Function isUnrefableTimer

packages/cli/src/commands/render.ts:1458–1467

(
  timer: ReturnType<typeof setTimeout>,
)

};

function isUnrefableTimer(
  timer: ReturnType<typeof setTimeout>,
): timer is ReturnType<typeof setTimeout> & UnrefableTimer {
  return (
    typeof timer === "object" &&
    timer !== null &&
    "unref" in timer &&
    typeof timer.unref === "function"
  );
}

function scheduleRenderProcessExit(): void {
  const timer = setTimeout(() => process.exit(0), 100);