1. Install Node.js and npm

To run TypeScript, you must have Node.js and its package manager npm installed. Download: Go to https://nodejs.org and download the LTS version.Verify Installation:

Open your terminal and run:

node -v
npm -v

You should see the version numbers of Node.js and npm if everything is installed correctly.

2. Create a New Project Folder

Create a folder where you'll set up your TypeScript project:
mkdir my-ts-project
cd my-ts-project

3. Initialize Your Project with npm

Run the following command to generate a package.json file:

npm init -y
The -y flag automatically accepts all default values.

4. Install TypeScript

Install TypeScript as a development dependency:

npm install typescript --save-dev

5. Create TypeScript Configuration File

Generate the tsconfig.json file, which stores the configuration settings for the TypeScript compiler:

npx tsc --init
This will create a default config file. You can later customize it based on your project's needs.

6. Create Your First TypeScript File
Create a folder named src and add a file named index.ts inside it:

mkdir src
touch src/index.ts

Now, add the following code inside src/index.ts:

function greet(name: string): string {
returnHello, ${name}!;
}
console.log(greet("Joyonto"));

7. Compile TypeScript into JavaScript

To compile your TypeScript code, run:
npx tsc

This will compile your .ts file into a .js file. By default, it will create the compiled file in the same folder unless you specify an outDir in tsconfig.json.

Example:
src/index.ts → src/index.js

8. Run the Compiled JavaScript File

Now run your JavaScript file with Node.js:
node src/index.js

You should see the output:
Hello, Joyonto!

9. (Optional) Add Scripts to package.json

To simplify your workflow, you can add scripts to your package.json like this:

"scripts": {
"build": "tsc",
"start": "node src/index.js"
}

Now you can run:

npm run build # Compiles the TypeScript code
npm start # Runs the compiled JavaScript