test: complete example plugins migration to v10+

[MikeMcC399]

Since the Plugins file is deprecated in Cypress 10+, this PR updates:

• examples/browser
• examples/env
• examples/firefox
• examples/quiet

to move the previously migrated Cypress v9 contents of cypress/plugins/index.js into cypress.config.js instead of requiring it. The deprecated cypress/plugins/index.js file is then deleted. This is done for each of the above examples.

This makes the file usage consistent with a native Cypress (modern) configuration instead of continuing with a hybrid Legacy configuration / modern configuration left behind by the migration wizard.

Background

Cypress Legacy configuration > Folders / Files for versions 9 and below uses a default pluginsFile of cypress/plugins/index.js.

Cypress (modern) configuration does not include a pluginsFile at all. According to the Cypress documentation setupNodeEvents the Plugins file is deprecated.

The Migrations Guide for Cypress 10.0 > Plugins File Removed explains the details for this change. The migration wizard of Cypress 10.x and 12.x however does not automatically remove the cypress/plugins/index.js. It leaves it in place and integrates it into the modern / configuration. It merely leaves a "TODO" note in cypress.config.js:

  e2e: {
    // We've imported your old cypress plugins here.
    // You may want to clean this up later by importing these.
    setupNodeEvents(on, config) {
      return require('./cypress/plugins/index.js')(on, config)
    },
  },

Local Verification

Each of the examples should run successfully locally:

browser

cd examples/browser
npm test

env

cd examples/env
export CYPRESS_environmentName='staging'
npx cypress run -s cypress/e2e/without-env.cy.js
export CYPRESS_host='http://api.dev.local'
export CYPRESS_apiPort='4222'
npx cypress run -s cypress/e2e/spec.cy.js

firefox

cd examples/firefox
npm test

quiet

cd examples/quiet
npm test

GitHub verification

All example workflows should run successfully, including:

• example-chrome.yml
• example-env.yml
• example-firefox.yml
• example-quiet.yml

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[github-actions]

🎉 This PR is included in version 5.8.1 🎉

The release is available on:

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

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