bug(datepicker): "matStartDate" and "matEndDate" input directive "dateInput" and "dateChange" outputs are not recognized by Angular language service

[hakimio]

Reproduction

Steps to reproduce:

1. If you try to use dateInput or dateChange outputs with matStartDate or matEndDate directives in IDE which uses Angular language service for Angular template validation, you'll see that those outputs are marked as invalid:

Expected Behavior

IDE should not complain about dateInput and dateChange outputs since they are valid.

Actual Behavior

IDE displays error indicating that those outputs are invalid even they are valid.

Additional information

This does not happen with matDatepicker directive. When used with matDatepicker, those outputs are recognized by the Angular language service.

Environment

• Angular: 10
• CDK/Material: 10.2.6

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