fix: don't show EPIPE error (#32873)

* fix: don't show EPIPE error

* Update CHANGELOG.md

* add debug statements

* Create ProjectConfigIpc-real-child-process.spec.ts

* Update CHANGELOG.md

* Linux lint

* Linux lint

* Update ProjectConfigIpc-real-child-process.spec.ts

* Update ProjectConfigIpc.ts

* Update ProjectConfigIpc.ts

* avoid flake

---------

Co-authored-by: Bill Glesias <[email protected]>

Author: alexsch01

cli/CHANGELOG.md

@@ -7,6 +7,10 @@ _Released 12/16/2025 (PENDING)_
 
 - `Angular` version 21 is now supported within component testing. Addressed in [#33004](https://github.com/cypress-io/cypress/pull/33004).
 
+**Bugfixes:**
+
+- Fixed an issue where a EPIPE error shows up after CTRL+C is done in terminal. Fixes [#30659](https://github.com/cypress-io/cypress/issues/30659). Addressed in [#32873](https://github.com/cypress-io/cypress/pull/32873).
+
 ## 15.7.1
 
 _Released 12/2/2025_

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

@@ -157,7 +157,16 @@ export class ProjectConfigIpc extends EventEmitter {
 
       let resolved = false
 
-      this._childProcess.on('error', (err) => {
+      this._childProcess.on('error', (err: NodeJS.ErrnoException) => {
+        if (err.code === 'EPIPE') {
+          debug('EPIPE error in loadConfig() of child process %s', err)
+
+          // @ts-ignore
+          resolve()
+
+          return
+        }
+
         debug('unhandled error in child process %s', err)
         this.handleChildProcessError(err, this, resolved, reject)
         reject(err)
@@ -229,7 +238,16 @@ export class ProjectConfigIpc extends EventEmitter {
     return new Promise((resolve, reject) => {
       let resolved = false
 
-      this._childProcess.on('error', (err) => {
+      this._childProcess.on('error', (err: NodeJS.ErrnoException) => {
+        if (err.code === 'EPIPE') {
+          debug('EPIPE error in registerSetupIpcHandlers() of child process %s', err)
+
+          // @ts-ignore
+          resolve()
+
+          return
+        }
+
         this.handleChildProcessError(err, this, resolved, reject)
         reject(err)
       })

packages/data-context/test/unit/data/ProjectConfigIpc-real-child-process.spec.ts

@@ -0,0 +1,74 @@
+import { describe, expect, it, beforeEach, afterEach, jest } from '@jest/globals'
+import { scaffoldMigrationProject as scaffoldProject } from '../helper'
+import { ProjectConfigIpc } from '../../../src/data/ProjectConfigIpc'
+
+jest.mock('debug', () => {
+  globalThis.debugMessages = []
+  const originalDebugModule = jest.requireActual('debug')
+
+  const debug = (namespace) => {
+    // @ts-expect-error - mock
+    const originalDebug = originalDebugModule(namespace)
+
+    return ((message) => {
+      if (namespace === 'cypress:lifecycle:ProjectConfigIpc') {
+        globalThis.debugMessages.push(message)
+      }
+
+      originalDebug(message)
+    })
+  }
+
+  debug.formatters = {}
+
+  return debug
+})
+
+describe('ProjectConfigIpc', () => {
+  describe('real-child-process', () => {
+    let projectConfigIpc
+
+    beforeEach(async () => {
+      const projectPath = await scaffoldProject('e2e')
+
+      projectConfigIpc = new ProjectConfigIpc(
+        undefined,
+        undefined,
+        projectPath,
+        '',
+        false,
+        (error) => {},
+        () => {},
+        () => {},
+      )
+    })
+
+    afterEach(() => {
+      projectConfigIpc.cleanupIpc()
+    })
+
+    it('EPIPE error test', async () => {
+      const err: NodeJS.ErrnoException = new Error
+
+      err.code = 'EPIPE'
+
+      const OG_once = projectConfigIpc.once
+
+      projectConfigIpc.once = function (evt, listener) {
+        if (evt === 'setupTestingType:reply') {
+          return listener()
+        }
+
+        return OG_once.apply(this, [evt, listener])
+      }
+
+      await projectConfigIpc.loadConfig()
+      await projectConfigIpc.registerSetupIpcHandlers()
+
+      projectConfigIpc._childProcess.emit('error', err)
+
+      expect(globalThis.debugMessages.at(-2)).toEqual('EPIPE error in loadConfig() of child process %s')
+      expect(globalThis.debugMessages.at(-1)).toEqual('EPIPE error in registerSetupIpcHandlers() of child process %s')
+    }, 20_000)
+  })
+})