Setup Node with Typescript and eslint

• Create an empty directory for your project and move in it.

mkdir project
cd project

• Initialize npm

npm init -y

• Install typescript as a dev dependency.

npm i -D typescript

• Create a typescript config file

npx tsc --init

the D flag installs it as a dev dependency

• Install express (dependency) and it's types (dev dependency)

npm i express
npm i -D @types/express

• Create a src folder and create a new file 'index.ts' and copy the following code.

import express from "express";

const app = express();

app.get("/", (req, res) => {
    res.send("Hello World");
});

app.listen(5000, () => {
    console.log("server started");
});

• Open tsconfig.json and find "outDir", uncomment it, and update its value to dist

"outDir": "./dist"

• Install nodemon (dev dependency)

npm i -D nodemon

• Install ts-node (dev dependency)

npm i -D ts-node

• Open package.json update main to be

"main": "dist/index.js"

and add the following under scripts

"start": "nodemon src/index.ts"

• Install eslint (dev dependency)

npm i -D eslint

• Create a eslint config file

npx eslint --init

Choose all the config from the prompt

• Add lint to script in package.json

"lint": "eslint . --ext .ts"