fix: don't show EPIPE error

cli/CHANGELOG.md

@@ -7,6 +7,7 @@ _Released 11/18/2025 (PENDING)_
 
 - Fixed an issue where [`cy.wrap()`](https://docs.cypress.io/api/commands/wrap) would cause infinite recursion and freeze the Cypress App when called with objects containing circular references. Fixes [#24715](https://github.com/cypress-io/cypress/issues/24715). Addressed in [#32917](https://github.com/cypress-io/cypress/pull/32917).
 - Fixed an issue where top changes on test retries could cause attempt numbers to show up more than one time in the reporter and cause attempts to be lost in Test Replay. Addressed in [#32888](https://github.com/cypress-io/cypress/pull/32888).
+- 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).
 
 **Misc:**
 

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')
+    })
+  })
+})