typescript errors when upgrading to calcite 1.4.x

GaryB

Hi, 

I just upgraded Calcite from version 1.3 to version 1.4 and now have 140 typescript errors where I previously had it down to only two that I couldn't resolve.  The following is an example of a very frequent new message.  What I am I doing wrong?

 let fromDatePicker = document.getElementById("form57-fltr-sel-fromdate-datepicker") as HTMLCalciteDatePickerElement

 and this is the error I am getting:

Conversion of type 'HTMLElement | null' to type 'HTMLCalciteDatePickerElement' may be a mistake because neither type sufficiently overlaps with the other. If this was intentional, convert the expression to 'unknown' first.  Type 'HTMLElement' is not comparable to type 'CalciteDatePicker'.

Thanks!

coryeicher

Are you using React by chance?

Basically your item could be undefined, and undefined isn't compatible with
the type `HTMLCalciteDatePickerElement`

Have a look here for a couple ways to address this:
https://stackoverflow.com/questions/63520680/argument-of-type-htmlelement-null-is-not-assignable-to-parameter-of-type-el