

We will start with a simple use case, and we will finish up with a more advanced one that involves generics.

This tutorial assumes you have a basic knowledge of TypeScript and types.

One or the other

Imagine you have a component where you have two conflicting properties. You want the client to provide either one property or the other, but not both.

For our example, we will use an Avatar component that accepts either a URL string or a file object as a source. If the client provides the URL string, we do not want them to provide the file too, and vice-versa.

Here’s what the first iteration of your component might look like:

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