Function run_forwarded_git 

pub fn run_forwarded_git(
    real_git: &Path,
    arguments: &[OsString],
    overlay: &[(OsString, OsString)],
    copy: Option<&CopyFacts>,
) -> ForwardedRun

What: Runs the forwarded Git command, settling the ignored-state copy around it when one applies. Why: Git’s status is the answer unless the copy failed: a copy failure after a successful Git is status 2, after a failed Git it keeps Git’s status, and a failure of the lifecycle itself is status 2, each with its message.

In TS you’d write (pseudocode):

await runGitWithWorktreeCopy({ args, gitPath, identity, command, environment });