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# Custom ESLint rules for Chromium DevTools The [`lib/` folder](./lib/) contains a set of [ESLint](https://eslint.org) rules specific to Chromium DevTools. These rules are executed as part of the ``` npm run lint ``` command and implicitly via the [Presubmit checks](../../test/README.md#Presubmit-checks). We follow the ESLint [Rule Naming Conventions](https://eslint.org/docs/latest/contribute/core-rules#rule-naming-conventions) and consistently use dashes to separate words (instead of underscores), and prefix all rules that disallow something with `no-`. ## Testing the rules When writing a custom ESLint rule, place the logic into a file `lib/foo.js` and add a corresponding test for the logic to `tests/foo.test.js`. You can use ``` npm run test -- ./scripts/eslint_rules/tests ``` to run the tests for the custom ESLint rules.