Memory leak when creating/destroying Web Components exported with @angular/elements

[aetzlecx]

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

elements

Is this a regression?

No

Description

While experimenting to get the hang behind https://github.com/angular/angular/issues/38778 I discovered that the heap memory increases over the time when web-components are created and destroyed (removed from the DOM).

Within this simple GH project it can be reproduced: https://github.com/aetzlecx/ng-elements-memory-leak

After a couple of thousand creations/destroys it can be seen that the heap increases:

Please provide a link to a minimal reproduction of the bug

https://github.com/aetzlecx/ng-elements-memory-leak

Please provide the exception or error you saw

there are no exceptions/errors, just an increasing heap

Please provide the environment you discovered this bug in

No response

Anything else?

No response

[aetzlecx]

Could it be that this issue is related to https://github.com/angular/angular/issues/41047?

[gkalpak]

Thx for reporting this, @aetzlecx :+1: Yes, #41047 could be related. Can you please check whether this also happens when using AOT and also if it happens in production mode (or only in dev mode)?

[JeanMeche]

I did some tests on the provided repo (v11, which does not include the fix for #41001 ). There is indeed a high memory usage but it's cleared by the garbage collector.

So no issue !

[aetzlecx]

I did some tests on the provided repo (v11, which does not include the fix for #41001 ). There is indeed a high memory usage but it's cleared by the garbage collector.

So no issue !

Thanks for cross checking. Can I ask how you tested this? Did you use my original code or something else?

[JeanMeche]

Yes, I did use the repo you provided !

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