How to execute TypeScript file using command line?

TypeScript is an open-source programming language. It is developed and maintained by Microsoft. TypeScript follows JavaScript syntactically but adds more features to it. It is a superset of JavaScript. In order to execute or run any typescript file, first you need to install node and using it install typescript globally in your local system.

Syntax:

To check node is installed, run command if not you have to installed it first:
```
node -v
```
Now to install typescript, use:
```
npm install -g typescript
```

After installing typescript, create a .ts file, for example, greet.ts as given below:

Example:
var greet: string = "Greetings";

var geeks: string = "GeeksforGeeks";

console.log(greet + " from " + geeks);

// save the file as hello.ts
Output:
```
Greetings from GeeksforGeeks
```

Procedure 1: This typescript file greet.ts will create a javascript file at runtime with the same name. To run any typescript file there are a few ways:
Syntax:

Step 1: First, run the typescript file with the following command. This will create a javascript file from typescript automatically with the same name.
```
tsc helloWorld.ts
```
Step 2:Now run the javascript file, the greet.ts file will get executed:
```
node helloWorld.js
```

Procedure 2: You can merge both the commands by using a pole | and && like below :
Syntax:

In Windows:
```
tsc greet.ts | node greet.js
```
In Linux or MacOS:
```
tsc helloWorld.ts && node helloWorld.js
```

Procedure 3: You can also install ts-node along with typescript using the following command:

Syntax:

To install:
```
npm install -g ts-node
```
To run:
```
ts-node helloWorld.ts
```

Output: Using any of the three ways, the output will remain the same.

Greetings from GeeksforGeeks

Article Tags :

JavaScript

Web Technologies

TypeScript