Changing the File Extension
We can start with a really simple and easy step by just changing your file extension from .js or .jsx to .ts or .tsx (if the file contains JSX). This will indicate your development environment in that you are working with TypeScript code.
Defining Your Types
In typescript, we have to declare variable types, function parameters, and return values. This is one of the major benefits of TypeScript as it allows type-checking at the compile time.
With this feature, we can intercept and rectify many common errors before deploying the code into a production environment.
While converting it into TypeScript, we would specify that name should always be a string:
This prevents any unexpected errors and gives greater control over our code.
Transforming PropTypes to TypeScript Interfaces
Now let’s transform this into TypeScript using interfaces:
Note: – We can also use optional chaining in using interfaces. e.g;
For instance, when creating a functional component, we can define the types of props and states as follows:
Install Type Definitions
Using Strict Mode
To ensure the highest level of type safety, it is recommended to enable the strict mode to true in your tsconfig.json file. This forces the compiler to perform more rigorous checks, catching potential issues that might otherwise be missed.
Adopt TypeScript Gradually
Compile and Fix Type Errors
After making the necessary changes to the codebase, we need to run the TypeScript compiler (tsc). This will help us in identifying any further issues or type errors in our project.