pub fn all_entries(
  handle: Handle(D),
) -> promise.Promise(
  Result(
    #(array.Array(Handle(D)), array.Array(Handle(F))),
    String,
  ),
)

pub fn close(
  file_handle: WritableFileStream,
) -> promise.Promise(Result(Nil, String))

pub fn create_writable(
  file_handle: Handle(F),
) -> promise.Promise(Result(WritableFileStream, String))

pub fn get_directory_handle(
  handle: Handle(D),
  name: String,
  create: Bool,
) -> promise.Promise(Result(Handle(D), String))

pub fn get_file(
  file_handle: Handle(F),
) -> promise.Promise(Result(jsfile.File, String))

pub fn get_file_handle(
  handle: Handle(D),
  name: String,
  create: Bool,
) -> promise.Promise(Result(Handle(F), String))

pub fn name(handle: Handle(a)) -> String

pub fn remove_entry(
  handle: Handle(D),
  name: String,
  create: Bool,
) -> promise.Promise(Result(Nil, String))

pub fn show_directory_picker() -> promise.Promise(
  Result(Handle(D), String),
)

pub fn show_open_file_picker() -> promise.Promise(
  Result(array.Array(Handle(F)), String),
)

pub fn show_save_file_picker() -> promise.Promise(
  Result(Handle(F), String),
)

pub fn write(
  file_handle: WritableFileStream,
  content: BitArray,
) -> promise.Promise(Result(Nil, String))