Installing & Using TypeScript.md

Installing & Using TypeScript

To install and use TypeScript, you can follow these steps:

Installation:

1. Install Node.js:
   • TypeScript requires Node.js and npm (Node Package Manager). You can download and install them from the official website: Node.js
2. Install TypeScript globally:

   • Open your terminal or command prompt and run the following command to install TypeScript globally: This command installs the TypeScript compiler globally on your machine.

     npm install -g typescript

Using TypeScript:

1. Create a TypeScript File:

   • Create a new file with a .ts extension. For example, app.ts.

2. Write TypeScript Code:

   • Write your TypeScript code in the .ts file. TypeScript supports JavaScript syntax along with additional features. For example:

     // app.ts
     function greeter(person: string) {
         return "Hello, " + person;
     }
     
     let user = "John";
     console.log(greeter(user));

3. Compile TypeScript Code:

   • Compile the TypeScript code into JavaScript using the TypeScript compiler. Run the following command in the terminal: This command generates a corresponding .js file. In this case, app.js.

     tsc app.ts

4. Run the JavaScript Code:

   • You can now run the generated JavaScript code using Node.js. For example: This will execute the JavaScript code produced by the TypeScript compiler.

     node app.js

Configuration (Optional):

• You can create a tsconfig.json file in your project to configure TypeScript settings. This file allows you to specify compiler options, include/exclude files, and more. Here's a basic example:

  {
    "compilerOptions": {
      "target": "es5",
      "module": "commonjs",
      "strict": true
    }
  }

• After creating a tsconfig.json file, you can compile your TypeScript code by simply running tsc in the terminal. The compiler will use the configuration settings defined in tsconfig.json.

That's it! You've successfully installed TypeScript and created a simple TypeScript project. You can now continue writing and compiling TypeScript code based on your project needs.