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breaking: remove support for React 16 and 17 for Cypress Component Testing. Additionally, remove the cypress/react18 testing harness and merge it upstream with cypress/react #30590

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@AtofStryker AtofStryker commented Nov 8, 2024

Additional details

Updates cypress/react to be the cypress/react18 test harness and removes support for react 16 and 17 for component testing. Since the cypress/react18 test harness is merged upstream into cypress/react, the cypress/react18 harness is no longer shipped with the binary and the cypress/react18 package will be deprecated when we release cypress 14 (a part of the release checklist)

most of the system test updates to react 18 happened in #30614 to make this PR smaller. The only changes here should be to reference the merged upstream harness, cypress/react

Steps to test

How has the user experience changed?

Test examples in the react test harness have been updated to use functional components and hooks (except 1 until react class components are completely removed)

You can also test migration via the binary 34043f9

  • what does migration look like for react 18 users?
    When users try to start their tests using the cypress/react18 test harness, the tests errors with cypress/react18 is not exported from cypress:
Screenshot 2024-11-15 at 9 45 43 AM

Updating cypress/react18 to cypress/react resolves the issue
Screenshot 2024-11-15 at 9 45 58 AM

  • what does migration look like for react 17 and under users?
    Users are initially warned on the launchpad that the version is not compatible
Screenshot 2024-11-15 at 9 55 22 AM

When starting Component testing with the new cypress/react harness, an error throughs that react-dom/client cannot be found
Screenshot 2024-11-15 at 9 55 37 AM

downloading @cypress/react@8 and changing the mount function from cypress/react to @cypress/react allows the tests to run
Screenshot 2024-11-15 at 9 56 05 AM

PR Tasks

@AtofStryker AtofStryker changed the base branch from develop to chore/update_react_18 November 8, 2024 17:45
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cypress bot commented Nov 8, 2024

cypress    Run #58448

Run Properties:  status check passed Passed #58448  •  git commit 90da84a3b5: update tests / suggestions from code review [run ci]
Project cypress
Branch Review breaking/remove_react_16_17_merge_react18_harness_upstream
Run status status check passed Passed #58448
Run duration 16m 59s
Commit git commit 90da84a3b5: update tests / suggestions from code review [run ci]
Committer AtofStryker
View all properties for this run ↗︎

Test results
Tests that failed  Failures 0
Tests that were flaky  Flaky 0
Tests that did not run due to a developer annotating a test with .skip  Pending 28
Tests that did not run due to a failure in a mocha hook  Skipped 0
Tests that passed  Passing 764
View all changes introduced in this branch ↗︎
UI Coverage  66.27%
  Untested elements 26  
  Tested elements 55  
Accessibility  96.21%
  Failed rules  0 critical   4 serious   1 moderate   0 minor
  Failed elements 199  

@AtofStryker AtofStryker force-pushed the breaking/remove_react_16_17_merge_react18_harness_upstream branch 8 times, most recently from 314c3f4 to 1f8d370 Compare November 13, 2024 15:00
Base automatically changed from chore/update_react_18 to release/14.0.0 November 14, 2024 00:45
@AtofStryker AtofStryker force-pushed the breaking/remove_react_16_17_merge_react18_harness_upstream branch from 1f8d370 to e253a15 Compare November 14, 2024 01:08
@AtofStryker AtofStryker changed the base branch from release/14.0.0 to chore/update-tests-prep-react-18-ct-update November 14, 2024 01:08
@AtofStryker AtofStryker self-assigned this Nov 14, 2024
@AtofStryker AtofStryker added npm: @cypress/react @cypress/react package issues npm: @cypress/react18 @cypress/react18 package issues Cypress 14 Issues scoped for Cypress 14 type: breaking change Requires a new major release version labels Nov 14, 2024
@AtofStryker AtofStryker force-pushed the chore/update-tests-prep-react-18-ct-update branch from 04b374f to cbdb33a Compare November 14, 2024 02:14
@AtofStryker AtofStryker force-pushed the breaking/remove_react_16_17_merge_react18_harness_upstream branch from e253a15 to b4337a2 Compare November 14, 2024 02:15
@AtofStryker AtofStryker force-pushed the breaking/remove_react_16_17_merge_react18_harness_upstream branch from b4337a2 to 9eb53bc Compare November 14, 2024 14:23
Base automatically changed from chore/update-tests-prep-react-18-ct-update to release/14.0.0 November 14, 2024 21:12
@AtofStryker AtofStryker force-pushed the breaking/remove_react_16_17_merge_react18_harness_upstream branch from 9eb53bc to 1fb7109 Compare November 14, 2024 21:16
import React from 'react'
import ReactDOM from 'react-dom'
import major from 'semver/functions/major'
import ReactDOM from 'react-dom/client'
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copied over from cypress/react18

@AtofStryker AtofStryker force-pushed the breaking/remove_react_16_17_merge_react18_harness_upstream branch 2 times, most recently from 25fde00 to 52061c7 Compare November 14, 2024 21:36
…d move cypress/react18 upstream into cypress/react [run ci]
@AtofStryker AtofStryker force-pushed the breaking/remove_react_16_17_merge_react18_harness_upstream branch from 52061c7 to 34043f9 Compare November 14, 2024 21:38
*/
export function mount (jsx: React.ReactNode, options: MountOptions = {}, rerenderKey?: string) {
if (major(React.version) === 18) {
const message = '[cypress/react]: You are using `cypress/react`, which is designed for React <= 17. Consider changing to `cypress/react18`, which is designed for React 18.'
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no longer need this as we only support 18 and up

@@ -1,98 +0,0 @@
# Enzyme examples

This folder shows several examples from [Enzyme docs](https://enzymejs.github.io/enzyme/).
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enzyme example tests are deleted since enzyme is no longer maintained

@AtofStryker AtofStryker marked this pull request as ready for review November 15, 2024 14:59
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Cypress 14 Issues scoped for Cypress 14 npm: @cypress/react @cypress/react package issues npm: @cypress/react18 @cypress/react18 package issues type: breaking change Requires a new major release version
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