VSCode Extension - Grammar Injection Into Multiple Languages

Question

I'd like my extension to apply to both HTMl and Markdown.

I understand I can use

"injectTo": [
    "text.html.derivative"
    "text.html.markdown"
],

But that doesn't work on it's own because I need to somehow have both in

"injectionSelector": "L:text.html.derivative",

How do I add Markdown to my injectionSelection in addition to HTML?

Answer 1

You can comma , separate scopes in the injectionSelector
pipe (or) | also works

"injectionSelector": "L:text.html.derivative, L:text.html.markdown"

JavaScript just so happens to convert an array into a string with the elements comma separated
so this also happens to work (not officially supported)

"injectionSelector": [
  "L:text.html.derivative",
  "L:text.html.markdown"
]