Declaration merging for external packages

Hi!
I'm using unoCSS with Deno Fresh and have been attempting to use the attributify preset (https://unocss.dev/presets/attributify#preact).
However for the type inference to work this preset requires to override preact's JSXInternal namespace declaration (which I think is quite a popular pattern with frontend / fullstack frameworks) and I can't quite get how to do it in Deno (and if it's even possible).

Tl;DR How can one do the following in Deno?

declare module 'preact' {
  namespace JSX {
    interface HTMLAttributes extends AttributifyAttributes {}
  }
}

declare module 'preact' {
  namespace JSX {
    interface HTMLAttributes extends AttributifyAttributes {}
  }
}

declare module 'preact' {
  namespace JSX {
    interface HTMLAttributes extends AttributifyAttributes {}
  }
}

declare module 'preact' {
  namespace JSX {
    interface HTMLAttributes extends AttributifyAttributes {}
  }
}

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Declaration merging for external packages

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