{{/* Return the page's `image` frontmatter as a map, or an empty map if unset.
     Warns if `image` is set but not an object. */}}
{{ $img := .Params.image }}
{{ $result := dict }}
{{ if $img }}
  {{ if reflect.IsMap $img }}
    {{ $result = $img }}
  {{ else }}
    {{ warnf "page %q: `image` frontmatter must be an object, e.g.\n  image:\n    filename: cover.jpg\nGot: %v" .Path $img }}
  {{ end }}
{{ end }}
{{ return $result }}