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To focus on a specific ESLint error message in the scripts of your package.json, you can use the --rule flag followed by the name of the rule you want to focus on. For example, if you want to focus on the "no-console" rule, you can add the following script to your package.json:

"lint": "eslint --rule 'no-console: error' ."

This will run ESLint on all files in the current directory and its subdirectories, and only report errors related to the "no-console" rule. You can replace "error" with "warn" if you want to only report warnings for that rule.