chore(docs): update documents and example to use defineConfig()

[MikeMcC399]

• closes Document and use defineConfig() helper in examples #276

Situation

The ESLint Configuration Files documentation and the ESLint README now include the use of the helper function defineConfig() as standard configuration suggestions.

The ESLint 9.22.0 release, from Mar 7, 2025, introduced the defineConfig() and globalIgnores() helpers for configuration files. The blog article Evolving flat config with extends provides background information, including a discussion on the reintroduction of extends in configurations.

The repo eslint-plugin-cypress configurations use conventional examples without defineConfig()

Change

Migrate configurations in the following to use the defineConfig() helper function:

• README document
• eslint.config.mjs

In the test-project also migrate configurations and rename test configurations in test-project/eslint-configs to better reflect their contents.

Extending Configurations recommends to always use a files key with the extends key. Examples are written to conform to this recommendation, using cypress/**/*.js.

Verification

npm ci
npm run format:check
npm run lint

Confirm that there are no errors or format changes suggested.

cd test-project
npm install eslint ../. --no-package-lock
npx eslint -c ./eslint-configs/eslint.globals.mjs
npx eslint -c ./eslint-configs/eslint.one-rule-deprecated.mjs
npx eslint -c ./eslint-configs/eslint.one-rule.mjs
npx eslint -c ./eslint-configs/eslint.recommended.mjs
rm -rf node_modules
git restore package.json

[cypress-app-bot]

• Create a Draft Pull Request if your PR is not ready for review. Mark the PR as Ready for Review when you're ready for a Cypress team member to review the PR.

[jennifer-shehane]

🎉 This PR is included in version 5.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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