spike: cjs to esm strategy

[AtofStryker]

• Closes

Additional details

Steps to test

How has the user experience changed?

PR Tasks

• Have tests been added/updated?
• Has a PR for user-facing changes been opened in cypress-documentation?
• Have API changes been updated in the type definitions?

[cypress]

cypress    Run #63924

Run Properties:   Failed #63924  •  cb1b55640d: test

Project	cypress
Branch Review	spike/esm_goalposting_with_cursor
Run status	Failed #63924
Run duration	19m 11s
Commit	cb1b55640d: test
Committer	Bill Glesias
View all properties for this run ↗︎

---

Test results
Failures	2
Flaky	10
Pending	1105
Skipped	0
Passing	26511
View all changes introduced in this branch ↗︎

UI Coverage  45.01%
Untested elements	188
Tested elements	158

Accessibility  97.82%
Failed rules	4 critical   8 serious   2 moderate   2 minor
Failed elements	109

---

Tests for review

  cypress/e2e/error-handling.cy.ts • 2 failed tests • launchpad-e2e

View Output

Test		Artifacts
Error handling > using bundler: "vite" with missing config > displays informative error about what went wrong and where we looked		Test Replay Screenshots
... > handles missing webpack.config		Test Replay Screenshots

  issues/28527.cy.ts • 1 flaky test • 5x-driver-electron

View Output

Test		Artifacts
issue 28527 > fails and then retries and verifies about:blank is not displayed		Test Replay Screenshots

  e2e/origin/cookie_behavior.cy.ts • 1 flaky test • 5x-driver-chrome:beta

View Output

Test		Artifacts
... > misc > domains > attaches subdomain and TLD cookies when making subdomain requests		Test Replay

  issues/28527.cy.ts • 1 flaky test • 5x-driver-chrome:beta

View Output

Test		Artifacts
issue 28527 > fails and then retries and verifies about:blank is not displayed		Test Replay Screenshots

  commands/waiting.cy.js • 1 flaky test • 5x-driver-chrome

View Output

Test		Artifacts
... > errors > throws when route is never resolved		Test Replay

  e2e/origin/config_env.cy.ts • 1 flaky test • 5x-driver-chrome

View Output

Test		Artifacts
cy.origin- Cypress.config() > serializable > overwrites different values in secondary if one exists in the primary		Test Replay

The first 5 flaky specs are shown, see all 10 specs in Cypress Cloud.

[cursor]

Bug: TypeScript File Extension Causes Test Failures

The run_child_fixture.ts file incorrectly uses require.resolve() with a hardcoded .ts extension for require_async_child.ts. require.resolve() expects compiled .js files, not TypeScript source files, which will cause runtime failures. This also creates an inconsistency with ProjectConfigIpc.ts, which uses environment-based conditional logic to resolve .js in production and .ts in development, potentially causing the test to fail in production environments or when CYPRESS_INTERNAL_ENV is 'production'.

packages/server/test/unit/plugins/child/run_child_fixture.ts#L4-L5

cypress/packages/server/test/unit/plugins/child/run_child_fixture.ts

Lines 4 to 5 in cb1b556

	const REQUIRE_ASYNC_CHILD_PATH = require.resolve('@packages/server/lib/plugins/child/require_async_child.ts')

Fix in Cursor • Fix in Web

---

Was this report helpful? Give feedback by reacting with 👍 or 👎