Check out example codes for "add typescript in node". It will help you in understanding the concepts better.

Code Example 1

// Follow the below steps and you good to go easily

// create a new folder and open a terminal on that folder and type below commands
	npm init-y

	yarn add -D @types/node typescript ts-node

	npx tsconfig.json                 

// open package.json and add in  scripts
    "start": "ts-node src/index.ts",
//	create new folder src/index.ts ..... open - index.ts
     console.log("Hello TypeScript");

//// And type below cmd for start....
	yarn start
//// DONE!!!!!!!

Learn ReactJs, React Native from