• Run sudo npm i -g typescript to install typescript globally.
• Check typescripe version by running tsc --version to make sure you installed it correctly.

• Create a file called app.ts touch app.ts
• Write typescript code in it.
• To compile it run tsc app.ts. It will generate actual Javascript file for app.js.
• If you want to watch your ts file everytime when changes happen, run tsc app.ts -w.

• Create a typescript config file by running tsc --init. This will generate a tsconfig.json file with commented options.
• Make the "target" to es2016
• Uncomment "outDir": "./" and "rootDir": "./".
• Add ./dist to outDir. "outDir": "./dist": It will add the compiled js files into dist folder.
• Add ./src to rootDir. "rootDir": "./src": It will specify the root directory of input files.
• Make sure to uncomment the "moduleResolution": "node"

• Now move the app.ts file into src folder.
• Simple run tsc in project directory to automatically create dist folder and add the compiled version of app.ts.

• Add package.json file by running npm init -y.
• Install express: npm i express.
• Run npm i -D typescript ts-node nodemon @types/node @types/express to install typescript, ts-node, nodemon, types definition of node and express as Dev dependencies.

Add Below as Scripts in package.json file

• "start":"node dist/app.js",
• "dev": "nodemon src/app.ts",
• "build": "tsc -p ."