Gain insights into building strongly typed polymorphic React components using TypeScript. Learn about naive implementations, advanced use cases, and creating reusable utilities for design systems.

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TypeScript has become the de facto way to build modern web applications. With the rise of design systems and reusable components, building strongly typed polymorphic components is a desirable skill for the modern web engineer. 

This course provides a bottom-up approach to building strongly typed polymorphic components. You will start with a naive implementation of a polymorphic component and explore its drawbacks. You will then use TypeScript to provide a production-ready component interface. Finally, you’ll support advanced use cases with component refs and build a reusable utility you can use on multiple components. 

By the end of the course, you’ll be ready to build components fit for a design system and go beyond basic reusable needs.

Using TypeScript for Building Polymorphic React Components

A component that only accepts a specific type of prop

A component that can only render a single type of component

A component that can render different types of elements based on its props

A component that only accepts a single prop

What is a polymorphic component in React?

What is a polymorphic component in React?

It makes code more flexible and maintainable.

What is the primary reason for using polymorphic components in React?


What is the primary reason for using polymorphic components in React?

How do you declare a generic type in TypeScript?

How do you declare a generic type in TypeScript?

What is the primary reason for using generics in TypeScript?

What is the primary reason for using generics in TypeScript?

We can't define the element attribute types based on a polymorphic prop.

We can leverage the `React.ComponentPropsWithRef` or `React.ComponentPropsWithoutRef` type.


How do you get the correct element attribute types based on a polymorphic component prop? 

How do you get the correct element attribute types based on a polymorphic component prop?

Take a quiz on building strongly typed polymorphic components with TypeScript. 

Introduction

Strongly Typed Polymorphic Components

Build a Reusable Polymorphic Type Utility

Polymorphic Component with Ref Support

Exercise and Conclusion

Quiz