Dialog Box for Custom Developed Visual?

I want a custom dialog box to display when a user clicks on an element within a visual.

I found the following page:

https://docs.microsoft.com/en-us/power-bi/developer/visuals/create-display-dialog-box#create-the-dialog-box-implementation-file 

The page describes how to build a date picker dialog.  In the new class, there are two import statements that I get an error on:

The first error I encountered was that powerbi was not defined, but I fixed that by including the "import powerbi from "powerbi-visuals-api" before the lines above.

It looks like DialogConstructor Options is not a named member, nor is DialogAction.

Have there been changes that stopped this from working?  Has it been moved somewhere else?

Thanks,

William