Webpack keeps on creating dist folder?

I'm working on server side coding using Node.js. I've noticed Webpack (I think) is randomly creating dist folder with .dev.js files. I'm not running build, I'm starting server with nodemon npm run start.

Image of what I'm talking about

package.json

{
  "name": "card-match-game-server",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "nodemon index.js"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "nodemon": "^2.0.6"
  },
  "dependencies": {
    "bcryptjs": "^2.4.3",
    "body-parser": "^1.19.0",
    "cors": "^2.8.5",
    "express": "^4.17.1",
    "jsonwebtoken": "^8.5.1",
    "lodash.shuffle": "^4.2.0",
    "mongoose": "^5.11.6",
    "socket.io": "^3.0.4"
  }
}

Can someone clarify why those dist folders are auto generated and the purpose of it? Thanks.