// A terminal directory subscription is scoped to a (cwd, workspaceId) pair, not
// cwd alone: under Model B two workspaces can share a cwd, and each must track
// and tear down its own live subscription without disturbing the other. An
// absent workspaceId (old clients) keys to the cwd on its own. The `::`
// separator cannot collide with a workspace id, which is always `wks_<hex>`.
export function terminalSubscriptionKey(
  cwd: string | undefined,
  workspaceId: string | undefined,
): string {
  if (cwd === undefined)
    return workspaceId === undefined ? "terminal-host" : `${workspaceId}::terminal-host`;
  return workspaceId === undefined ? cwd : `${workspaceId}::${cwd}`;
}