SWC breaks full calendar

[christianjuth]

Verify canary release

• I verified that the issue exists in the latest Next.js canary release

Provide environment information

Operating System:
Platform: darwin
Arch: arm64
Version: Darwin Kernel Version 22.1.0: Sun Oct 9 20:14:30 PDT 2022; root:xnu-8792.41.9~2/RELEASE_ARM64_T8103
Binaries:
Node: 19.4.0
npm: 9.2.0
Yarn: 3.3.1
pnpm: N/A
Relevant packages:
next: 13.1.3-canary.2
eslint-config-next: 13.1.2
react: 18.2.0
react-dom: 18.2.0

Which area(s) of Next.js are affected? (leave empty if unsure)

SWC minifier (swcMinify: true)

Link to the code that reproduces this issue

https://github.com/breakthelovenewyork/next-full-calendar-test

To Reproduce

Build the repository and visit the top level index route.

Alternatively you can try this deployment I already made and look at the console.

https://full-calendar-test-christianjuth-breakthelovenewyork.vercel.app//

Describe the Bug

Next app builds and page loads initially. However, as soon as I try to interact with full calendar I get this weird null pointer error in the console. It seems – without really knowing how minifiers work – that SWC is removing an object it shouldn't be, causing the app to crash when full calendar tries to access properties on that object.

Uncaught TypeError: Cannot read properties of undefined (reading 'allDay')
    at ns (e501331d-4147ea66e121ec61.js:1:53236)
    at ru.render (e501331d-4147ea66e121ec61.js:1:89153)
    at T (407-ab674bd8c72b08ef.js:1:13663)
    at w (407-ab674bd8c72b08ef.js:1:9982)
    at T (407-ab674bd8c72b08ef.js:1:14047)
    at w (407-ab674bd8c72b08ef.js:1:9982)
    at 407-ab674bd8c72b08ef.js:1:15199
    at T (407-ab674bd8c72b08ef.js:1:15569)
    at w (407-ab674bd8c72b08ef.js:1:9982)
    at T (407-ab674bd8c72b08ef.js:1:14047)

If I set the following option it starts working.

// next.config.js
const nextConfig = {
  swcMinify: false
}

Expected Behavior

My app should word the same whether SWC is enabled or not.

Which browser are you using? (if relevant)

No response

How are you deploying your application? (if relevant)

Vercel

[mohux]

I am having the same issue and due to it, had to disabled SWC

[kdy1]

Fixed by #45776

[mohux]

I can confirm that this solved the issue for me
updating to next@canary solved the issue

@kdy1 thank you so much

[github-actions]

This closed issue has been automatically locked because it had no new activity for a month. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.