Transpiling
Learn TypeScript and transpile code into JavaScript for JS-only environments, and understand the fundamentals of the transpilation process.
"Hello TypeScript"
When we run a TypeScript file, the TypeScript compiler is responsible for transpiling it into a corresponding JavaScript file. This process is known as transpiling, allowing us to run our TypeScript code in environments that only support JavaScript, such as a web browser or a Node server.
You might be wondering, where is this JavaScript file that’s being generated? We won’t see it in the code editor—it’s happening behind the scenes. But don’t worry; we’ll take a closer look at the transpiling process in a moment.
For now, let’s just run this simple Hello TypeScript program and see what happens. Go ahead and press the “Run” button to see the output of the following code.
console.log(`Hello TypeScript`);
Congratulations, you’ve just run your first TypeScript program! As you can see, the program executed exactly as expected, printing the message Hello TypeScript to the console.
In the next step, we’ll take a closer look at the transpiling process and learn how to configure the TypeScript compiler to suit our needs. But for now, let’s savor the moment and congratulate ourselves on a job well done!
Transpiling process
Are you ready to unleash the power of the TypeScript compiler? Great, because it’s time to learn how to transpile a TypeScript file using the tsc command! Take a look at the directory in the terminal below by running the ls command—can you spot the hello_typescript.ts file?
Now that we have our hello_typescript.ts file ready to go, it’s time to transpile it into JavaScript using the tsc command. To transpile the hello_typescript.ts file using tsc, run the following command in the terminal above:
tsc hello_typescript.ts
This will generate a ...