Cannot find module - Vue3, Vite & Vitest

[mikecbone]

Reduced Test Case

https://stackblitz.com/edit/github-c67sof?file=tests/CalendarFreeComponent.test.js&view=editor

Do you understand that if a reduced test case is not provided, we will intentionally delay triaging of your ticket?

• I understand

Which connector are you using (React/Angular/etc)?

Vue

Bug Description

When running very basic tests using vitest, if a component imports FullCalendar then the test fails with

Error: Cannot find module '.../node_modules/@fullcalendar/vue3/dist/FullCalendar' imported from '.../node_modules/@fullcalendar/vue3/dist/index.js'

Attached test case demos this if you run yarn test.

[puppe82]

Maybe it's the same issue I was having with the new FullCalendar 6.x version.

Webpack 5 expects modules to have file extensions for import statements. In order to disable the default behavior, one needs to set a rule fullySpecified: false

---

Webpack 5: Import fails to resolve with Module not found error

#7114

webpack 5.0.0-beta.30 Module not found: Error: Can't resolve '../../core-js/object/define-property'

webpack/webpack#11467

Webpack documentation

https://webpack.js.org/configuration/module/#resolvefullyspecified

[arshaw]

Queued for release. See #7114 (comment)

[arshaw]

Released in v6.0.3

Updated repro:
https://stackblitz.com/edit/github-c67sof-bd165u?file=package.json&view=editor