Running your first TypeScript program using Visual Studio Code (VS Code) involves several steps. Here’s a step-by-step guide:
### 1. Install Node.js and npm
Ensure you have Node.js and npm (Node Package Manager) installed. You can download and install them from [nodejs.org](https://nodejs.org/). To verify the installation, open a terminal and run:
```bash
node -v
npm -v
```
### 2. Install TypeScript
Install TypeScript globally using npm:
```bash
npm install -g typescript
```
Verify the installation:
```bash
tsc -v
```
### 3. Set Up Your Project
Create a new folder for your TypeScript project. Open this folder in VS Code.
### 4. Initialize npm
Initialize a new Node.js project by running:
```bash
npm init -y
```
This will create a `package.json` file.
### 5. Create a tsconfig.json File
Generate a `tsconfig.json` file to configure the TypeScript compiler:
```bash
tsc --init
```
This command creates a `tsconfig.json` file with default settings.
### 6. Write Your TypeScript Code
Create a new file with a `.ts` extension, for example `app.ts`, and write your TypeScript code. Here's a simple example:
```typescript
function greet(name: string): string {
return `Hello, ${name}!`;
}
const user = 'World';
console.log(greet(user));
```
### 7. Compile TypeScript Code
Compile your TypeScript code to JavaScript. Run the following command in the terminal:
```bash
tsc
```
This command compiles all `.ts` files in the project based on the configuration in `tsconfig.json`. It generates corresponding `.js` files.
### 8. Run the JavaScript File
Run the compiled JavaScript file using Node.js:
```bash
node app.js
```
### Summary of Commands
1. Install TypeScript globally:
```bash
npm install -g typescript
```
2. Create a new folder and open it in VS Code:
```bash
mkdir my-typescript-project
cd my-typescript-project
code .
```
3. Initialize npm and TypeScript configuration:
```bash
npm init -y
tsc --init
```
4. Create and write TypeScript code in `app.ts`.
5. Compile the TypeScript code:
```bash
tsc
```
6. Run the compiled JavaScript code:
```bash
node app.js
```
By following these steps, you should be able to run your first TypeScript program using Visual Studio Code.
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