Auto-fix

WARNING: This is an experimental feature. Make sure to run in a VCS/Git repository so you can review and undo changes if necessary.

Run Knip as you normally would, and then run it again with the --fix flag to let Knip automatically apply fixes. Currently includes:

• Remove export keyword for unused exports
• Remove export keyword for unused types
• Remove unused dependencies and devDependencies from package.json
• Works across workspaces in a monorepo

knip --fix

Use --fix-type to fix only specific issue types (exports, types and/or dependencies). Example:

knip --fix-type exports,types

Example Result

The export keyword for unused exports is removed:

file.js

export default class MyClass {}
class MyClass {}

Note that also the default keyword was removed here.

Sometimes a line can be completely removed safely:

file.js

module.exports.UNUSED = 1;
module.exports['ACCESS'] = 1;

Unused dependencies are removed from package.json:

package.json

{
  "name": "my-package",
  "dependencies": {
    "rimraf": "*",
    "unused-dependency": "*"
    "rimraf": "*"
  },
  "devDependencies": {
    "unreferenced-package": "5.3.3"
  }
  "devDependencies": {}
}

Post-fix

• You may want to run tools like eslint --fix or prettier --write to fix the remaining issues.
• Verify changes in package.json and update dependencies using your package manager:

npm

npm install

pnpm

pnpm install

bun

bun install

yarn

yarn

Notes

Nothing is set in stone, but some ideas include:

• Add unlisted (dev) dependencies to package.json
• Remove unused files
• Remove unused class and enum members
• Remove empty export declarations after the fact, e.g.:

export {  }

export const { ,  } = { a, b };

export const [, ] = [c, d];