vue-cli: [cypress] test:e2e doesn't run in headless mode if project uses cli-plugin-typescript

Version

3.1.1

Reproduction link

https://github.com/cexbrayat/vue-cypress-e2e-issue

Node and OS info

Node 8.11, npm 6.4, macOS 10.14

Steps to reproduce

npx @vue/cli@3.1.1 create vue-cypress-e2e-issue --inlinePreset '{"useConfigFiles": true,"plugins": {"@vue/cli-plugin-typescript": {"classComponent": true,"tsLint": true,"lintOn": ["save"]},"@vue/cli-plugin-unit-jest": {},"@vue/cli-plugin-e2e-cypress": {}}}'

# or git clone https://github.com/cexbrayat/vue-cypress-e2e-issue

cd vue-cypress-e2e-issue
npm run test:e2e -- --headless

What is expected?

When running npm run test:e2e -- --headless, the test should complete.

What is actually happening?

The task hangs and never runs the test nor fails or completes.

It logs:

vue-cypress-e2e-issue git:master ❯ npm run test:e2e -- --headless

> vue-cypress-e2e-issue@0.1.0 test:e2e /Users/ced-pro/Code/test/vue/vue-cypress-e2e-issue
> vue-cli-service test:e2e "--headless"

 INFO  Starting e2e tests...
 INFO  Starting development server...
Starting type checking and linting service...
Using 1 worker with 2048MB memory limit


 DONE  Compiled successfully in 2012ms                                                                                            11:45:27 AM

Type checking and linting in progress...

  App running at:
  - Local:   http://localhost:8080/
  - Network: http://192.168.150.187:8080/

  App is served in production mode.
  Note this is for preview or E2E testing only.

No type errors found
No lint errors found
Version: typescript 3.1.6, tslint 5.11.0
Time: 2246ms

====================================================================================================

  (Run Starting)

  ┌────────────────────────────────────────────────────────────────────────────────────────────────┐
  │ Cypress:    3.1.1                                                                              │
  │ Browser:    Electron 59 (headless)                                                             │
  │ Specs:      1 found (test.js)                                                                  │
  └────────────────────────────────────────────────────────────────────────────────────────────────┘


────────────────────────────────────────────────────────────────────────────────────────────────────

  Running: test.js...                                                                      (1 of 1)
Starting type checking and linting service...
Using 1 worker with 2048MB memory limit


 DONE  Compiled successfully in 2994ms

And hangs there indefinitely.

Note that it works well if not in headless mode.

---

The project uses cli-plugin-typescript. The e2e tests run fine if not in headless mode.

If TypeScript is not used, the e2e tests are fine in headless mode or not.

Workaround

Commenting:

module.exports = (on, config) => {
  on('file:preprocessor', webpack({
    // webpackOptions: require('@vue/cli-service/webpack.config'),
    watchOptions: {}
  }))

in tests/e2e/plugins/index.js fixes the issue. The task then run fine in headless mode as well.

Might be related to https://github.com/vuejs/vue-cli/issues/2783 but in this case I never have a complete run not even the first one.