Child process errors should reject the promise right away #270
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With #157 and #199 we had the following issue: the top-level promise would not be rejected right away when timing out. It would instead wait for stdout/stderr streams to close first.
We fixed this, but the same problem is still happening with child process errors. If a child process receives an
errorevent, we should reject the promise right away, and not wait for stdout/stderr streams to close first (which might never happen when using a long-running command).This PR fixes this. As an added bonus, it improves the deferred pattern introduced by #199 that @sindresorhus was warning against.