Commits on Jan 15, 2019

1. feat: avoid hardcoded HOME for spawn-wrap working dir …

   By default, spawn-wrap writes temporary files to HOME.
   It used to be /tmp, but it changed that to HOME to support
   environments that have 'noexec' flags set on their tmpfs mount.
   Ref istanbuljs/spawn-wrap#3.
   
   The problem with this is that nyc now no longer works in environments
   without a (writable) home directory (e.g. the 'nobody' user on
   Linux).
   
   While it is fine to fallback to HOME, it should write elsewhere
   if that is unavailable, and ideally in a way that doesn't require
   every sysadmin or end-user to hardcode some environment variable
   in their package.json specifically for nyc or spawn-wrap.
   
   A common way to communicate this intent is with the XDG_CACHE_HOME
   environment variable.
   
   Fixes istanbuljs#951.

   

   Krinkle committed Jan 15, 2019
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