src/node/wrapper.ts/ParentProcess/spawn
class ParentProcess:  private spawn(): cp.ChildProcess {
    return cp.fork(path.join(__dirname, "entry"), {
      env: {
        ...process.env,
        CODE_SERVER_PARENT_PID: process.pid.toString(),
        NODE_EXEC_PATH: process.execPath,
      },
      stdio: ["pipe", "pipe", "pipe", "ipc"],
    })
  }