Guide to Using Typescript with React

Guide to Using Typescript with React

TypeScript is a statically typed superset of JavaScript that adds several benefits to building using React. Static type checking is provided, which aids in the detection of bugs and enhances the quality of the code throughout the development process.

TypeScript improves code maintainability by facilitating enhanced documentation, refactoring, and teamwork. Some helpful features include automatic code completion, in-line help, and highlighted errors. TypeScript developers can design clean contracts and interfaces for their modules, leading to greater scalability.

Advantages of Using TypeScript with React

The advantages of TypeScript with React are amplified when used together. With TypeScript’s built-in support for strong typing, developers can produce more dependable code. Improvements in code structure, refactoring options, and React-specific tools contribute to a more pleasant working experience. 

Runtime mistakes may be minimized because of TypeScript’s static type checking, performed during the development process but not at runtime. Further, while developing with React, TypeScript allows easy interaction with other TypeScript-based libraries and ecosystems, leading to faster, more scalable development.

1 Setting Up a TypeScript Project with React   

Creating a New React Project

Use Create React App (CRA) or a similar tool to start a new React project. To construct a new React project with the required dependencies, use the command `npx create-react-app my-app.`

Adding TypeScript to the Project

Install TypeScript and the React and ReactDOM type definitions by running `npm install –save typescript @types/react @types/react-dom after creating the React project.

Configuring TypeScript

Create a `tsconfig.json` file and place it in your project’s main folder. Modify this file to fit your project’s requirements by providing the target version, module resolution, and other TypeScript compiler parameters.

2 Writing Components with TypeScript         

Type Annotations for Props and State

Define the kinds of your React components’ props and states using TypeScript type annotations. This allows the TypeScript compiler to do type-checking and offers clarity on the desired data structure.

Handling Events and Event Handlers

TypeScript allows you to define events and the methods that should be invoked in response to them. Doing so eliminates the possibility of runtime errors and guarantees that event handlers always get the proper event object.

Working with Refs

React relies on the TypeScript `RefObject` type for managing references. References to DOM nodes or React components may now be created safely using type annotations.

Hooks and Function Components

You can use hooks and function components in TypeScript. Parameters and return values of themes should be defined for correct use and type safety.

Type Checking React Context

Type-safe access to context values within components requires defining the kinds of context data used by React.

3 Working with React and TypeScript Ecosystem

Using React Router with TypeScript

React Router supports TypeScript and includes definitions for its supported types. To guarantee type safety and precise routing in your React apps, specify types for route parameters, query strings, and route components in TypeScript.

Integrating Redux with TypeScript

Redux is well-supported in TypeScript. To guarantee type correctness and identify mistakes early on, it is essential to provide type-safe actions, reducers, and application states.

Working with Styled Components

TypeScript is fully compatible with Styled Components. To avoid making any mistakes while styling your React components, you should define types for the properties used to apply the styles.

Testing React Components with TypeScript

Using TypeScript, testing React components is simplified. Use TypeScript’s type checking to write type-safe tests that verify that details are given valid arguments and provide the desired results.

4 Advanced TypeScript Techniques for React       

Creating Custom Hooks with TypeScript

TypeScript makes it easy to build reusable custom hooks by allowing you to specify a type for each parameter and result. As a result, your React components will be more reusable and type-safe.

Using Generics with React Components

Using generics in TypeScript, you can build React components that are both versatile and type-safe, allowing you to interact with a wide variety of data types. As a result, code may be reused, and type verification may be improved.

Type-Safe Forms with Formik and Yup

Use TypeScript with the Formik and Yup libraries to build completely type-safe forms. Type-check form submissions and define validation schemas to guarantee the correctness of form input.

Writing Higher-Order Components with TypeScript

Higher-order components (HOCs) benefit from TypeScript’s type definition features, which may be used to specify input and output types. This ensures that HOCs in React apps have enough composition and type safety.

5 Best Practices and Tips          

Naming Conventions for TypeScript in React

TypeScript’s naming standards will help keep your code consistent and readable. Make your code easier to read using the proper case for components, properties, and constants.

Avoiding Any Type and Using Unknown Instead

To ensure type safety, the `unknown` type should be used instead of `any` other kind. `unknown` necessitates more stringent type checking, which aids in finding possible mistakes.

Using a Non-Null Assertion Operator (!)

In cases when you know for sure that a value won’t be null or undefined, use the non-null assertion operator (! ). Take care while using it so that no runtime issues occur.

Enforcing Strict Null Checking

Enabling tight null checking in the TypeScript setup may help developers see probable null or undefined values early on, making for more reliable code.

Working with Third-Party Libraries and TypeScript Definitions

Check whether the external libraries you want to utilize include TypeScript support or type definitions (`@types` packages). Your React applications may benefit from comprehensive type-checking and editing support for the libraries above.

6 Debugging and Troubleshooting        

Common TypeScript and React Errors

Learn to recognize typical error messages in both TypeScript with React. Incorrect use of hooks, undefined variables, missing props, and so on are all examples.

Debugging TypeScript Code in the Browser

To debug transpile code in the browser, have TypeScript generate source maps during compilation. Source mappings connect the JavaScript code to its corresponding TypeScript source to facilitate debugging.

Using ESLint and TSLint for Code Quality

Set up either ESLint or TSLint to inspect your TypeScript code for mistakes and recommend improvements. Code quality may be improved with the help of linting tools since they can find problems before they become major headaches.

7 TypeScript Tooling for React  

IDE Support and Extensions

Use integrated development environments (IDEs) like Visual Studio Code, which provide first-rate TypeScript and React support. Autocompletion, code navigation, and error highlighting are just a few ways installing the appropriate extensions may improve the programming experience.

Type Definitions and DefinitelyTyped

Use DefinitelyTyped to get TypeScript type definitions for external libraries. Type checking and improved interaction with React and its ecosystem are enabled by installing type definitions (`@types` packages).

TypeScript Compiler Options

Change the settings in `tsconfig.json` to build TypeScript how you want it to. You may optimize your React with TypeScript project by adjusting the target version and module resolution options.

8 Migrating Existing React Projects to TypeScript   

Strategies for Incremental Migration

Adopt a phased migration strategy by replacing JavaScript with TypeScript files over time. Update to TypeScript in stages, beginning with the most important parts or upcoming features. This allows for less upheaval and a smoother changeover.

Handling Third-Party Libraries and Type Declarations

Verify that TypeScript is supported by, or type declarations are accessible for, any external libraries used in your project. If type safety is essential while utilizing those libraries, you should make your type declarations or contribute to the DefinitelyTyped repository.

Dealing with Legacy Code

The transition to TypeScript necessitates refactoring and updating existing code. Focus first on the most crucial parts of the code or the most often updated ones. Refactoring may improve the type of safety and maintainability of outdated code.


Combining TypeScript with React significantly enhances the development procedure. Static type checking in TypeScript raises the code’s quality and helps catch errors early. 

Through improved documentation and refactoring features, it makes code more easily maintained and facilitates teamwork. The best reactjs development services may take advantage of autocompletion, error checking, and increased productivity thanks to TypeScript’s tools support. 

Developers may create dependable and type-safe React components by adhering to best practices and using advanced approaches like building custom hooks and leveraging generics. Additionally, TypeScript’s compatibility with the most used React frameworks and tools is effortless. With TypeScript’s help, developers can build React apps that are more robust, scalable, and easy to maintain.

Author Bio:

Atman Rathod is the Co-founder at CMARIX TechnoLabs Pvt. Ltd., a leading web and mobile app development company with 16+ years of experience. He loves to write about technology, startups, entrepreneurship and business. His creative abilities, academic track record and leadership skills made him one of the key industry influencers as well.