Function mergeTrees

packages/printer/src/internal/docTree.ts:442–449

(trees: ReadonlyArray<DocTree.DocTree<A>>)

}

const mergeTrees = <A>(trees: ReadonlyArray<DocTree.DocTree<A>>): DocTree.DocTree<A> => {
  if (trees.length === 0) {
    return empty
  }
  const head = trees[0]!
  const tail = trees.slice(1)
  return tail.length === 0 ? head : concat(trees)
}

const tree = <A>(
  parser: () => DocTreeParser<DocStream.DocStream<A>, DocTree.DocTree<A>>