pub fn compare_date(
  a: Frontmatter,
  b: Frontmatter,
) -> order.Order

pub fn create_pipeline(
  out_dir: fs.Path,
  content_dir: fs.Path,
  static_dir: fs.Path,
) -> charge.Pipeline(
  markdown.MarkdownFile(Frontmatter),
  dict.Dict(String, List(Frontmatter)),
)

pub fn frontmatter_decoder(
  path: fs.SitePath,
) -> decode.Decoder(Frontmatter)

pub fn group_by_tag(
  frontmatters: List(Frontmatter),
) -> dict.Dict(String, List(Frontmatter))

pub fn main() -> promise.Promise(Nil)

pub fn render_page(
  file: markdown.MarkdownFile(Frontmatter),
  tags: dict.Dict(String, List(Frontmatter)),
) -> Result(element.ElementTree, a)