IE11: Cannot redefine non-configurable property 'find'

[sven5]

With the current release 3.0.8 for .NET Core 3.1 I'm getting this error in IE11.

SCRIPT5078: Cannot redefine non-configurable property "find"
es.symbol.js (266,1)

Could help here?

Thanks

[Daddoon]

Do you have a reproductive scenario for this error ?
I never encountered it in my tests.

This is maybe a bug in an older version of core-js bundled in this project, or a messy implementation of a third party polyfill.
Some hints here: zloirock/core-js#790

It would be interesting that i have a reproductive scenario, as i would also test on the last Blazor server versions in .NET 5.0.

I would then ship an update to for both .NET 3.x and .NET 5.0 if i find the issue.

[sven5]

Hi @Daddoon

Thanks for your fast reply. I'm just investigating this issue and it seems that quill js is causing trouble here.

<script type="text/javascript" src="~/lib/quill/dist/quill.js"></script>

I registered quill before your polyfill lib and that seems to be wrong. When placing the quill reference after polyfill then it works.

[Daddoon]

I think that quill.js may have it's own find polyfill internally, that is applied if the required find signature is not found.

Seems that there is some interactions between the two libs, i think one or the other (quill.js or the core-js part) does not react as expected while finding an existing signature.

What's happening here i think is that by placing your file after the blazor.polyfill lib make your quill.js lib not trying to implement the find signature, as it has been found previously.

Nothing blocking, i can close this i suppose !