Setting up the development environment for TypeScript

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...