enhancementhelp wanted
描述
When I'm working with child processes, I sometimes end up with detached processes running indefinitely after I've killed the direct child, which can lead to blocked ports and memory leaks.
I sometimes fix this by using a module like ps-tree to find out all the descendants PIDs, and then send all of them a kill command, but it feels messy. It would be nice if execa could provide a clean, cross-platform API for this.
Maybe something like this:
const execa = require('execa');
const child = execa('./something');
// ...
child.killTree().then(() => {
console.log('all dead!');
});