How to import `show headings`

Questions
1

I try to understand how to import show heading. I copied an example (working) and cut it in a main and an imported file and it stoped working.

The file dragon.typ to import:

#show heading: set align(center)
#show heading: set text(font: "DejaVu Sans Mono" )
#show heading: it => block[
  \~
  #emph(it.body)
  #counter(heading).display(it.numbering)
  \~
]

and the main:

#import "dragon.typ" : *

#set heading(numbering: "(I)")


= Dragon
With a base health of 15, the dragon is the most
powerful creature.

= Manticore
While less powerful than the dragon, the manticore
gets extra style points.

The show heading - which I understand is executed on import - is not showing effect. The titles are left aligned, not centered, not italics etc. What is my misunderstanding?

2

This is similar to How can I create a set of shared `set` and `show` rules which can be imported into a theme? - #3 by ParaN3xus and can be sorted out by wrapping your code into a function that will be used as a template for your document.

Also see Making a Template – Typst Documentation as it describes the process step by step.

#let my-template(body) = {

  show heading: set align(center)
  show heading: set text(font: "DejaVu Sans Mono" )
  show heading: it => block[
    \~
    #emph(it.body)
    #counter(heading).display(it.numbering)
    \~
  ]
  body
}

Then

#import "dragon.typ" : *
#show: my-template

#set heading(numbering: "(I)")


= Dragon
With a base health of 15, the dragon is the most
powerful creature.

= Manticore
While less powerful than the dragon, the manticore
gets extra style points.
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