maxListeners warning when running multiple processes in parallel

[ehmicky]

When running more than 10 execa() calls in parallel, a maxListeners warning is printed.

For this bug to happen, the option must be an array, and one of the value must be 'inherit' (or the equivalent 0, 1, 2, process.stdin, process.stdout or process.stderr). That's because each process pipes from/to the same global object, which creates more than 10 event listeners on that event emitter.

await Promise.all(Array.from({length: 11}, () => execa('...', {
  stdin: ['pipe', 'inherit'], 
  stdout: ['pipe', 'inherit'], 
  stderr: ['pipe', 'inherit'],
}));