Step1 - Init ts.config file

 npm install -g typescript #required only first time
 tsc --init

Step2 - Update ts.config file

"rootDir": "./src", /* Specify the root folder within your source files. */
"outDir": "./dist", /* Specify an output folder for all emitted files. */

Step3 - Write TS code

Create src/index.ts

const myName:string = "Dhananjay"
console.log(myName)

Step4 - Execute

tsc -b #to build the code
node ./dist/index.js #to run the executed file

Every time when index.ts file is modified, step4 is needed to exec the file

If you want to rebuild the code every time you save the code

npm init -y
npm i tsc-watch -D #installing as dev dependency

"scripts": {
  "dev": "tsc-watch --onSuccess \"node ./dist/index.js\""
}