bug(virtual-scroll): Type inference broken when using *ngFor nested inside *cdkVirtualFor with keyvalue pipe

[benelliott]

Is this a regression?

• Yes, this behavior used to work in the previous version

The previous version in which this bug was not present was

No response

Description

Note: StackBlitz template is outdated, points to v15.x, but this is present in 16.0.4 also.

If you iterate over a key-value collection using *ngFor inside a *cdkVirtualFor, you encounter a compile error.

This error does not occur if you use *ngFor nested inside *ngFor.

Reproduction

StackBlitz link: https://stackblitz.com/edit/components-issue-kfvxis?file=src%2Fapp%2Fexample-component.html
Steps to reproduce:

1. Open demo
2. Observe no compile error under *ngFor
3. Uncomment *cdkVirtualFor example
4. Observe compile error

Expected Behavior

CdkVirtualFor should be a drop-in replacement for NgFor.

Actual Behavior

Object is of type 'unknown'. error.

Environment

• Angular: 16.0.5
• CDK/Material: 16.0.4
• Browser(s): All
• Operating System (e.g. Windows, macOS, Ubuntu): All

[crisbeto]

I suspect this is the same root cause as #26609 where we don't have proper typings for the virtual for context yet.

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