execa

Executing a shell command

This feature allows you to execute a shell command and obtain the result. The example shows how to execute the 'echo' command and print 'unicorns' to the console.

const execa = require('execa');

(async () => {
  const { stdout } = await execa('echo', ['unicorns']);
  console.log(stdout);
})();

Running a command synchronously

This feature is used to execute a command synchronously, blocking the event loop until the process has finished. The example synchronously executes the 'echo' command and logs the result.

const execa = require('execa');

const { stdout } = execa.sync('echo', ['unicorns']);
console.log(stdout);

Handling errors

This feature demonstrates error handling when a command fails to execute. The example attempts to run a non-existent command and catches the error.

const execa = require('execa');

(async () => {
  try {
    const { stdout } = await execa('wrong-command');
    console.log(stdout);
  } catch (error) {
    console.error('Error occurred:', error);
  }
})();

Streaming output

This feature allows you to stream the output of a command directly to the console or another stream. The example streams the output of the 'echo' command to the process's stdout.

const execa = require('execa');

const subprocess = execa('echo', ['unicorns']);
subprocess.stdout.pipe(process.stdout);