pub struct CommitInfo {
  tree : 
@mizchi/bit/object.ObjectId
ObjectId
  parents : Array[
@mizchi/bit/object.ObjectId
ObjectId]
}

pub struct ObjectStore {
  objects : Map[String, 
@mizchi/bit/object.PackObject
PackObject]
}

fn checkout_commit(store : ObjectStore, commit_id : 
@mizchi/bit/object.ObjectId
ObjectId) -> Map[String, Bytes] raise 
@mizchi/bit/object.GitError
GitError

fn checkout_commit_to_fs(store : ObjectStore, commit_id : 
@mizchi/bit/object.ObjectId
ObjectId, fs : &
@mizchi/bit/types.FileSystem
FileSystem, root : String) -> Unit raise 
@mizchi/bit/object.GitError
GitError

fn is_gitlink_mode(mode : String) -> Bool

fn is_tree_mode(mode : String) -> Bool

fn join_path(root : String, path : String) -> String

fn materialize_clone_to_fs(store : ObjectStore, commit_id : 
@mizchi/bit/object.ObjectId
ObjectId, refname : String, remote_url : String, fs : &
@mizchi/bit/types.FileSystem
FileSystem, root : String) -> Unit raise 
@mizchi/bit/object.GitError
GitError

fn parent_dir(path : String) -> String

fn parse_commit(content : Bytes) -> CommitInfo raise 
@mizchi/bit/object.GitError
GitError

fn parse_tree(content : Bytes) -> Array[
@mizchi/bit/object.TreeEntry
TreeEntry] raise 
@mizchi/bit/object.GitError
GitError

fn write_git_metadata(store : ObjectStore, commit_id : 
@mizchi/bit/object.ObjectId
ObjectId, refname : String, remote_url : String, fs : &
@mizchi/bit/types.FileSystem
FileSystem, root : String) -> Unit raise 
@mizchi/bit/object.GitError
GitError