unused-package

unused-package is a dependency analysing tool which lets you know which packages are not being used or if package is devDependency but installed as normal dependency

Installation

Using npm

npm install unused-package --save-dev

Using yarn

yarn add --dev unused-package 

Usage

create a file named unused.js in root directory with below code

const check = require("unused-package");

check({ entries: ['entry path to your code'] }).then((res) => {
  console.log(res) // list of packages returned by library
});

Example:
//for react projects
check({ entries: ['src'] }).then((res) => {
  console.log(res)
});

//for next.js projects
check({ entries: ['pages','src','components','next.config.js'] }).then((res) => {
  console.log(res)
});

Note:

• if your code has mutiple entry paths, you can pass all entry points as array form to entries parameter
• library returns the list of packages in array format. listed packages maybe not being used in code, or if devDependency is installed as normal dependency.

Include unused.js file in your build script to check for extra packages before every build step in package.json

Example:
//for react projects
"scripts":{
   "build": " node unused.js && react-scripts build",
}
//for next.js projects
"scripts":{
   "build": " node unused.js && next build",
}

OR

create a seperate script to run unused.js file

"scripts":{
  "detect:unused:packages": " node unused.js"
}

Note: Currently package is still in initial phase and if library returns and false positives please feel free to open an issue