TypeScript makes alluring promises regarding one's development experience. Why not fiddle with the code to see it in practice? First, we have to create a dedicated directory for upcoming samples. We initialize the project by running npm init -y and install typescript as a dev dependency:

npm i -D typescript

In the manifest scripts section, we add a command to compile sources with TypeScript:

package.json

{ 
... 
"scripts": { 
    "build": "tsc" 
  }, 
... 
} 

We need to let TypeScript know what exactly we want from it. We will describe that in the configuration file:

tsconfig.json

{ 
  "compilerOptions": { 
    "target": "ES6", 
    "module": "CommonJS", 
    "moduleResolution": "node", 
    "sourceMap": true...