fix: Cypress no longer fails silently in develop mode when Electron immediately exits with code 1 (#32468)

* consolidate electron files into one dir

* extract open() from electron.ts, add coverage, remove stderr filtering in dev env

* fix build after dir mod

* ...

* make behavior of paths a little more predictable, add tests

* changelog

* inf loop

* changelog

* changelog

* changelog

* decrease expected mocha result count by 1, bc electron package had empty mocha tests

* use vi.stubEnv

* missed one

* reduce exepected mocha result count

* fix tsconfig.esm.json

Author: cacieprins

.circleci/workflows.yml

@@ -1828,7 +1828,7 @@ jobs:
                   source ./scripts/ensure-node.sh
                   yarn lerna run types
             - sanitize-verify-and-store-mocha-results:
-                expectedResultCount: 19
+                expectedResultCount: 18
 
   verify-release-readiness:
     <<: *defaults

cli/CHANGELOG.md

@@ -1,4 +1,12 @@
 <!-- See the ../guides/writing-the-cypress-changelog.md for details on writing the changelog. -->
+## 15.2.1
+
+_Released 9/23/2025 (PENDING)_
+
+**Bugfixes:**
+
+- In development mode, Electron `stderr` is piped directly to Cypress' `stderr` to make it clear why Electron failed to start, if it fails to start. Fixes [#32358](https://github.com/cypress-io/cypress/issues/32358). Addressed in [32468](https://github.com/cypress-io/cypress/pull/32468).
+
 ## 15.2.0
 
 _Released 9/9/2025_

cli/tsconfig.esm.json

@@ -10,9 +10,9 @@
     "resolveJsonModule": true,
     "strict": true,
     "skipLibCheck": true,
-    "noImplicitAny": false,
+    "noImplicitAny": false
   },
   "include": [
-    "lib/**/*.mts",
+    "lib/**/*.mts"
   ]
 }

packages/electron/bin/cypress-electron

@@ -1,3 +1,3 @@
 #!/usr/bin/env node
 
-require('../dist/src/index.js').cli(process.argv.slice(2))
+require('../dist/index.js').cli(process.argv.slice(2))

packages/electron/eslint.config.ts

@@ -4,13 +4,6 @@ export default [
   ...baseConfig,
   ...cliOverrides,
   {
-    ignores: [
-      '**/dist',
-      '**/*.d.ts',
-      '**/package-lock.json',
-      '**/tsconfig.json',
-      '**/cypress/fixtures',
-    ],
   },
   {
     languageOptions: {

packages/electron/lib/electron.ts

@@ -2,7 +2,7 @@
   "name": "@packages/electron",
   "version": "0.0.0-development",
   "private": true,
-  "main": "dist/src/index.js",
+  "main": "dist/index.js",
   "scripts": {
     "build": "rimraf dist && yarn build:esm && yarn build:cjs",
     "build-binary": "node ./bin/cypress-electron --install",
@@ -12,10 +12,7 @@
     "postinstall": "echo '@packages/electron needs: yarn build'",
     "lint": "eslint",
     "start": "./bin/cypress-electron",
-    "test": "yarn test-unit",
-    "test-debug": "yarn test-unit --inspect-brk=5566",
-    "test-unit": "mocha --reporter mocha-multi-reporters --reporter-options configFile=../../mocha-reporter-config.json",
-    "test-watch": "yarn test-unit --watch"
+    "test": "yarn vitest"
   },
   "dependencies": {
     "@packages/icons": "0.0.0-development",
@@ -29,18 +26,22 @@
   "devDependencies": {
     "@electron/fuses": "1.8.0",
     "@electron/packager": "18.3.6",
+    "@vitest/coverage-v8": "^3.2.4",
+    "eslint": "^9.31.0",
     "execa": "4.1.0",
     "mocha": "3.5.3",
-    "systeminformation": "^5.27.7"
+    "systeminformation": "^5.27.7",
+    "vitest": "^3.2.4"
   },
   "files": [
     "dist",
-    "lib"
+    "bin",
+    "app"
   ],
   "bin": {
     "cypress-electron": "./bin/cypress-electron"
   },
-  "types": "dist/cjs/src/index.d.ts",
+  "types": "dist/index.d.ts",
   "lint-staged": {
     "**/*.{js,jsx,ts,tsx}": "eslint --fix"
   },