spawn exec in js

spawn.js

// ========================================================
// REFERENCE
// ========================================================
async function spawnApplication({ log, ctx, is }) {
  const startPath = "./src/start.js";
  const childServer = spawn(`node`, [startPath, "8083", "ram", "write"]);
  childServer.stdout.on("data", (data) => {
    const str = data.toString().trim();
    log(ll.info, "SPAWN:", str);
  });
  childServer.stderr.on("data", (data) => {
    log(ll.alert, "SPAWN:", data.toString());
  });

  const p = new Promise((resolve, reject) => {
    childServer.on("close", (code) => {
      log(ll.info, "SPAWN", `child process close all stdio with code ${code}`);
      resolve(code);
    });

    childServer.on("exit", (code) => {
      log(ll.info, "SPAWN", `child process exited with code ${code}`);
      resolve(code);
    });
  });
  return p;
}

async function killServer(port) {
  try {
    const cmd = `lsof -i:${port} | grep LISTEN | awk '{print $2}'`;
    const { stdout } = await execP(cmd);
    const pid = stdout.trim();
    await execP(`kill -9 ${pid}`);
    log(ll.alert, "KILLED", pid);
  } catch (error) {
    log(ll.alert, "KILL", "PORT OPEN");
  }
}