# How to Run Typescript Files from Command Line in node.js?

To run TypeScript files from the command line in Node.js, you need to transpile the TypeScript code to JavaScript first, and then execute the generated JavaScript file using Node.js. Here are the steps:

1. Install TypeScript
If you haven't installed TypeScript globally, you can do so using the following command:
    
    ```bash
    npm install -g typescript
    ```
    
2. Write TypeScript Code
Create a TypeScript file (e.g., `example.ts`) with your TypeScript code. For example:
    
    ```tsx
    // example.ts
    const greeting: string = 'Hello, TypeScript!';
    console.log(greeting);
    ```
    
3. Transpile TypeScript to JavaScript
Use the `tsc` command (TypeScript Compiler) to transpile the TypeScript code into JavaScript. Run this command in the same directory as your TypeScript file:
    
    ```bash
    tsc example.ts
    ```
    
    This will generate a JavaScript file (`example.js`) based on your TypeScript code.
    
4. Run JavaScript File
Now, you can run the generated JavaScript file using Node.js:
    
    ```bash
    node example.js
    ```
    
    This will execute the JavaScript code generated from your TypeScript file.
    

## Optional: Use ts-node for Direct Execution without Transpilation

If you prefer to skip the separate transpilation step, you can use `ts-node` to directly run TypeScript files. First, install `ts-node` globally:

```bash
npm install -g ts-node
```

Then, you can run your TypeScript file directly:

```bash
ts-node example.ts
```

`ts-node` internally handles the transpilation and execution of TypeScript files, making it convenient for development and scripting. However, note that it might have a slight runtime performance overhead compared to pre-transpiling your TypeScript code.