next.js: v12.0.1 error: not implemented: regenerator: complex pattern in catch clause

What version of Next.js are you using?

12.0.1

What version of Node.js are you using?

14.15.0

What browser are you using?

chrome

What operating system are you using?

mac

How are you deploying your application?

NODE_OPTIONS=‘–inspect’ next dev

Describe the Bug

I got this error thread '<unnamed>' panicked at 'not implemented: regenerator: complex pattern in catch clause', /Users/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/swc_ecma_transforms_compat-0.47.1/src/es2015/regenerator/case.rs:1232:30 after upgrade from v11 to v12

Expected Behavior

it should work fine like v11 !

To Reproduce

try { // my code } catch ({ error }: any) { // handling error }

after I remove the try-catch statement everything works fine !

About this issue

Original URL
State: closed
Created 3 years ago
Reactions: 4
Comments: 16 (7 by maintainers)

Most upvoted comments

This has indeed landed in 12.0.3 👍 thanks for confirming and the reproductions provided!

timneutkens on Nov 6, 2021

Hey guys! after a little bit of research, I found that the bug is caused by object destructuring the error recieved in the catch clause of the statement.

So instead of doing this:

...
} catch ({errors}) {
    console.log(errors)
}

Just avoid destructuring:

...
} catch (error) {
    console.log(error.errors)
}

Hope this solves the problem for everyone. Cheers!

luisorbaiceta on Nov 5, 2021

Same issue here with a simple try/catch block in a component’s event handler function.

sveggiani on Oct 28, 2021