Make inputElement type more specific to eliminate unnecessary casting

[vursen]

Describe your motivation

The inputElement property is currently defined as HTMLElement, which is a type that represents any HTML element. However, in most of the components, this property is expected to reference an <input> or <textarea> exclusively. As a result, developers are required to cast this property to the more specific HTMLInputElement or HTMLTextAreaElement whenever they want to get access to input-specific properties like value, for example to check if the field has bad input.

Describe the solution you'd like

The inputElement property could have a more specific type based on the component:

• HTMLInputElement for components like text-field, date-picker, etc
• HTMLTextAreaElement for components like text-area
• HTMLElement (current type) for components like date-picker-light, etc

Describe alternatives you've considered

No response

Additional context

No response