SPFx: which QueryTemplate can I use in pnp.sp.search?

Question

I wonder which QueryTemplate available to use with pnp.sp.search?

For right now I find only one property :"(IsDocument:True)"

 pnp.sp.search({
                Querytext: query,
                RowLimit: 20,
                StartRow: 0,
                SelectProperties: ["Title", "Author", "Path", "FileType", "RefinersTextListOWSTEXT"],
                QueryTemplate: "(IsDocument: True)"
            })

Answer 1

QueryTemplate is a string that contains the text that replaces the query text, as part of a query transform.

Source: QueryTemplate

It allows other properties as well like:

{
  '__metadata': {
      'type': 'Microsoft.Office.Server.Search.REST.SearchRequest'
   },
  'Querytext': 'sharepoint',
  'QueryTemplate': '{searchterms} Author:johndoe'
}

You can also use query variable like {User.Name}, {Site.URL}, etc. Check list of query variables at:

1. Understanding query transforms
2. Query variables in SharePoint

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Update from comments:

You can find list of all standard properties at: Overview of crawled and managed properties in SharePoint Server - few properties might not be available in SharePoint online