Kill tree (all sub-processes)

[borekb]

Typical use case is starting a process with multiple sub-processes and then wanting to killing them all:

const child = require('child_process').exec("node -e 'while (true);'");
child.kill(); // will not work

It's been implemented for Windows in #20, would be nice to have this functionality cross-platform.

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[borekb]

Some packages to possibly draw inspiration from:

• kill-process
• tree-kill
• ps-tree

(I'm actually on Windows so cannot help testing this on Mac / Linux but these are the resources I've found.)

[simonepri]

I would also suggest pidtree.
ps-tree actually does not gives you all the sub-processes.

Anyway tree-kill seems more suited for this job.
Instead we can use it inside the fkill-cli package to show to the users which other processes will be killed.

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[sindresorhus]

If anyone wants to work on this, see the initial attempt and feedback in #34.