bug (docs): Bad recommendation to export standalone component groups as readonly array

[hakimio]

Describe the problem that you experienced

"Standalone components for library authors" section of the docs recommends exporting standalone component groups as readonly array, but readonly arrays can not be used in NgModule imports and language service does not recognize readonly arrays when they are imported in standalone component imports.
Related issue #48089 which hasn't been resolved for a year now.

Enter the URL of the topic with the problem

https://angular.io/guide/standalone-components#standalone-components-for-library-authors

Describe what you were looking for in the documentation

Good recommendation how to handle standalone component groups in a library.

Describe the actions that led you to experience the problem

Tried to use readonly array of standalone components in NgModule and standalone component imports. When used in NgModule imports it leads to compilation error and when used in standalone component imports it leads to language service errors.

Describe what you want to experience that would fix the problem

Do not recommend to export standalone component groups as readonly array. Non-readonly array works but readonly one does not.

Add a screenshot if that helps illustrate the problem

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If this problem caused an exception or error, please paste it here

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If the problem is browser-specific, please specify the device, OS, browser, and version

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Provide any additional information here in as much as detail as you can

There was a PR #48106 opened to support readonly array imports in NgModule a year ago but it was never merged.
@pkozlowski-opensource

[JoostK]

I don't think we should be changing the doc; this should work and #48106 deserves some love to fix the problem. Closing for #48089.

[hakimio]

But it does NOT work now and it doesn't seem that the PR will be merged any time soon.

[pkozlowski-opensource]

and it doesn't seem that the PR will be merged any time soon.

We should merge this PR, will try to pick it up in the coming days.

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