Cypress 15: Breaking changes

[jennifer-shehane]

What would you like?

This is just an issue to track potentially breaking changes for Cypress 15 - decisions are not final at this point.

• Firefox:
  • CDP code removal for Firefox (BiDi now mainstream with feat: implement webdriver BiDi for Firefox versions 135 and greater #30870 ) BREAKING CHANGE: Remove support for CDP within Firefox #31189
  • Cut over methods in @packages/extension that are firefox specific to use BiDi misc: Replace @packages/extension methods that are now implemented by WebDriver BiDi when BiDi is enabled #30221. Assess progress on milestone
• Replace ts-node with tsx for user configuration parsing and cypress runtime
  • Spike into removing ts-node [Spike] Investigate migrating off of ts-node #30426
  • Update @packages/data-context to use Stage 3 decorators chore: update decorators in @packages/data-context to use Stage 3 decorators #31184
  • Replace ts-node with tsx for user configuration parsing and cypress runtime feat: replace ts-node with tsx for user configuration parsing and cypress runtime #31185
  • Allow for WBIP to take all of the users resolved config ts-loader in @cypress/webpack-batteries-included-preprocessor should respect all user compiler options #31282
  • Update mocha / unit tests to register ts-node directly and remove @packages/ts chore: replace references to @packages/ts inside mocha register functions to us ts-node/register #31186
  • Remove TypeScript 4 support BREAKING CHANGE: Remove support for TypeScript 4 #31187
• With removal of injectDocumentDomain, we should change the default domain behavior of the Cypress cookie APIs to include subdomain (which is the standard implementation) Cypress 15: remove deprecated injectDocumentDomain configuration option #30816
• Feat: certain Cypress commands should not be bound to window in order to avoid cross origin issues Feat: certain Cypress commands should not be bound to window in order to avoid cross origin issues #31196
• Node.js 18 + 23 support removal Node.js 18 + 23 support removal #31302
• Electron 35 upgrade (Node.js 22 upgrade) (what are the glibc implications?) Electron Update (35) #31257
• Webpack 4 removal possibly
• Remove migrations scripts for v9 -> v10 upgrades, etc
• Remove deprecated cy.stub signature
• Remove fallback polyfills in webpack-batteries-included-preprocessor Remove fallback polyfills in webpack-batteries-included-preprocessor #31039
• Fix any remaining Cy 14 issues before 15: https://github.com/cypress-io/cypress/issues?q=is%3Aissue%20state%3Aopen%20label%3A%22v14.0.0%20%F0%9F%90%9B%22

Component testing

• Remove support for Angular 17 (EOL security support 15 May 2025) Remove Angular 17 support #31303
• Add support for Angular 20 (Estimated week of 19 May 2025) Angular 20 support #31304

[MikeMcC399]

• Electron 34 upgrade (Node.js 22 upgrade) (what are the glibc implications?)

https://github.com/nodejs/node/blob/v22.12.0/BUILDING.md

I don't see any change for glibc.

[MikeMcC399]

Node.js 18 + 23 support removal

Node.js EOLs are:

Node.js	EOL
18.x	2025-04-30
23.x	2025-06-01

Currently

cypress/cli/package.json

Lines 122 to 124 in 6bd522b

	"engines": {
	"node": "^18.0.0 || ^20.0.0 || >=22.0.0"
	},

Should probably migrate to

"node": "^20.0.0 || ^22.0.0 || >=24.0.0"

with deprecation of Node.js 18 prior to Cypress 15