Templates are hygienic by default, so `props` is unknown to `children`, see
<https://nim-lang.org/docs/manual.html#templates-identifier-construction>
I changed a few things to make your example compile without importing
`htmlElements`, most importantly note the `props {.inject.}`:
template html*(name: untyped, children: untyped) =
proc `name`*(): string =
result = "<html>" & `children` & "</html>"
template h1*(children: untyped): string =
"<h1>" & `children` & "</h1>"
template component*[T](name: untyped, children: untyped) =
template `name`*(props {.inject.}: T): string =
`children`
type MyProp = object
text: string
component[MyProp](MyComponent):
h1:
props.text
html app:
MyComponent(MyProp(text: "HELLO WORLD"))
echo app()
# <html><h1>HELLO WORLD</h1></html>
Run
