In your Haraka module:

1. Add to NPM dependencies:

npm install --save-dev @haraka/eslint-config

2. Configure eslint:

cat  <<EOLINT > .eslintrc.yaml
env:
  node: true
  es6: true
  es2022: true
extends: "@haraka"
EOLINT

3. Add to the "scripts" section of package.json:

"lint": "npx eslint@8 *.js test"
"lint:fix": "npx eslint@8 --fix *.js test"

4. Within your CI workflow:

npm run lint

To check your project against lint rules:

npm run lint

Step #4 above does this automatically when CI tests are set up.

If you agree with the lint suggestions, you can run npm run lint:fix and the changes will be made to your files automatically.

Custom rules can be added to the .eslintrc file.