Promise with shell in Node.js

promise-with-shell-in-node.js

const { exec } = require('child_process')

/**
 * Executes shell command and return as a Promise.
 * @param cmd {string}
 * @return {Promise<string>}
 */

const execShell = cmd => {
  return new Promise((resolve, reject) => {
    exec(cmd, (error, stdout, stderr) => {
      if (error) {
        console.warn(error)
      }
      resolve(stdout ? stdout : stderr)
    })
  })
}

// use
execShell('ls -al')
  .then(d => console.log(d))
  .catch(e => console.log(e))

// Credit:
// https://nodejs.org/api/child_process.html
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise
// https://medium.com/@ali.dev/how-to-use-promise-with-exec-in-node-js-a39c4d7bbf77