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

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