Cannot find module 'typescript'

When running Cypress v3.1.4 “on its own”, things work fine, but if I add in @percy/cypress 0.2.3, things suddenly go wrong:

C:\Users\Pomax\Documents\Git\collaborations\mozilla\foundation.mozilla.org>npm run percy

> network@1.0.0 percy C:\Users\Pomax\Documents\Git\collaborations\mozilla\foundation.mozilla.org
> percy exec -- npm run cypress

module.js:549
    throw err;
    ^

Error: Cannot find module 'typescript'
    at Function.Module._resolveFilename (module.js:547:15)
    at Function.Module._load (module.js:474:25)
    at Module.require (module.js:596:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (J:\Junctions\Users\Mike\Documents\Git\collaborations\mozilla\foundation.mozilla.org\node_modules\@oclif\config\lib\ts-node.js:5:22)
    at Module._compile (module.js:652:30)
    at Object.Module._extensions..js (module.js:663:10)
    at Module.load (module.js:565:32)
    at tryModuleLoad (module.js:505:12)
    at Function.Module._load (module.js:497:3)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! network@1.0.0 percy: `percy exec -- npm run cypress`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the network@1.0.0 percy script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

This worked fine before (where “before” was actually just a few hours ago), but I’m also seeing this go wrong on Travis CI now:

(We had to add a separate npm i typescript to our Travis setup, outside of the package.json, to get things to work)

Any idea why all of a sudden typescript is causing failures?

Cypress run without percy:

C:\Users\Pomax\Documents\Git\collaborations\mozilla\foundation.mozilla.org>npm run cypress

> network@1.0.0 cypress C:\Users\Pomax\Documents\Git\collaborations\mozilla\foundation.mozilla.org
> run-p --race server cypress:test


> network@1.0.0 server C:\Users\Pomax\Documents\Git\collaborations\mozilla\foundation.mozilla.org
> pipenv run python network-api/manage.py runserver


> network@1.0.0 cypress:test C:\Users\Pomax\Documents\Git\collaborations\mozilla\foundation.mozilla.org
> wait-on tcp:8000 && cypress run

Loading .env environment variables…
Performing system checks...

System check identified no issues (0 silenced).
January 30, 2019 - 14:24:31
Django version 1.11.18, using settings 'networkapi.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CTRL-BREAK.


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

  (Run Starting)

  ┌────────────────────────────────────────────────────────────────────────────────────────────────┐
  │ Cypress:    3.1.4                                                                              │
  │ Browser:    Electron 59 (headless)                                                             │
  │ Specs:      2 found (multi-page.js, single-page.js)                                            │
  └────────────────────────────────────────────────────────────────────────────────────────────────┘


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

  Running: multi-page.js...                                                                (1 of 2)


  multipage visual regression tests
2019-01-30 14:24:52,749 [INFO] "GET /en/campaigns/multi-page/ HTTP/1.1" 200 13332
[...snip...]
2019-01-30 14:24:53,313 [INFO] "GET /environment.json HTTP/1.1" 200 235
    √ Loads the multipage campaign correctly (13362ms)


  1 passing (13s)


  (Results)

  ┌─────────────────────────────┐
  │ Tests:        1             │
  │ Passing:      1             │
  │ Failing:      0             │
  │ Pending:      0             │
  │ Skipped:      0             │
  │ Screenshots:  0             │
  │ Video:        false         │
  │ Duration:     13 seconds    │
  │ Spec Ran:     multi-page.js │
  └─────────────────────────────┘


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

  Running: single-page.js...                                                               (2 of 2)


  Integration test with visual testing
2019-01-30 14:25:07,509 [INFO] "GET / HTTP/1.1" 302 0
[...snip...]
2019-01-30 14:25:08,001 [INFO] "GET /_images/buyers-guide/earth.jpg HTTP/1.1" 200 195144
    √ Loads the homepage (12986ms)


  1 passing (13s)


  (Results)

  ┌──────────────────────────────┐
  │ Tests:        1              │
  │ Passing:      1              │
  │ Failing:      0              │
  │ Pending:      0              │
  │ Skipped:      0              │
  │ Screenshots:  0              │
  │ Video:        false          │
  │ Duration:     13 seconds     │
  │ Spec Ran:     single-page.js │
  └──────────────────────────────┘


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

  (Run Finished)


      Spec                                                Tests  Passing  Failing  Pending  Skipped
  ┌────────────────────────────────────────────────────────────────────────────────────────────────┐
  │ √ multi-page.js                             00:13        1        1        -        -        - │
  ├────────────────────────────────────────────────────────────────────────────────────────────────┤
  │ √ single-page.js                            00:13        1        1        -        -        - │
  └────────────────────────────────────────────────────────────────────────────────────────────────┘
    All specs passed!                           00:26        2        2        -        -        -

[Robdel12]

Woop! Happy to hear that. If it does happen again I’d love to hear about it.

[Pomax]

I’ve not seen it happen recently, no. Closing until (if) it happens again