-record(builder, {
    dirs :: list(binary()),
    callback :: fun((any(), binary()) -> any()),
    initializer :: gleam@option:option(fun((gleam@erlang@process:subject(filespy:change(any()))) -> {ok,
            gleam@otp@actor:initialised(nil, filespy:change(any()), gleam@erlang@process:subject(filespy:change(any())))} |
        {error, any()})),
    before_callback :: gleam@option:option(fun((any(), binary()) -> any()))
}).