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ESLint report unused disables ​

A boolean flag given to the ESLint CLI to tell it to throw errors for unused // eslint-disable-line directives.

The flag is --report-unused-disable-directives:

shell
npx eslint --report-unused-disable-directives file.js

Output looks like:

/Users/me/file.js
  60:11  error  Unused eslint-disable directive (no problems were reported from 'no-unused-vars')

See Command Line Interface Reference - ESLint - Pluggable JavaScript Linter