fix: don't show EPIPE error

[alexsch01]

• Closes Error: write EPIPE after CTRL+C in terminal #30659

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?

---

Note

Ignore EPIPE from the config child process (prevents terminal error after CTRL+C) and add the corresponding bugfix to the changelog.

• Core/IPC:
  • In packages/data-context/src/data/ProjectConfigIpc.ts, handleChildProcessError() now early-returns on err.code === 'EPIPE' after cleanup to suppress noisy errors post-CTRL+C.
• Changelog:
  • Add bugfix entry in cli/CHANGELOG.md for avoiding EPIPE error after CTRL+C.

^{Written by Cursor Bugbot for commit e0b4158. This will update automatically on new commits. Configure here.}

[cypress-app-bot]

• Create a Draft Pull Request if your PR is not ready for review. Mark the PR as Ready for Review when you're ready for a Cypress team member to review the PR.

[jennifer-shehane]

@alexsch01 Any thoughts on how to test this?

[alexsch01]

@jennifer-shehane for manually testing this.....

cypress/packages/data-context/src/data/ProjectConfigIpc.ts

Line 109 in e0b4158

send (event: string, ...args: any[]) {

   send (event: string, ...args: any[]) {
+    if (event === "preprocessor:close") {
+      Atomics.wait(new Int32Array(new SharedArrayBuffer(4)), 0, 0, 4000)
+    }

• above adds an synchronous wait of 4000 ms

---

with a spec file such as

it("", () => {
cy.wrap(0).should("eq", 0)
})

run yarn cypress:run --project PROJECT_DIR --no-exit

• let cypress spec go all the way to the end
• then CTRL-C with and without this PR