How to promisify Node’s child_process.exec and child_process.execFile functions with Bluebird?

by

I would recommend using standard JS promises built into the language over an additional library dependency like Bluebird.

If you’re using Node 10+, the Node.js docs recommend using util.promisify which returns a Promise<{ stdout, stderr }> object. See an example below:

const util = require('util');
const exec = util.promisify(require('child_process').exec);

async function lsExample() {
  try {
    const { stdout, stderr } = await exec('ls');
    console.log('stdout:', stdout);
    console.log('stderr:', stderr);
  } catch (e) {
    console.error(e); // should contain code (exit code) and signal (that caused the termination).
  }
}
lsExample()

Handle errors first from stderr.

More Related Contents:

  1. How do I convert an existing callback API to promises?
  2. When is .then(success, fail) considered an antipattern for promises?
  3. Is “.then(function(a){ return a; })” a no-op for promises?
  4. Correct way to write loops for promise.
  5. Asynchronous exception handling with bluebird promises
  6. Object method with ES6 / Bluebird promises
  7. Handling multiple catches in promise chain
  8. Limit concurrency of promise being run
  9. Catching Errors in JavaScript Promises with a First Level try … catch
  10. Are there still reasons to use promise libraries like Q or BlueBird now that we have ES6 promises? [closed]
  11. How do I handle errors with promises?
  12. Placement of catch BEFORE and AFTER then
  13. Wait promise inside for loop
  14. Limit concurrency of pending promises
  15. Issue in returning data retrieved from DB queries called in the loop
  16. Promise.all consumes all my RAM
  17. Is Node.js native Promise.all processing in parallel or sequentially?
  18. Node JS Promise.all and forEach
  19. Can’t throw error from within an async promise executor function
  20. How to check if an object is a Promise?
  21. Getting a UnhandledPromiseRejectionWarning when testing using mocha/chai
  22. How can i return status inside the promise?
  23. Nodejs express and promises not doing what I expect
  24. Promise.resolve vs new Promise(resolve)
  25. How do I use Bluebird with Angular?
  26. How to do promise.all for array of array of promises?
  27. Using mongoose promises with async/await
  28. Node.js: When to use Promises vs Callbacks
  29. JavaScript asynchronous programming: promises vs generators
  30. How to Promisify this function – nodejs [duplicate]

Leave a Comment