Cypress v8.0.0 — Release Notes & Engineering Impact

_Released 07/19/2021_ **Summary:** We've made some updates to ensure a consistent run experience across browsers. Now all browsers run via `cypress run` run headlessly, with a device pixel ratio of 1, and a screen size of 1280x720 by default. **Breaking Changes:** **<Icon name="exclamation-triangle" color="red"></Icon> Please read our [Migration Guide](https://docs.cypress.io/guides/references/migration-guide) which explains the changes in more detail and how to change your code to migrate to Cypress 8.0.** - When running `cypress run` previous to 8.0, some browsers would launch headed while others were launched headless by default. Cypress now runs all browsers during `cypress run` as headless by default. Addresses [#16832](https://github.com/cypress-io/cypress/issues/16832). - The default screen size when running a headless browser has been reverted back to 1280x720 pixels (pre 7.0 behavior). Addresses [#16853](https://github.com/cypress-io/cypress/issues/16853). - When running the `--headless` Chrome browser via `cypress run`, the device pixel ratio will now be 1 by default, matching the behavior of all other browsers. This behavior can be overridden through the [browser launch API](https://docs.cypress.io/api/plugins/browser-launch-api#Override-the-device-pixel-ratio). Addresses [#17375](https://github.com/cypress-io/cypress/issues/17375). - Cypress now enforces version checks for browser launching and will error during `cypress run` and not allow opening the browser in `cypress open` when attempting to open unsupported browser versions. Cypress supports Chrome >= 64, Firefox >= 86, and Edge >= 79. Addressed in [#17355](https://github.com/cypress-io/cypress/pull/17355). - Arguments returned from a chained function will no longer incorrectly be of type `jQuery` and instead have an `any` type. Fixes [#16669](https://github.com/cypress-io/cypress/issues/16669). - The `Cypress.ConfigOptions`, `Cypress.ResolvedConfigOptions` and `Cypress.RuntimeConfigOption` types have been updated so that `ConfigOptions` match the JSON schema. Addressed in [#17251](https://github.com/cypress-io/cypress/pull/17251). **Features:** - You can now configure certificate authority (CA) and client certificates to use within tests on a per-URL basis via a `clientCertificates` configuration option. See [Client certificates](https://docs.cypress.io/guides/references/client-certificates) for more detail. - Setting the environment variable `ELECTRON_RUN_AS_NODE` now starts Cypress as a normal Node.js process rather than an Electron process. See [Running headless tests without Xvfb](https://docs.cypress.io/guides/continuous-integration/introduction#Running-headless-tests-without-Xvfb) for more details. Addresses [#16505](https://github.com/cypress-io/cypress/issues/16505). **Bugfixes:** - `console.log` and `console.error` called within the [plugins file](https://docs.cypress.io/guides/core-concepts/writing-and-organizing-tests.html#Plugin-files) will now be captured in the `stdout` sent to the Cypress Dashboard, making it visible in Output logs in the Dashboard. Fixes [#7434](https://github.com/cypress-io/cypress/issues/7434). - There are several fixes for [`cy.intercept()`](/api/commands/intercept) including: - The `times` option now works correctly with `req.continue`. Fixes [#16821](https://github.com/cypress-io/cypress/issues/16821). - `localhost` is now accepted as a valid `hostname` in the `RouteMatcher`. Fixes [#17015](https://github.com/cypress-io/cypress/issues/17015). - `delay` now works correctly with a `statusCode` of 204. Fixes [#15188](https://github.com/cypress-io/cypress/issues/15188). - When using the experimental [Cypress Studio](https://docs.cypress.io/guides/core-concepts/cypress-studio), there should be a reduced occurrence of "Studio failed to save commands" error messages. Fixes [#14767](https://github.com/cypress-io/cypress/issues/14767). - [`cy.invoke()`](/api/commands/invoke) now retains the proper `this` context on nested object methods. Fixes [#3871](https://github.com/cypress-io/cypress/issues/3871). - We no longer trigger unnecessary snapshot re-renders when hovering over the Command Log. Fixes [#17257](https://github.com/cypress-io/cypress/issues/17257).