bun.sh/test/js/bun/spawn/spawn_waiter_thread-fixture.js

const { spawn } = require("child_process");

if (!process.env.WITHOUT_WAITER_THREAD) {
  if (!process.env.BUN_GARBAGE_COLLECTOR_LEVEL || !process.env.BUN_FEATURE_FLAG_FORCE_WAITER_THREAD) {
    throw new Error("This test must be run with BUN_GARBAGE_COLLECTOR_LEVEL and BUN_FEATURE_FLAG_FORCE_WAITER_THREAD");
  }
}

spawn(process.argv0, ["-e", "Bun.sleepSync(999999999)"]);