Function push_once 

pub fn push_once(
    git: &PushGit,
    branch_ref: &str,
    landed_oid: &str,
    err: &mut dyn Write,
) -> Result<AutoPushResult, SingleFlightError>

What: Push a landed commit’s branch once, with no coordination with other processes. Why: The service’s push consumer is the only pusher of the repositories it serves and coalesces pending pushes of one branch into this single call, so it needs no lock.

In TS you’d write (pseudocode):

const result = await pushOnce({ gitPath, cwd }, landedOid);