Defer blocks export default regression after upgrading to v17.2

[ArielGueta]

Which @angular/* package(s) are the source of the bug?

compiler-cli

Is this a regression?

Yes

Description

I get an error on runtime that type is undefined. It happens in a page that uses the defer block. If I revert the upgrade it works fine. I think it's related to the compiler cli package.

export function getComponentDef<T>(type: any): ComponentDef<T>|null {
  return type[NG_COMP_DEF] || null;
}

Please provide a link to a minimal reproduction of the bug

No response

Please provide the exception or error you saw

No response

Please provide the environment you discovered this bug in (run ng version)

No response

Anything else?

No response

[ArielGueta]

[ArielGueta]

When commenting the defer block code it also works fine.

[ArielGueta]

[JoostK]

Could you please share a reproduction?

[ArielGueta]

No, it's a production code. It also happens on specific page, so I don't know. I didn't changed anything except the version and it crashes. If you want to instruct me how to help to give you more information, I would love to help.

[JeanMeche]

Without a reproduction, this is hardly actionable to us. The best would be to provide a github repo with a minimal reproduction of the issue.

Also from which version did you update from ?

[ArielGueta]

From 17.1.1 to v17.2.0

[ArielGueta]

This code is generated by the compiler and I don't understand why it happens. I didn't do nothing except upgrading. Let me know what do you need from me because I can't reproduce it on simple stackblitz. I provided the debugger result and you can see that it's indeed undefined.

[ArielGueta]

I noticed to something weird. The dependenciesFn holds the array of imports:

[import("/my-comp.component-UCQE73BG.js").then((m) => m.MyComp)]

But the component is export default class MyComp {}

[ArielGueta]

That's the issue. It doesn't have m.MyComp so it returns undefined.

[JeanMeche]

If you remove the default, does it fix your issue ?

[ArielGueta]

Yes, I can confirm it's some regression when using export default.